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A&P 2 Lab pgs24-32
spinal cord, eyes
36
Anatomy
Undergraduate 1
03/14/2013

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Term
ventral median fissure
Definition
prominent deep ventral groove of spinal cord
Term
dorsal sulcus
Definition
slight, median depression on dorsal aspect of spinal cord
Term
central canal (spinal canal)
Definition
canal inside the vertebrae which contains the spinal cord
Term
dorsal horn of gray matter
Definition
posterior column or sensory horn of gray matter; sensory neurons begin here
Term
ventral horn of gray matter
Definition
anterior column or motor horn of gray matter; motor neurons begin here
Term
dorsal (posterior) funiculi
Definition
white matter between the two dorsal horns of gray matter
Term
lateral funiculi
Definition
right and left white matter between 2 dorsal and ventral roots
Term
ventral (anterior) funiculi
Definition
white matter between the 2 ventral and anterior roots
Term
sclera
Definition
whitish colored in life; part of the eye to which the extrinsic eye muscles are attached; hard
Term
cornea
Definition
front part of the eye; clear in life
Term
fibrous tunic
Definition
sclera and cornea combined; maintains the general shape of the eye
Term
vascular tunic
Definition
middle, dark layer of the eye; highly pigmented and rich in blood vessels; povides proper nutrition to the retina
Term
choroid
Definition
posterior portion of the vascular tunic; dark and extensive
Term
iris
Definition
represents an anterior portion of the vascular tunic; also receives contributions from the pigmented retina
Term
pupil
Definition
hole in the middle of the iris
Term
ciliary body
Definition
represents the anterior portion of the vascular tunic; also receives contributions from the pigmented retina; contains intrinsic ciliary muscles; pleated in appearance when viewed from behind; controls lens shape
Term
suspensory ligament
Definition
portion of the anterior vascular tunic; suspends the lens
Term
sensory retina
Definition
innermost layer of the eye; the visual receptor or nervous portion of the eye
Term
internal tunic
Definition
innermost layer of the eye; mainly composed of the retina
Term
fovea centralis
Definition
portion of the retina with the highest accuity; has many cones for color vision
Term
blind spot/optic disk
Definition
lacks rods and cones; place where the optic nerve leaves the eye
Term
lens
Definition
clear structure which focuses the light entering the eye
Term
posterior cavity
Definition
large; would normally be filled with jelly-like vitreous humor
Term
anterior cavity
Definition
would normally be filled with aqueous humor; 2 divisions: anterior chamber and posterior chamber
Term
anterior chamber
Definition
poriton of the anterior cavity in front of the iris
Term
posterior chamber
Definition
very small portion of the anterior cavity between the lens and the iris
Term
optic nerve
Definition
2nd cranial nerve which passes sensory information from the eye to the brain
Term
canal of Schlemm
Definition
tiny hole at the junction of the cornea and the sclera for drainage of aqueous humor from the anterior cavity
Term
tapetum lucidum
Definition
iridescent portion of the choroid; reflects some light passing through the retina back onto the rods and cones hence facilitates animals seeing in dim light; man does not have this structure
Term
pigmented retina
Definition
outer layer of the retina; dark; would be adjacent to the choroid portion of the eye
Term
photoreceptor neurons
Definition
neurons which specifically respond to light; rods and cones
Term
bipolar neurons
Definition
a layer of neurons found interior to rods and cones
Term
ganglionic neurons
Definition
innermost layer of neurons in the retina of the eye; these would not be in contact with the posterior cavity in the intact eye; axons of these neurons converge to form the optic nerve
Term
photopupil reflex
Definition
when a bright light is in a person's eye, the pupil constricts; when the light is removed, it dilates
Term
accommodation reflex
Definition
the pupil will constrict when viewing a near object and dilate when viewing a far object
Term
convergence reflex
Definition
the eyeballs will converge when viewing a near object
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