{"id":6027,"date":"2023-07-26T09:54:28","date_gmt":"2023-07-26T09:54:28","guid":{"rendered":"https:\/\/bdsnotes.com\/?p=6027"},"modified":"2024-06-12T09:46:53","modified_gmt":"2024-06-12T09:46:53","slug":"contents-of-the-orbit-short-question-and-answers","status":"publish","type":"post","link":"https:\/\/bdsnotes.com\/contents-of-the-orbit-short-question-and-answers\/","title":{"rendered":"Contents of The Orbit Short Question And Answers"},"content":{"rendered":"<p><strong>Question 1. Write about origin, innervations, action of muscles of eyeball (or) Extraocular muscles. (or) Oblique muscle of eyeball (or) Action of oblique muscle of eyeball<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><strong>Muscles of Eyeball:<\/strong><\/p>\n<p><strong>1. Involuntary muscles:<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6030\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-involuntary-muscles.png\" alt=\"Contents Of The Orbit involuntary muscles\" width=\"624\" height=\"246\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-involuntary-muscles.png 624w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-involuntary-muscles-300x118.png 300w\" sizes=\"(max-width: 624px) 100vw, 624px\" \/><\/p>\n<p><strong>Read And Learn More: <a href=\"https:\/\/bdsnotes.com\/bds-previous-examination-question-and-answers\/\">BDS Previous Examination Question And Answers<\/a><\/strong><\/p>\n<p><strong>2. Voluntary muscles:<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6031\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-voluntary-muscles.png\" alt=\"Contents Of The Orbit voluntary muscles.\" width=\"799\" height=\"470\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-voluntary-muscles.png 799w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-voluntary-muscles-300x176.png 300w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-voluntary-muscles-768x452.png 768w\" sizes=\"(max-width: 799px) 100vw, 799px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6032\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-voluntary-muscles-1.png\" alt=\"Contents Of The Orbit voluntary muscles\" width=\"855\" height=\"636\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-voluntary-muscles-1.png 855w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-voluntary-muscles-1-300x223.png 300w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-voluntary-muscles-1-768x571.png 768w\" sizes=\"(max-width: 855px) 100vw, 855px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-12921\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/07\/Contents-Of-The-Orbit-apical-part-of-the-orbit-showing-the-origins-of-the-wxtraocular-musclese-wxtraocular.png\" alt=\"Contents Of The Orbit apical part of the orbit showing the origins of the wxtraocular muscles\" width=\"586\" height=\"311\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/07\/Contents-Of-The-Orbit-apical-part-of-the-orbit-showing-the-origins-of-the-wxtraocular-musclese-wxtraocular.png 586w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/07\/Contents-Of-The-Orbit-apical-part-of-the-orbit-showing-the-origins-of-the-wxtraocular-musclese-wxtraocular-300x159.png 300w\" sizes=\"(max-width: 586px) 100vw, 586px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-12922\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/07\/Contents-Of-The-Orbit-scheme-to-show-the-insertion-of-the-oblique-muscles-of-the-eyeball.png\" alt=\"Contents-Of-The-Orbit-scheme-to-show-the-insertion-of-the-oblique-muscles-of-the-eyeball\" width=\"457\" height=\"338\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/07\/Contents-Of-The-Orbit-scheme-to-show-the-insertion-of-the-oblique-muscles-of-the-eyeball.png 457w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/07\/Contents-Of-The-Orbit-scheme-to-show-the-insertion-of-the-oblique-muscles-of-the-eyeball-300x222.png 300w\" sizes=\"(max-width: 457px) 100vw, 457px\" \/><\/p>\n<p><strong>Muscles of Eyeball Applied anatomy:<\/strong><\/p>\n<ul>\n<li>Paralysis of muscles of eyeball causes various symptoms<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6035\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-applied-anatomy.png\" alt=\"Contents Of The Orbit applied anatomy\" width=\"483\" height=\"292\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-applied-anatomy.png 483w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-applied-anatomy-300x181.png 