Chapter 17-The Special Senses Flashcards Preview

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Flashcards in Chapter 17-The Special Senses Deck (93)
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1

A saclike dilation of a canal or duct

Ampulla

2

The watery fluid, similar in composition to the cerebrospinal fluid, that fills the anterior cavity of the eye

Aqueous humor

3

An irregularity of the lens or cornea of the eye causing the image to be out of focus and producing fault vision

Astigmatism

4

One of the three small bones of the middle ear called the malleus, incus, and stapes

Auditory ossicle

5

The tube that connects the middle ear with the nose and nasopharynx region of the throat. Also called the eustachian tube or pharyngotympanic tube

Auditory tube

6

A membrane in the cochlea of the internal ear that separates the cochlear duct from the scala tympani and on which the spiral organ (organ of Corti) rests

Basilar membrane

7

Area in the retina at the end of the optic (II) nerve in which there are no photoreceptors

Blind spot

8

A series of cavities within the petrous portion of the temporal bone forming the vestibule, cochlea, and semicircular canals of the inner ear

Bony labyrinth

9

Loss of transparency of the lens of the eye or its capsule or both

Cataract

10

Waxlike secretion produced by the ceruminous glands in the external auditory meatus (ear canal)

Cerumen or ear wax

11

A modified sudoriferous (sweat) gland in the external auditory meatus that secretes cerumen

Ceruminous gland

12

One of the vascular coats of the eyeball

Choroid

13

One of the three parts of the vascular tunic of the eyeball, the others being the choroid and the iris; includes the ciliary muscle and the ciliary processes

Ciliary body

14

A winding, cone-shaped tube forming a portion of the inner ear and containing the spiral organ (organ of Corti)

Cochlea

15

The membranous cochlea consisting of a spirally arranged tube enclosed in the bony cochlea and lying along its outer wall

Cochlear duct or scala media

16

The type of photoreceptor in the retina that is specialized for highly acute color vision in the bright light

Cone

17

The delicate membrane covering the eyeball and lining the eyes

Conjunctiva

18

A synaptic arrangement in which the synaptic end bulbs of several presynaptic neurons terminate on one postsynaptic neuron. The medial movement of the two eyeballs so that the both are directed toward a near object being viewed in order to produce a single image

Convergence

19

The nonvascular, transparent fibrous coat through which the iris of the eye can be seen

Cornea

20

A crest or ridged structure. A small elevation in the ampulla of each semicircular duct that contains receptors for dynamic equilibrium

Crista

21

A mass of gelatinous material covering the hair cells of a crista; a sensory receptor in the ampulla of a semicircular canal stimulated when the head moves

Cupula

22

The maintenance of body position, mainly the head, in response to sudden movements such as rotation

Dynamic equilibrium

23

The primary germ layer that gives rise to the nervous system and the epidermis of skin and its derivatives

Ectoderm

24

A primary germ layer of the developing embryo; gives rise to the gastrointestinal tract, urinary bladder, urethra, and respiratory tract

Endoderm

25

A curved tube in the temporal bone that leads to the middle ear

External auditory canal or external auditory meatus

26

The outer ear, consisting of the pinna, external auditory canal, and tympanic membrane (eardrum)

External ear

27

The hairy ridge superior to the eye

Eyebrow

28

The superficial coat of the eyeball, made up of the posterior sclera and the anterior cornea

Fibrous tunic

29

One of the conical projections that are distributed in parallel rows over the anterior two-thirds of the tongue and lack taste buds

Filiform papilla

30

A mushroomlike elevation on the upper surface of the tongue appearing as a red dot; most contain taste buds

Fungiform papilla