Introduction to the NS (Physiology) Flashcards
What are the contents of the orbit?
Contents (including adipose tissue)
Eyeball
Eyelids and lacrimal apparatus
Muscles
What is the cornea?
Transparent anterior continuation of the sclera
Eyeball
Is the sclera transparent?
No
Its opaque
Which part of the eyeball gives the eye its colour?
Iris
Which part of the eye contains rods and cones?
Retina
Which part of the eyeball has the ability to change shape?
Crystallin lens
What are the 2 types of liquids found in the eye?
AH
VH
What are the 5 layers of the cornea?
Epithelium Bowmans membrane Stroma Descemets layer Endothelium
Describe the stroma of the cornea
Regularly arranged
No blood vessels
Transparent
What is descemets layer of the cornea?
Basement layer of endothelium
What is bowman’s membrane?
Basement membrane of the epithelium
How is the transparency of the cornea maintained?
Regular arrangement of collagen
No blood vessels
Endothelial layer pump to keep AH out
What fluid does the anterior segment of the eye contain?
AH
What is the fovea centralis?
Area packed with cones s provides maximum visual acuity
What is the optic disc
The optic disc or optic nerve head is the point of exit for ganglion cell axons leaving the eye.
What structure suspends the biconvex lens of the eye?
Zonules
What is lens opacification known as?
Cataract
Where is the lacrimal gland located?
Superiolateral to the eye
What is the function of tear?
Keeps cornea moist
Washes away any particulate foreign bodies
What can you clinically stain with to see the tear film?
Fluorescein
Embryologically where do optic vesicles grow outwards from?
Diencephalic part of the neural tube
