Nerves Of The Orbit

Nerves Of The Orbit

“What are the nerves of the orbit? A detailed question and answers guide”

Nerves of the orbit (or) Lateral rectus muscle of eyeball
Answer:

1. Lateral Rectus Muscle Of Eyeball Optic nerve:

• Lateral Rectus Muscle Of Eyeball Optic nerve is the nerve of sight
• Lateral Rectus Muscle Of Eyeball Optic nerve is made up of the axons of cells in the ganglionic layer of the retina
• Lateral Rectus Muscle Of Eyeball Optic nerve emerges from the eyeball 3 or 4 mm nasal to its posterior pole
• Lateral Rectus Muscle Of Eyeball Optic nerve is enclosed in three meningeal sheaths
• Lateral Rectus Muscle Of Eyeball Optic nerve cannot degenerate once it is cut

2. Lateral Rectus Muscle Of Eyeball Oculomotor nerve:

• Lateral Rectus Muscle Of Eyeball Oculomotor nerve is third cranial nerve
• Lateral Rectus Muscle Of Eyeball Oculomotor nerve  is distributed to the extraocular & intraocular muscles
• Functional components:
  • General somatic efferent
  • General visceral efferent
  • General somatic afferent

“Understanding the nerves of the orbit through FAQs: Composition, functions, and uses explained”

Optic nerve Nucleus:

• Optic nerve Nucleus is situated in the ventromedial part of central grey matter of midbrain at the level of superior colliculus

3. Trochlear nerve:

• Trochlear nerve is fourth cranial nerve
• Trochlear nerve supplies superior oblique muscle of the eyeball
• Functional components:
  • General somatic efferent
  • General somatic afferent

“Importance of studying nerves of the orbit for medical students: Questions explained”

Nucleus:

• Nucleus is situated in the ventromedial part of central grey matter of midbrain at the level of inferior colliculus

4. Abducent nerve:

• Abducent nerve  is sixth cranial nerve
• Abducent nerve supplies the lateral rectus muscle of the eyeball
• Abducent nerve Functional components:
  • General somatic efferent
  • General somatic afferent

Abducent nerve Nucleus:

Abducent nerve Nucleus is situated in the upper part of the floor of fourth ventricle in the lower pons

5. Branches of ophthalmic & maxillary divisions of the trigeminal nerve:

1. Branches of ophthalmic divisions:

“Common challenges in mastering nerves of the orbit notes effectively: FAQs provided”

• Branches of maxillary division:

1. Infraorbital nerve:
   • Infraorbital nerve enters the orbit through the inferior orbital fissure
     Branches:
     • Middle superior alveolar nerve
     • Anterior superior alveolar nerve
     • Terminal branchespalpebral, nasal & labial

Abducent nerve orbit course

1. Zygomatic nerve:
   • Zygomatic nerve enters the orbit through the lateral end of the inferior orbital fissure

Branches:

“Factors influencing success with nerves of the orbit studies: Q&A”

6. Sympathetic nerves:

• Arises from the internal carotid plexus
• Sympathetic nerves enter the orbit through
  • Ophthalmic nerve
  • Nasociliary nerve
  • Long Ciliary branches
  • Plexus surrounding ophthalmic artery
  • Direct branch from internal carotid plexus
  • Oculomotor, Trochlear, Abducent & ophthalmic nerves