300w\" sizes=\"(max-width: 483px) 100vw, 483px\" \/><\/p>\n<p><strong>Question 2. Nerves of the orbit (or) Lateral rectus muscle of eyeball<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><strong>1. Lateral Rectus Muscle Of Eyeball Optic nerve:<\/strong><\/p>\n<ul>\n<li><strong>Lateral Rectus Muscle Of Eyeball Optic nerve<\/strong> is the nerve of sight<\/li>\n<li><strong>Lateral Rectus Muscle Of Eyeball Optic nerve<\/strong>\u00a0is made up of the axons of cells in the ganglionic layer of the retina<\/li>\n<li><strong>Lateral Rectus Muscle Of Eyeball Optic nerve<\/strong>\u00a0emerges from the eyeball 3 or 4 mm nasal to its posterior pole<\/li>\n<li><strong>Lateral Rectus Muscle Of Eyeball Optic nerve<\/strong>\u00a0is enclosed in three meningeal sheaths<\/li>\n<li><strong>Lateral Rectus Muscle Of Eyeball Optic nerve<\/strong>\u00a0cannot degenerate once it is cut<\/li>\n<\/ul>\n<p><strong>2. Lateral Rectus Muscle Of Eyeball Oculomotor nerve:<\/strong><\/p>\n<ul>\n<li><strong>Lateral Rectus Muscle Of Eyeball Oculomotor nerve<\/strong> is third cranial nerve<\/li>\n<li><strong>Lateral Rectus Muscle Of Eyeball Oculomotor nerve<\/strong>\u00a0 is distributed to the extraocular &amp; intraocular muscles<\/li>\n<li><strong>Functional components:<\/strong>\n<ul>\n<li>General somatic efferent<\/li>\n<li>General visceral efferent<\/li>\n<li>General somatic afferent<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Optic nerve Nucleus:<\/strong><\/p>\n<ul>\n<li><strong>Optic nerve Nucleus<\/strong>\u00a0is situated in the ventromedial part of central grey matter of midbrain at the level of superior colliculus<\/li>\n<\/ul>\n<p><strong>3. Trochlear nerve:<\/strong><\/p>\n<ul>\n<li><strong>Trochlear nerve<\/strong>\u00a0is fourth cranial nerve<\/li>\n<li><strong>Trochlear nerve<\/strong>\u00a0supplies superior oblique muscle of the eyeball<\/li>\n<li><strong>Functional components:<\/strong>\n<ul>\n<li>General somatic efferent<\/li>\n<li>General somatic afferent<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Nucleus:<\/strong><\/p>\n<ul>\n<li><strong>Nucleus<\/strong>\u00a0is situated in the ventromedial part of central grey matter of midbrain at the level of inferior colliculus<\/li>\n<\/ul>\n<p><strong>4. Abducent nerve:<\/strong><\/p>\n<ul>\n<li><strong>Abducent nerve<\/strong>\u00a0 is sixth cranial nerve<\/li>\n<li><strong>Abducent nerve<\/strong>\u00a0supplies the lateral rectus muscle of the eyeball<\/li>\n<li><strong>Abducent nerve Functional components:<\/strong>\n<ul>\n<li>General somatic efferent<\/li>\n<li>General somatic afferent<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Abducent nerve Nucleus:<\/strong><\/p>\n<p><strong>Abducent nerve Nucleus<\/strong>\u00a0is situated in the upper part of the floor of fourth ventricle in the lower pons<\/p>\n<p><strong>5. Branches of ophthalmic &amp; maxillary divisions of the trigeminal nerve:<\/strong><\/p>\n<ol>\n<li><strong>Branches of ophthalmic divisions:<\/strong><\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6036\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-branches-of-oplithalmic-divisions.png\" alt=\"Contents Of The Orbit branches of oplithalmic divisions\" width=\"645\" height=\"404\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-branches-of-oplithalmic-divisions.png 645w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-branches-of-oplithalmic-divisions-300x188.png 300w\" sizes=\"(max-width: 645px) 100vw, 645px\" \/><\/p>\n<ul>\n<li><strong>Branches of maxillary division:<\/strong><\/li>\n<\/ul>\n<ol>\n<li><strong>Infraorbital nerve:<\/strong>\n<ul>\n<li><strong>Infraorbital nerve<\/strong>\u00a0enters the orbit through the inferior orbital fissure<br \/>\n<strong>Branches:<\/strong><\/p>\n<ul>\n<li>Middle superior alveolar nerve<\/li>\n<li>Anterior superior alveolar nerve<\/li>\n<li>Terminal branchespalpebral, nasal &amp; labial<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><strong>Zygomatic nerve:<\/strong>\n<ul>\n<li><strong>Zygomatic nerve<\/strong>\u00a0enters the orbit through the lateral end of the inferior orbital fissure<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p><strong>Branches:<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6037\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-branches-of-structures-supplied.png\" alt=\"Contents Of The Orbit branches of structures