Sense Organs RG Vocab

46 terms by umX52 

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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

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