LAB Orbital Contents

Question 0

What muscle does the Trochlear nerve (CN IV) control?

Answer 0

The superior oblique

Question 1

What eye muscle do the abducens control?

Answer 1

Lateral Rectus

Question 2

What two muscles are controlled by the sympathetic nervous system?

Answer 2

Dilator pupillae muscle

Superior tarsal muscle

Question 3

What muscles of the eye are innervated by CN III parasympathetically?

Answer 3

Sphincter pupillae muscle

Ciliary muscle

Question 4

Where do the Opthalmic veins drain?

Answer 4

Either the sphenoparietal sinus or the cavernous sinus

Question 5

What is the periorbita?

Answer 5

The periosteal layer of the bone that lines the orbit

Question 6

What muscle controls the shape of the lens?

Answer 6

The ciliary muscle (CN III)

Question 7

What envelopes the eye?

Answer 7

The bulbar sheath or fascia

Called Tenon’s capsule

Question 8

What are the three divisions of the Opthalmic nerve V1 sensory nerve from medial to lateral?

Answer 8

Nasociliary nerve

Frontal nerve (branches into the supratrochlear and supraorbital nerve)

Lacrimal nerve

Question 9

What does the lacrimal nerve serve?

Answer 9

Upper eyelid and upper forehead

Question 10

What does the nasociliary nerve serve?

Answer 10

Nasal cavity
Eyeball
Tip of nose

Question 11

What does the levator palpebrae superioris do?

Answer 11

Elevates the eyelid

Innervated by CN III

Question 12

What is the superior tarsal muscle (Mullers muscle)?

Answer 12

Smooth muscle that elevates the eyelid

Sympathetic neurons

Question 13

Where are the cell bodies that control the superior tarsal muscle?

Answer 13

The superior cervical ganglion

Question 14

Hat nerves branch off of the nasociliary nerve?

Answer 14

The anterior and posterior ethmodial nerves

The long ciliary nerve

Question 15

What is the Opthalmic artery a branch of?

Answer 15

The internal carotid

Passes with the optic nerve

Question 16

What ganglion is located on the optic tract and what type of fibers are in it?

Answer 16

The ciliary ganglia of the optic nerve

Carries parasympathetic nerve

Question 17

What is the only eye muscle that doesn’t originate from the annular ring?

Answer 17

The inferior oblique which takes origin from maxilla

Question 18

What structures pass through the superior orbital fissure?

Answer 18

Abducens
Occularmotor
Superior Opthalmic vein
Trochlear nerve

Question 19

What nerve does not pass through the superior orbital fissure?

Answer 19

The optic nerve

Question 20

What is the optic nerve supplied by?

Answer 20

The central artery of the retina

Question 21

What is the trochlea?

Answer 21

The pulley through which the superior oblique muscle passes before it connects to the eyeball

Question 22

How does Horner syndrome happen?

Answer 22

Results from interruption of the sympathetic pathways on the ipsilateral side of either the:

1. Cervical sympathetic trunk
2. Sympathetic fibers in the spinal cord and brainstem

Question 23

How does Horner syndrome present?

Answer 23

Ptosis - drooping of the eyelid
Miosis - pupillary constriction
Anhidrosis - absence of sweating
Flushing of the face (vasodilation)

Question 24

What is the pterygopalatine ganglion?

Answer 24

A part of the facial nerve
Has post-ganglionic cell bodies
Lacrimal gland

Question 25

Where does the ciliary ganglion come from and go?

Answer 25

The occularmotor nerve

Parasympathetic innervation of the sphincter muscles and the ciliary muscle

Question 26

Where are the sensory nerve cell bodies located for those neurons that provide general sensation for the eye?

Answer 26

In the trigeminal ganglion