supplied\" width=\"621\" height=\"222\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-branches-of-structures-supplied.png 621w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-branches-of-structures-supplied-300x107.png 300w\" sizes=\"(max-width: 621px) 100vw, 621px\" \/><\/p>\n<p><strong>6. Sympathetic nerves:<\/strong><\/p>\n<ul>\n<li>Arises from the internal carotid plexus<\/li>\n<li><strong>Sympathetic nerves<\/strong>\u00a0enter the orbit through\n<ul>\n<li>Ophthalmic nerve<\/li>\n<li>Nasociliary nerve<\/li>\n<li>Long Ciliary branches<\/li>\n<li>Plexus surrounding ophthalmic artery<\/li>\n<li>Direct branch from internal carotid plexus<\/li>\n<li>Oculomotor, Trochlear, Abducent &amp; ophthalmic nerves<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Question 3. Give the positions, connections &amp; branches of ciliary ganglion (or) Ciliary Ganglion<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><strong>Ciliary Ganglion Position:<\/strong><\/p>\n<ul>\n<li>Ciliary ganglion lies near the apex of the orbit between the optic nerve &amp; the tendons of the lateral rectus muscle<\/li>\n<li><strong>Ciliary Ganglion Position<\/strong>\u00a0is related to nasociliary nerve<\/li>\n<\/ul>\n<p><strong>Ciliary Ganglion Roots:<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6038\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-nasociliary-nerve-Roots.png\" alt=\"Contents Of The Orbit nasociliary nerve Roots\" width=\"832\" height=\"331\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-nasociliary-nerve-Roots.png 832w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-nasociliary-nerve-Roots-300x119.png 300w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-nasociliary-nerve-Roots-768x306.png 768w\" sizes=\"(max-width: 832px) 100vw, 832px\" \/><\/p>\n<p><strong>Ciliary Ganglion Branches:<\/strong><\/p>\n<ul>\n<li>The ganglion gives off 810 short Ciliary nerves which further divide into 1520 branches<\/li>\n<li><strong>Ciliary Ganglion Branches<\/strong>\u00a0also contains fibres from the roots of te ganglion<\/li>\n<\/ul>\n<p><strong>Ciliary Ganglion Actions of its branches:<\/strong><\/p>\n<ul>\n<li>Narrowing the size of pupil by supplying constrictor muscle<\/li>\n<li>Increasing the curvature of anterior surface of lens by supplying ciliaris muscle<\/li>\n<\/ul>\n<p><strong>Question 4. Vessels of the orbit<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><strong>1. Ophthalmic artery:<\/strong><\/p>\n<ul>\n<li><strong>Ophthalmic artery<\/strong>\u00a0is a branch of the cerebral part of the internal carotid artery<\/li>\n<li><strong>Ophthalmic artery<\/strong>\u00a0enters the orbit through the optic canal<\/li>\n<\/ul>\n<p><strong>Vessels of the orbit Branches:<\/strong><\/p>\n<ol>\n<li>Central artery of retina<\/li>\n<li>Branches arising from the lacrimal artery\n<ul>\n<li>Branches given to the lacrimal gland<\/li>\n<li>2 zygomatic branches<\/li>\n<li>Lateral palpebral branches supplying the eyelids<\/li>\n<li>A recurrent meningeal branch<\/li>\n<li>Muscular branches supplying muscles of orbit<\/li>\n<\/ul>\n<\/li>\n<li>Branches arising from the main trunk\n<ul>\n<li>Posterior ciliary arteries<\/li>\n<li>Supraorbital &amp; Supratrochlear<\/li>\n<li>Anterior &amp; posterior ethmoidal<\/li>\n<li>Medial palpebral<\/li>\n<li>Dorsal nasal<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p><strong>2. Ophthalmic veins:<\/strong><\/p>\n<ol>\n<li>Superior ophthalmic vein\n<ul>\n<li>Lies above the optic nerve<\/li>\n<li>Receives tributaries from branches of ophthalmic artery<\/li>\n<li>Drains into cavernous sinus<\/li>\n<\/ul>\n<\/li>\n<li>Inferior ophthalmic vein\n<ul>\n<li>Lies below the optic nerve<\/li>\n<li>Receives tributaries from the lacrimal sac, lower orbital muscles &amp; eyelids<\/li>\n<li>Joins superior ophthalmic vein<\/li>\n<li>Drains into cavernous sinus<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p><strong>3. Lymphatics:<\/strong><\/p>\n<ul>\n<li>Drains into preauricular parotid lymph node<\/li>\n<\/ul>\n<p><strong>Question 5. Ophthalmic artery<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><strong>Ophthalmic artery Origin:<\/strong><\/p>\n<ul>\n<li><strong>Ophthalmic artery Origin<\/strong> is a branch of the cerebral part of the internal carotid artery<\/li>\n<\/ul>\n<p><strong>Ophthalmic artery Course:<\/strong><\/p>\n<ul>\n<li>Ophthalmic Artery Course enters the orbit through the optic canal<\/li>\n<li>Pierces the dura mater<\/li>\n<li>Runs