Special Senses Part 2 - The eye Flashcards
What are the 4 walls of the bony orbit?
Superior
Inferior
Lateral
Medial
Label the parts of the bony orbit?
What are the accessory structures of the eye?
Eyebrows
Eyelashes
Eyelids
Extrinsic muscles that move the eyeballs
Lacrimal apparatus
Label the basic eye features?
What is the process of the ‘tear system’ (lacrimal apparatus)?
Identify the extraocular muscles?
Identify the layers of the eyeball?
What is the fibrous layer (fibrous tunic) of the eye & what does it contain?
–> Is the outer coat of the eyeball.
–> Contains anterior cornea & the posterior sclera.
What is the function of the cornea and the sclera?
Cornea:
Transmits and refracts incoming light.
Sclera:
Supports eye shape and protects it.
What is ‘conjunctiva’ and what surface does it cover?
It is an epithelial layer which covers the sclera.
What is the vascular tunic?
–> The middle layer of the eyeball.
–> Composed of the choroid, ciliary body, and iris.
What is the choroid?
A thin membrane that lines most of the internal surface of the sclera.
What is the function of the choroid?
Supplies nourishment to the retina.
What does the ciliary body consist of?
–> Consists of the ciliary processes (folds on the inner surface of the body whose capillaries secrete a aqueous humor fluid).
–> Consists the ciliary muscle (a smooth muscle that alters the shape of the lens for viewing objects close up or at a distance).
What are the 2 functions of the lens?
- A transparent structure that focuses light rays onto the retina.
- Contains zonular fibers or suspensory ligaments which attach the lens to the ciliary muscle and hold the lens in position.