Ear And Orbit Head And Neck Question And Answers

Orbit

Question 1. Enumerate the structures present in the orbit.
Answer.

These are:

Eyeball
Extrinsic muscles of eyeball
- Four recti
  - Superior rectus (SR)
  - Inferior rectus (IR)
  - Medial rectus (MR)
  - Lateral rectus (LR)
- Two obliques
  - Superior oblique (SO)
  - Inferior oblique (IO)
Levator palpebrae superioris muscle
Nerves
- Optic nerve
- Three divisions of ophthalmic nerve:
  - Nasociliary
  - Lacrimal
  - Frontal
- Three motor nerves:
  - Oculomotor (upper and lower divisions; CN 3)
  - Trochlear (CN 4)
  - Abducent (CN 6)
Ciliary ganglion
Ophthalmic artery
Ophthalmic veins
Lacrimal gland
Orbital pad of fat