Dissection 5 - The Orbit

Abducent n.

What CN pierces the medial side of the lateral rectus m.?

Annular ring

Tendinous ring around optic n. where all 4 rectus muscles originate from

Ciliary ganglion; 5

Where para/pre from CN III synapse before going to ciliary m. and/or sphinctor pupillae (include number in attached image)

Conjunctiva

Transparent membrane covering the inner portion of the eyelid and sclera

Cribiform plate

Part of ethmoid plate on the medial side of the orbit

Frontal n.; 2

Branch of CN V1 that branches into supraorbital and supratrochelar n. (include number in attached image)

Infraorbital groove

Path for infraorbital n. (CN V2) to travel through on the floor of the orbit before exiting the infraorbital foramen

Infraorbital foramen

What hole does the infraorbital VAN pass through?

Inferior orbital fissure

What opening does the zygomatic n. and infraorbital VAN pass through to enter the orbit?

Inferior oblique m.

Eye muscle innervated by CN III; Elevation and ABduction

Inferior rectus m.

Eye muscle innervated by CN III; Depression and ADduction

Iris

Colored part around pupil

Lacrimal caruncle

On the medial corner of the eye (can be seen anteriorly)

Lacrimal gland

On the lateral upper corner of the eye; SS from CN V1 and Para from CN VII

Lacrimal n.

What n. is labeled 15?

Lateral rectus m.

Eye muscle innervated by CN VI; ABduction

Lesser wing of sphenoid

What is the green colored bone?

Levator palpebrae superioris; 5

Innervated by CN III involved in raising eyelid; Located just below the frontal n. (Include number in diagram)

Long ciliary n.

Branch of nasociliary n. (3 in photo)

Maxilla

What bone contributes to the floor of the orbit

Medial rectus m.

Eye muscle innervated by CN III; ADDuction

Nasociliary n.; 2

Most medial branch of CN V1 (include number from diagram)

Nasolacrimal canal

What connects the orbit to the nasal cavity?

Occulomotor n. (CN III)

What nerve innervates 3 of the 4 rectus m. and carries SM and Para/pre

Ophthalmic a.

Branch of ICA that enters orbit with CN II (1 in image)

Optic n.

Travels through optic canal and carries SSA vision

Orbicularis oculi

M. of facial expression that allows for forceful blinking

Orbital plate of the frontal

What contributes to the roof of the orbit?

Periorbital membrane

What lays just below the bony roof of the orbit

Sclera

What is the whites of the eye?

Short ciliary n.

What n. branch from the ciliary ganglion? (4 in image)

Superior oblique m.

Goes through trochela before attaching tho the eye; Depression and ABduction; Innervated by CN IV

Superior ophthalmic v.

______ → Cavernous sinus

Superior orbital fissure

CN III, IV, V1, and VI enter orbit while superior orbital v. exits orbit

Superior rectus m.; 12

Eye muscle innervated by CN III; Elevation and ADduction (include number in image)

Supraorbital n.

What nerve is 3?

Supraorbital foramen/notch

Where does the supraorbital VAN exit?

Supratrochlear n.

What n. is 4?

Trochlea

Fibrocartilagenous sling that the superior oblique m. passes before attaching to the eye

Trochlear n.

What n. innervates superior oblique m.?

Zygomatic

What makes up the lateral wall of the orbit?