The Orbit

Question 1

Why is there a lot of fat surrounding the retina and optic nerve

Answer 1

To keep it warm

Question 2

What 2 structures enter through the optic canal

Answer 2

Optic nerve

Ophthalmic artery

Question 3

What 3 nerves enter through the superior orbital fissure within the tendinous ring

Answer 3

CN 3
CN 6
Nasociliary nerve

Question 4

What 3 nerves enter through the superior orbital fissure (not within the tendinous ring)

Answer 4

CN 4
Lacrimal nerve
Frontal nerve

Question 5

What 2 nerves enter through the inferior orbital fissure

Answer 5

Infraorbital nerve

Zygomatic nerve

Question 6

Ophthalmic artery branches off the…

Answer 6

Internal carotid artery

Question 7

3 branches of trigeminal nerve

Answer 7

V1: ophthalmic
V2: maxillary
V3: mandibular

Question 8

3 branches of V1

Answer 8

Frontal nerve
Lacrimal nerve
Nasociliary nerve

Question 9

What spinal level does sympathetic innervation of the eye come from?

Answer 9

T1

Question 10

Path of sympathetic innervation from spine to eye muscle

Answer 10

Leaves T1 in anterior horn
Travels up sympathetic chain
Synapses in superior cervical ganglion
Travels in carotid plexus with the internal carotid artery
Jumps on the ophthalmic artery (V1)
Goes down long ciliary nerve
Innervates the dilator pupillae muscle

Question 11

Ciliary ganglion

Answer 11

Parasympathetic ganglion (fibers from CN 3)
Sympathetic and sensory fibers do pass through

Question 12

Where is the lacrimal gland in relation to the eye?

Answer 12

Lateral and superior