AMP 2 lab exam The Peripheral nervous system

AMP 2 lab exam The Peripheral nervous system

Optic nerves

Sensory tracts that connect the retina of the posterior eyeball to brains sensory tract for visual signals, the optic nerve

Sclera

opaque; forms the bulk of the fibrous tunic

Cornea

Clear; Allows light to enter the eye

Fibrous tunic

Outermost protective layer of the eye. Composed of avascular (no blood vessels) connective tissue. (Sclera and the cornea)

Vascular tunic

Middle tunic; contains blood vessels. Choroid, ciliary body, ciliary processes, iris and pupil.

Choroid

Contains pigment that prevents scattering of light

Ciliary body

Composed of ciliary muscle that controls lens shape

Ciliary processes

Secretes aqueous humor

Iris

Pigmented, giving the eye its color

Pupil

Rounded opening that light comes through and regulates the amount of light that enters the eye.

Extrinsic eye muscle

6 muscles that voluntarily move the eye

Aqueous humor

The fluid that fills the anterior chamber of the eye

Sensory Tunic

Innermost tunic; forms the two layered retina.

Pigmented epithelial layer (tunic)

Lines vascular tunic

Neural layer (tunic)

Contains photoreceptors (transduce light energy into electrical anergy). Rods: Sensitive for dim/low-level light vision; Cones: Good for acuity in vision

Tapetum lucidum

An additional tissue in the cow eye. It allows light that has passed through the retina to reflect back, thus increasing the brightness of the image produced

Vitreous humor

Clear gel like substance that fills the posterior chamber of the eye. Reinforces the eye