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Senses and Endocrine
Exam on senses and endocrine
37
Anatomy
Undergraduate 2
04/12/2009

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Cards

Term
1) Rods and Cones
2) Optic nerve
3) Optic Chiasma
4) Thalamus
5) Occipital lobe: 1/2 cross over @ chiasma, 1/2 do not
Definition
List the path of vision (visual pathway)
Term
1) Refraction of light
2) Accomodation
3) Constriction of pupil
4) Convergence of the visual axis
Definition
What are the 4 processes necessary for vision?
Term
Refraction of light
Definition
light waves are bent when they move through different densities - occurs when light waves pass @ an oblique angle from a medium of one optical density into a medium of a different optical density
Term
Accomodation
Definition
When the ciliary muscles and suspensory ligaments, along w/the structure of the lens itself, enable the lens to adjust shape to facilitate focusing
Term
Constriction of pupil
Definition
When reading, pupil has to be very relaxed and dilated...In darkness, pupil must dilate even more.
Term
Convergence of the visual axis
Definition
eyes have to focus the object on the fovea centralis - crossing of the eyes when bringing finger closer while focusing on it - very important for focusing on reading (can do exercises to improve this)
Term
hyperopia
Definition
far-sighted; correct with convex lens
Term
myopia
Definition
near sighted - correct with a concave lens
Term
Convergence of the visual axis
Definition
eyes have to focus the object on the fovea centralis - crossing of the eyes when bringing finger closer while focusing on it - very important for focusing on reading (can do exercises to improve this)
Term
astigmatism
Definition
unequal curvature of the cornea (rippling; lines will be skewed)
Term
cataract
Definition
denatured protein of the lens or an opacity (light doesn't pass through)
Term
glaucoma
Definition
when there's an interference w/the drainage of aqueous humor
Term
Fovea centralis
Definition
A depression at the center of the macula lutea; in the region of the retina that produces the sharpest vision.
Term
macula lutea
Definition
a yellowish spot in the central region of the retina
Term
rhodopsin
Definition
the light sensitive biochemical in rods, called visual purple
Term
light-adapted
Definition
rhodopsin; opsin + Retinine + energy = creates impulse: Retinine converts to Vitamin A
Term
Dark adapted
Definition
Vitamin A + ATP forms Retinine; Retinine combines w/ opsin; Becomes Rhodopsin (visual purple)
Term
conjunctiva
Definition
entire eyelid in front of the eye is covered by a mucous membrane
Term
lacrimal apparatus
Definition
consists of the lacrimal gland, which secretes tears, and a series of ducts that carry tears into the nasal cavity. The gland is located in the orbit and secretes tears continuously. The tears exit through tiny tubules & flow downward @ medially across the eye.
Term
Pinna
Definition
outer, funnel-like structure of the ear (auricle)
Term
external auditory meatus
Definition
S-shaped tube (external auditory canal) that leads inward through the temporal bone for about 2.5 cm.
Term
tympanic membrane
Definition
(eardrum) semitransparent membrane covered by a thin layer of skin on its outer surface and by mucous membrane on the inside; has an oval margin and is cone shaped - apex of the cone directed inward.
Term
ossicles (malleus, incus, stapes)
Definition
3 small bones in the middle ear (tympanic cavity). Tiny ligaments attach them to the wall of the tympanic cavity and they are covered by mucous membrane. These bones bridge the eardrum and the inner ear, transmitting vibrations between these parts.
Term
eustachian tubes
Definition
auditory tube connecting middle ear to throat; conducts air between tympanic cavity & outside of body by way of throat @ mouth
Term
cochlea
Definition
has a bony core and a thin, bony shelf that winds around the core like the threads of a screw; functions in hearing
Term
vestibule
Definition
leads from the oval window to the apex of the spiral (scala vestibuli)
Term
semicircular canals
Definition
parts of the labyrinth which provide a sense of equilibrium
Term
osseous labyrinth
Definition
bony canal in the temporal bone
Term
membranous labyrinth
Definition
tube that lies w/in the osseous labyrinth & has a similar shape.
Term
perilymph fluid
Definition
fluid that lies bet. the osseus and membranous labyrinths - secreted by cells in the wall of the bony canal.
Term
endolymph fluid
Definition
fluid contained in the membranous labyrinth
Term
ciliary body
Definition
thickest part of the middle layer, extends forward from the choroid coat and forms an internal ring around the front of the eye.
Term
ciliary muscles
Definition
groups of muscle fibers w/in the ciliary body
Term
suspensory ligaments
Definition
strong but delicate fibers that extend inward from the ciliary processes and hold the transparent lens in position
Term
lens
Definition
transparent; body lies directly behind the iris and pupil and is composed of differentiated epithelial cells called lens fibers.
Term
retina
Definition
inner coat which contains the visual receptor cells (photoreceptors) - This nearly transparent tissue is continuous with the optic nerve in the back of the eye and extends forward as the inner lining of the eyeball. It ends just behind the margin of the ciliary body.
Term
Adrenal,
Ovary
Pancreas
parathyroid glands
pineal gland
pituitary gland
testis
thymus
thyroid gland
placenta
Definition
10 endocrine glands
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