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A&P: Chapter 13: Sensory System

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Contains the radial muscle and Circular Muscles


Nerve that carries information from the photoreceptors to the primary visual cortex

Optic Nerve

Cranial Nerve II

Optic Nerve

Sensory Nerve For Vision

Optic Nerve

Muscle that raises the eyelid

Levator Palpebra Superioris

Location of the pimrary visual cortex

Occipital Lobe

Elevated intracranial pressure compresses this nerve to cause ptosis of the eyelid

Oculomotor Nerve

Muslce that move the eyeball in its socket

Extrinsic Eye Muscles

The Meaning of 4 in LR8SO4

Trochlear Nerve

The Meaning of 6 in LR6SO4


The structures indicated by LR and SO in LR6SO4

Lateral Rectus and Superioir Oblique

Elevated intracranial pressure compresses this nerve to cause fixed and dialated pupils

Radial Muscle

Muscle that contracts and relaxes to change the shape of the lense

Ciliary Muscle

Contraction of this muscle widens the pupil

Radial Muscle

Contains the muscles that cause mydriasis and miosis

Circular Muscle

Includes the superior inferior medial and lateral rectus also includes the supererioir and inferior oblique.

Extinsic Eye Muscles

Muscles that allow you to look at the ceiling without moving your head

Extrinsic Eye Muscles

Anterioir extension of the sclera; this avascular structure allows light to enter the eye


Outermost layer or Tunic of the eyeball


Called the "window of the eye" because it is the first structure through which light enters the eye


Colored portion of the eye


Middle tunic; has a rich supply of blood and nourishes the retina


The shape of this structure changes in response to contraction and relaxation of the ciliary muscles; it refracts light waves


Venous sinus that drains aqueous humor

Canal of Schlemm

Contact lenses are placed on this surface


Layer that extends anterioirly to form the iliary body and the iris to form the ciliary body and the iris


Innermost tunic; it is the nervous tissue that contains the photoreceptors


The Fluid that helps maintain the shape of the anterioir cavity

Aqueous Humor

Layer that contains the rods and cones


Circular opening in the center of the iris


Blinde Spot

Optic Disc

Fluid that is formed by the ciliary body and drains through the canal of schlemm

Aqueous Humor

Ciliary muscles attach to these bands of connective tissue that pull on the lens

suspensory ligaments

mucous membrane that lines the inner surface of the eyelids and folds back to cover a part of the anterioir surface of the eeball


Layer that includse the macula lutea and fovea centralis


Gel Like substance that fills the posterior cavity

Vitrous Humor

Structure that secretes squeous humor and gives rise to intrinsic eye muscles called the ciliary muscles

Ciliary Body

Composed of muscles that determine the size of the pupil


Layer that sends information along the optic nerve to the occipital lobe


Gel Like fluid that gently pushes the retina against the choroid

vitreous humor

Layer that contains melanocytes to diminish glare as light enters the posterioir cavity