sense Flashcards

1
Q

results only from those stimuli that reach the cerebral cortex and are consciously perceived. Can be defined as general or special.

A

sensation

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2
Q

are sensory nerve endings or specialized cells capable of responding to stimuli by developing action potentials.

A

sensory receptors

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3
Q

general senses, such as pain, temperature, touch, pressure, and proprioception, are scattered throughout the body.

A

receptors

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4
Q

an unpleasant sensation that may be either localized or diffuse.

can be reduced or controlled by stimulation of tactile receptors as well as increased motor activity.

from deeper structures may be referred to more superficial structures, such as the skin.

A

pain

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5
Q

respond to chemical stimulation, vision to light stimulation, and hearing and balance to mechanical stimulation.

A

smell and taste

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6
Q

have enlarged distal ends with long cilia. The cilia have

A

olfactory neurons

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7
Q

The wide range of detectable odors results from

A

combinations of receptors responses

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8
Q

of the olfactory neurons form the olfactory nerves, which enter the olfactory bulb.

the vestibular portion of the vestibulocochlear nerve project to the vestibular nucleus and on to the cerebral cortex.

A

axons

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9
Q

carry action potentials from the olfactory bulbs to the olfactory cortex of the brain.

A

olfactory tract

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10
Q

contain taste cells with hairs that extend into taste pores.
Receptors on the hairs detect dissolved substances.

A

taste buds

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11
Q

carries taste from the anterior two-thirds of the tongue;

A

facial nerve

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12
Q

carries taste from the posterior one-third of the tongue

A

glossopharyngeal nerve

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13
Q

carries taste from the root of the tongue

A

vagus nerve

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14
Q

prevent perspiration from entering the eyes.

A

eyebrows

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15
Q

protect the eyes from foreign objects.

A

eyelids

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16
Q

covers the inner eyelids and the anterior surface of an eye

A

conjunctiva

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17
Q

produce tears that flow across the eye surface to lubricate and protect the eye. Excess tears pass through the nasolacrimal duct into the nasal cavity.

A

lacrimal glands

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18
Q

move the eyeball.

A

extrinsic eye muscles

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19
Q

the outer layer of the eye. It consists of the sclera and cornea.

A

fibrous tunic

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20
Q

the middle layer of the eye. It consists of the choroid, ciliary body, and iris.

A

vascular tonic

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21
Q

held in place by the suspensory ligaments, which are attached to the smooth muscles of the ciliary body.

22
Q

the inner layer of the eye and contains neurons sensitive to light.

A

nervous tunic

23
Q

responsible for vision in low illumination (night vision).

24
Q

responsible for color vision.

25
the center of the macula has the highest concentration of cones and is the area where images are detected most clearly.
fovea centralis
26
where the optic nerve exits the eye and blood vessels enter.
optic disc, or blind spot,
27
The anterior and posterior chambers of the eye are anterior to the lens and are filled with
aqueous humor
28
filled with vitreous humor.
vitreous
29
keep the eye inflated, refract light, and provide nutrients to the inner surface of the eye.
humors
30
passing through a concave surface diverges. Light passing through a convex surface converges. causes retinal to change shape, which causes opsin to change shape, leading eventually to cellular changes that result in an action potential at the retina.
light
31
cross at the focal point and are said to be focused.
converging light rays
32
responsible for most of the convergence, whereas the lens can adjust the focus by changing shape (accommodation).
cornea
33
conducted along the optic nerve.
action potential
34
pass through the optic nerves to the optic chiasm, where some cross. from the nasal retina cross, and those from the temporal retina do not.
axons
35
from the chiasm lead to the thalamus.
optic tract
36
extend from the thalamus to the visual cortex in the occipital lobe.
optic radiation
37
consists of the auricle and the external auditory canal.
external ear
38
contains the three auditory ossicles. also connected to the mastoid air cells.
middle ear
39
(eardrum) is stretched across the external auditory canal.
tympanic membrane
40
tube connects the middle ear to the pharynx and equalizes pressure.
auditory or eustachian
41
has three parts: the semicircular canals, the vestibule, and the cochlea.
inner ear
42
a canal shaped like a snail's shell. divided into three compartments by the vestibular and basilar membranes.
cochlea
43
consists of hair cells that attach to the basilar and tectorial membranes.
spiral organ
44
are funneled through the auricle down the external auditory canal, causing the tympanic membrane to vibrate.
sound waves
45
are passed along the ossicles to the oval window of the inner ear.
tympanic membrane vibrations
46
action potentials travel to the cochlear nucleus and on to the cerebral cortex.
vestibulocochlear nerve,
47
evaluates the position of the head relative to gravity.
static equilibrium
48
located in the vestibule, consist of hair cells with the microvilli embedded in a gelatinous mass that contains otoliths.
maculae
49
evaluates movements of the head
dynamic equilibrium
50
each semicircular canal contains a crista ampullaris, which has hair cells with microvilli embedded in a gelatinous mass, the cupula.
ampulla