A&P Chapter 15: Special Senses (eyeball)
____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.
Where is the visual cortex located?
Occipital lobe of the cerebrum
The accessory structures of the eye include:
eyebrows, eyelids, conjunctiva, lacrimal apparatus & extrinsic eye muscles
Another name for eyelids
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.
The ____ ______ consists of the lacrimal gland & the ducts that drain excess lacrimal secretions into the nasal cavity.
Layers forming the the wall of the eyeball:
Inner layer (retina)
The outermost coat of the eye. It is composed of dense avascular connective tissue. It has two obviously different regions: the Sclera & the cornea.
forms the posterior portion & the bulk of the fibrous layer, it is glistening white & opaque.
The anterior sixth of the fibrous layer is modified to form the transparent______.
The cornea is covered by
epithelial sheets on both faces.
The ____ ___ forms the middle coat of the eyeball.
Also call the uvea, this pigmented layer has 3 regions:
Choroid, ciliary body & iris
The choroid is a
blood vessel-rich, dark brown membrane that forms the posterior five-sixths of the vascular layer.
What is a blood vessel-rich, dark brown membrane that forms the posterior 5/6 of the vascular layer?
~Inner Layer (retina)~
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.