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46 terms

Sense Organs RG Vocab

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Aqueous Humor
clear fluid in the anterior chamber of eye between the cornea and iris
Retina
inner layer of eye that contains photo receptors
Optic Nerve
short, thick nerve pathway that contains nerve fibers
Blood Vessels
vessels which carry blood throughout the eye
Lens
disk located behind iris that changes shape to help focus the eye
Sclera
outer layer of the wall of the eye "white of the eye" which preserves the shape of the eyeball and protects inner parts
Vitreous Humor
a transparent, jellylike substance within the center of the eyeball
Cornea
transparent, protective covering
Pupil
black hole in the center of the iris where light enters the eye
Fovea
sight of sharpest vision
Iris
controls amount of light entering eye which consists of tiny muscles
Choroid
middle layer of the wall of the eye; contains many blood vessels which results in a deep color that prevents reflecting of light inside the eye
Hammer
the first ossicle; it touches the eardrum and transfers vibration from the eardrum to the anvil
Auditory Canal
tube that conducts external sound waves to the inner ear
Pinnae
external structure that collects and directs sound waves to the auditory canal
Stirrup
the third ossicle; transfers vibration sent to it from the hammer and anvil to the cochlea
Tympanum
membrane that vibrates as sound waves, transport via auditory canal, strike it
Anvil
the middle ossicle; transfers vibration from the hammer to the stirrup
Eustachian tube
connects the middle ear with the roof of the mouth
cochea nerve
transmits nerve impulses to the brain
cochlea
tightly coiled, fluid filled snail shell structure which houses the sound receptors
Semicircular canals
canals in the inner ear which detect rotation of the head and are important in the maintenance of balance
cementum
bone, mineralized with a significant content of collagen fibers; lies between dentin and the periodontal membrane
crown
portion of the tooth found above the surface of the gum line; dentin covered by enamel
dentin
bone-like material found below enamel
enamel
hardest substance in the body, covers the crown of the tooth
pulp
contains nerves, arteries, and veins that supply the tooth
neck
portion of the tooth at the gum line
root
bulk of the tooth; portion of tooth rooted in the bone
root canal
canal where nerves, arteries, and veins pass
neuron
cells that transmit impulses
threshold
minimum level of stimulus required to activate a neuron
neurotransmitters
chemicals used by a neuron to transmit an impulse to another cell
synapse
location at which a neuron can transfer an impulse to another cell
axon
long fiber that carries impulses away from the cell body
dendrites
carry impulses from the environment to the cell body; short with branches
cell body
contains the nucleus and cytoplasm
myelin sheath
insulating membrane that surrounds a single long axon
somatic
regulates activities under conscious control
autonomic
regulates activities that are involuntary
cerebrum
responsible for voluntary activities of the body
thalamus
receives messages from all of the sensory receptors and relays info to the cerebrum
hypothalamus
control center for recognition and analysis of hunger, thirst, fatigue, anger and body temp.
cerebellum
back of skull; coordinates and balances actions of muscles so the body can move gracefully
brain stem
connects the brain and spinal cord
spinal cord
main communications link between the brain and rest of the body