along the medial wall of orbit<\/li>\n<li>Terminates near the medial angle of the eye by dividing into the supratrochlear and dorsal nasal branches<\/li>\n<\/ul>\n<p><strong>Ophthalmic artery Branches:<\/strong><\/p>\n<p>1. Central artery of retina<\/p>\n<ol>\n<li>First and most important branch of ophthalmic artery<\/li>\n<\/ol>\n<p>2. Branches arising from the lacrimal artery<\/p>\n<ol>\n<li>Branches given to lacrimal gland<\/li>\n<li>Two zygomatic branches<\/li>\n<li>Lateral palpebral branches supplying the eyelids<\/li>\n<li>A recurrent meningeal branch<\/li>\n<li>Muscular branches supplying muscles of orbit<\/li>\n<\/ol>\n<p>3. Branches arising from the main trunk<\/p>\n<ol>\n<li>Posterior ciliary arteries<\/li>\n<li>Supraorbital and supratrochlear<\/li>\n<li>Anterior and posterior ethmoidal<\/li>\n<li>Medial palpebral<\/li>\n<li>Dorsal nasal<\/li>\n<\/ol>\n<p><strong>Ophthalmic artery Applied aspect:<\/strong><\/p>\n<ul>\n<li>Central artery of retina is only arterial supply to retina<\/li>\n<li>If it gets blocked then it leads to sudden blindness<\/li>\n<\/ul>\n<p><strong>Question 6. Extraocular muscles and their actions.<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6039\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-extra-ocular-muscles-and-their-actions.png\" alt=\"Contents Of The Orbit extra ocular muscles and their actions\" width=\"505\" height=\"600\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-extra-ocular-muscles-and-their-actions.png 505w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-extra-ocular-muscles-and-their-actions-253x300.png 253w\" sizes=\"(max-width: 505px) 100vw, 505px\" \/><\/p>\n<p><strong>Question 7. Nasociliary nerve. (or) Name branches of nasociliary nerve<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<ul>\n<li>Nasociliary is one of the terminal branches of the ophthalmic division of the trigeminal nerve<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6040\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-name-branches-of-nasociliary-nerve.png\" alt=\"Contents Of The Orbit name branches of nasociliary nerve\" width=\"698\" height=\"307\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-name-branches-of-nasociliary-nerve.png 698w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-name-branches-of-nasociliary-nerve-300x132.png 300w\" sizes=\"(max-width: 698px) 100vw, 698px\" \/><\/p>\n<p><strong>Question 8. Short ciliary nerve<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<ul>\n<li>The Postganglionic parasympathetic fibres from ciliary ganglion are distributed to the eyeball through the short ciliary nerves<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6041\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-short-ciliary-nerve.png\" alt=\"Contents Of The Orbit short ciliary nerve\" width=\"631\" height=\"153\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-short-ciliary-nerve.png 631w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-short-ciliary-nerve-300x73.png 300w\" sizes=\"(max-width: 631px) 100vw, 631px\" \/><\/p>\n<p><strong>Question 9. Fascial sheath of eyeball<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<ul>\n<li><strong>Fascial sheath of eyeball<\/strong>\u00a0is a layer of fascia that encloses a major part of eyeball<\/li>\n<li><strong>Fascial sheath of eyeball<\/strong>\u00a0is pierced by<\/li>\n<\/ul>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\n<li>Tendons of various extraocular muscle<\/li>\n<li>Ciliary vessels &amp; nerve\n<ul>\n<li>It gives off a number of expansions like\n<ol>\n<li>Tubular sheath<\/li>\n<li>Medial check ligament<\/li>\n<li>Lateral check ligament<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><strong>Fascial sheath of eyeball Extend:<\/strong><\/p>\n<ul>\n<li>From the optic nerve to the sclerocorneal junction<\/li>\n<\/ul>\n<p><strong>Fascial sheath of eyeball Attachments:<\/strong><\/p>\n<ul>\n<li>Posteriorly to sclera around the point of entrance of optic nerve<\/li>\n<li>Anteriorly to the sclera near the edge of cornea<\/li>\n<\/ul>\n<p><strong>Fascial sheath of eyeball Significance:<\/strong><\/p>\n<ul>\n<li>The eyeball can freely move within this sheath<\/li>\n<\/ul>\n<p><strong>Question 10. Extraocular muscles and their nerve supply<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6042\" src=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-extraocular-muscles-and-their-nerve-supply.png\" alt=\"Contents