Optic Nerve And Orbital Anatomy: Structure, Branches, And Function

Optic Nerve And Orbital Anatomy: Structure, Branches, And Function

Question 1. Orbital nerve
Answer:

• It is a branch of Pterygopalatine nerve
• A branch of Maxillary nerve given in the Pterygopalatine ganglion
• By means of inferior orbital fissure, it supplies

1. 1. Periosteum of orbit
   2. Posterior ethmoid cells
   3. Orbitalis muscle
   4. Sphenoid sinus

Question 2. Maxillary sinus
Answer:

Maxillary Sinus:

• It is largest of all sinuses
• It lies in the body of maxilla

Maxillary Sinus Opening:

• It opens into middle meatus of nose in the lower part of the hiatus semilunaris
• A second opening is present at the posterior end of hiatus

Question 3. Lymphatic drainage of nasal septum
Answer:

Question 4. Hiatus semilunaris
Answer:

• It is a deep semicircular sulcus below the bulla
• Openings present are
  • Opening of frontal sinus – in anterior part
  • Opening of maxillary sinus – in posterior part
  • Opening of anterior ethmoidal sinus – behind frontal sinus
• Bounded by
  • Inferior and anterior – concave margin of unicate process of ethmoid bone
  • Superior ethmoidal bulla
  • Posterior – inferior nasal concha

Question 5. Give the nerve supply of nasal cavity.
Answer:

1. General sensory nerves Part:

2. Special sensory nerves:

• Olfactory nerve carries sensory sensation.