A&P Chapter 15: Special Senses (eyeball)

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1

____is our dominant sense: Some 70% of all the sensory receptors in the body are in the eyes & nearly half of the cerebral cortex is involved in some aspect of visual processing.

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Vison

2

Where is the visual cortex located?

Occipital lobe of the cerebrum

3

The accessory structures of the eye include:

eyebrows, eyelids, conjunctiva, lacrimal apparatus & extrinsic eye muscles

4

Another name for eyelids

Palpebrae

5

The _____is a transparent mucous membrane. It lines the eyelids as the palpebral cunjunctiva & reflects over the anterior surface of the eyeball as the bulbar conjunctiva.

Cunjunctiva

6

The ____ ______ consists of the lacrimal gland & the ducts that drain excess lacrimal secretions into the nasal cavity.

lacrimal apparatus

7

Layers forming the the wall of the eyeball:

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Fibrous layer
Vasular Layer
Inner layer (retina)

8

Fibrous layer

The outermost coat of the eye. It is composed of dense avascular connective tissue. It has two obviously different regions: the Sclera & the cornea.

9

Sclera

forms the posterior portion & the bulk of the fibrous layer, it is glistening white & opaque.

10

The anterior sixth of the fibrous layer is modified to form the transparent______.

cornea

11

The cornea is covered by

epithelial sheets on both faces.

12

The ____ ___ forms the middle coat of the eyeball.

Vascular layer

13

~Vascular layer~
Also call the uvea, this pigmented layer has 3 regions:

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Choroid, ciliary body & iris

14

The choroid is a

blood vessel-rich, dark brown membrane that forms the posterior five-sixths of the vascular layer.

15

What is a blood vessel-rich, dark brown membrane that forms the posterior 5/6 of the vascular layer?

Choroid

16

~Inner Layer (retina)~

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The innermost layer of the eyeball is the delicate, two-layered retina. Its outer pigmented layer, a single cell thick lining, abuts the choroid & extends anteriorly to cover the ciliary body & the posterior face of the iris.