Of The Orbit extraocular muscles and their nerve supply\" width=\"598\" height=\"265\" srcset=\"https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-extraocular-muscles-and-their-nerve-supply.png 598w, https:\/\/bdsnotes.com\/wp-content\/uploads\/2023\/06\/Contents-Of-The-Orbit-extraocular-muscles-and-their-nerve-supply-300x133.png 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><\/p>\n<p><strong>Question 11. Nerve supply and actions of superior oblique<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><strong>Superior Oblique Muscle of Eyeball:<\/strong><\/p>\n<ul>\n<li><strong>Superior Oblique Muscle of Eyeball<\/strong>\u00a0is voluntary muscle of eyeball<\/li>\n<\/ul>\n<p><strong>superior oblique Nerve Supply:<\/strong><\/p>\n<ul>\n<li><strong>superior oblique Nerve Supply<\/strong>\u00a0is supplied by trochlear nerve<\/li>\n<\/ul>\n<p><strong>superior oblique Actions:<\/strong><\/p>\n<ul>\n<li>Depresses eyeball<\/li>\n<li>Abduction of eyeball<\/li>\n<li>Intortion of eyeball<\/li>\n<\/ul>\n<p><strong>Question 12. Infraorbital nerve<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<ul>\n<li><strong>Infraorbital nerve<\/strong>\u00a0is branch of ophthalmic division of trigeminal nerve<\/li>\n<li><strong>Infraorbital nerve<\/strong>\u00a0enters the orbit through the inferior orbital fissure<\/li>\n<\/ul>\n<p><strong> Infraorbital nerve Branches:<\/strong><\/p>\n<ul>\n<li>Middle superior alveolar nerve<\/li>\n<li>Anterior superior alveolar nerve<\/li>\n<li>Terminal branches palpebral, nasal and labial<\/li>\n<\/ul>\n<p><strong>Question 13. Superior rectus muscle of eyeball and it&#8217;s action<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<ul>\n<li><strong>Superior rectus muscle of eyeball<\/strong>\u00a0is an extraocular muscle of orbit<\/li>\n<li><strong>Superior rectus muscle of eyeball<\/strong>\u00a0has origin in the back of the orbit in a fibrous ring called the annulus of Zinn.<\/li>\n<li>This ring is attached to the orbital surface of the apex of the orbit.<\/li>\n<li>The fibres are inserted into the sclera posterior to the limbus<\/li>\n<li><strong>Superior rectus muscle of eyeball<\/strong>\u00a0is supplied by the superior branch of oculomotor nerve.<\/li>\n<\/ul>\n<p><strong>Superior rectus muscle of eyeball\u00a0 Actions:<\/strong><\/p>\n<ul>\n<li>Elevation<\/li>\n<li>Adduction<\/li>\n<li>Intortion<\/li>\n<\/ul>\n<p><strong>Superior rectus muscle of eyeball Applied anatomy:<\/strong><\/p>\n<ul>\n<li><strong>Superior rectus muscle of eyeball<\/strong>\u00a0is the only muscle that is capable of elevating the pupil when it is in a fully abducted position.<\/li>\n<\/ul>\n<p><strong>Question 14. Optic canal<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<ul>\n<li>Optic canal leads to the orbit<\/li>\n<li><strong>Optic canal<\/strong>\u00a0is bounded\n<ul>\n<li>Laterally by lesser wing of sphenoid<\/li>\n<li>Front and behind by the two roots of the lesser wing<\/li>\n<li>Medially by the body of sphenoparietal<\/li>\n<\/ul>\n<\/li>\n<li>Structures passing through it are:\n<ul>\n<li>Optic nerve<\/li>\n<li>Ophthalmic artery.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Question 15. Functional components of oculomotor nerve.<\/strong><br \/>\n<strong>Answer:<\/strong><\/p>\n<p><strong>Functional components of oculomotor nerve are:<\/strong><\/p>\n<ul>\n<li>General somatic efferent<\/li>\n<li>General visceral efferent<\/li>\n<li>General somatic afferent<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Question 1. Write about origin, innervations, action of muscles of eyeball (or) Extraocular muscles. (or) Oblique muscle of eyeball (or) Action of oblique muscle of eyeball Answer: Muscles of Eyeball: 1. Involuntary muscles: Read And Learn More: BDS Previous Examination Question And Answers 2. Voluntary muscles: &nbsp; Muscles of Eyeball Applied anatomy: Paralysis of muscles [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[16],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Contents of The Orbit Short Question And Answers - BDS Notes<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bdsnotes.com\/contents-of-the-orbit-short-question-and-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contents of The Orbit Short Question And Answers - BDS Notes\" \/>\n<meta property=\"og:description\" content=\"Question 1. 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