Anatomy Lab 1 - Cow Eye Dissection

Retractor bulbi muscle

makes a circular eyeball insertion

Humans do not have this muscle; it pulls the cow eye back into the orbit

What is the optic nerve surrounded by?

A white sheath of dura

What parts of the eye are a part of the fibrous/outer tunic?

Cornea and sclera

What is the pigmented membrane near the corneal edge?

Conjunctiva

Which structure is a part of the vascular/middle tunic?

Iris

pupil (slit-like, artifact)

choroid (black)

ciliary body

How does the cornea look?

Clouded

Which type of cut did we perform?

Coronal: cut into anterior and posterior half

Tapetum lucidum

Iridescent, makes the eyes shine at night

Part of the choroid

increases the amount of light that is received at night by the retina

What structure is a part of the inner tunic?

Retina - creamy white membrane contacting the vitreous

Hole in retina is the injection hole (cows do not have a fovea)

Ora seratta

What the retina is called where the creamy retina ends anteriorly, close to the iris

Optic disc

Retina is attached here

Where does the vitreous attach to anteriorly?

The ciliary body

What attaches the lens to the ciliary body

Zonules/suspensory ligaments

Posterior chamber

Mostly between lens and iris

Includes zonules

If eye was living, aqueous would be here

Where does the posterior chamber become the anterior chamber?

the pupil

What is the anterior chamber?

the space between the posterior surface of cornea and anterior surface of iris

it contains aqueous

The angle of anterior chamber is the peripheral edge of the chamber (drainage area for aqueous)

What structure is the ciliary body continuous with?

The iris

Lens capsule

Maintains its transparency but not elasticity