Ap 1 Lab Ex 25 Answers

Topics: Auditory system, Ear, Cochlea Pages: 10 (1351 words) Published: December 5, 2014
Exercise 25
Special Senses: Hearing and Equilibrium

Answers to Pre-Lab Quiz (pp. 383–384)
2.a, auricle
3.tympanic membrane
4.d, stapes
5.a, cochlea
7.b, Rinne
8.b, internal ear
10.c, involuntary trailing of eyes in one direction, then rapid movement in the other

Answers to Activity Questions
Activity 4: Conducting Laboratory Tests of Hearing (pp. 387–388) Acuity Test
The threshold is indefinite.
Sound Localization
No, the sound is less easily located if the source is equidistant from both ears. Sound arriving from spots equidistant from both ears arrives at each ear at the same time and with equal loudness. This does not provide enough information to adequately locate the position of the source. Frequency Range of Hearing

Generally, high-frequency sounds are heard less clearly, but results depend on the loudness of each of the tuning forks. Activity 7: Conducting Laboratory Tests on Equilibrium (pp. 391–392) Balance Test

1.Nystagmus should not be present.
2.The cerebellum integrates input from receptors in the vestibule and semicircular canals, the eyes and somatic receptors, and coordinates skeletal muscle activity and regulates muscle tone. Barany Test

4.When rotation stops, the direction of nystagmus reverses. If the chair is rotated clockwise, the nystagmus will be counterclockwise. For a few seconds after the chair is stopped, the subject reports a feeling of movement in the same direction and the same speed in which the chair was spun. Romberg Test

2.Gross swaying movements are not usually observed when the eyes are open. 3. Side-to-side movement increases.
4. Front-to-back swaying occurs.
The equilibrium apparatus and proprioceptors are probably functioning normally.
Visual information is lacking and the result is increased swaying.
Equilibrium and balance require input from a number of receptors, including proprioceptors, the vestibular apparatus, and the eyes.

Review Sheet
Exercise 25
Special Senses: Hearing and Equilibrium
Lab Time/Date
Anatomy of the Ear
 1.Select the terms from column B that apply to the column A descriptions. Some terms are used more than once. Column A
 a        ,  d      ,  m      , 1. structure composing the external ear  b        ,  k       ,  n      , 2. structures composing the internal ear  e      ,  f       ,  l      , 3. collectively called the ossicles  i         4.  involved in equalizing the pressure in the middle ear with atmospheric pressure  m       5.  vibrates at the same frequency as sound waves hitting it; transmits the vibrations to the ossicles  k         ,  n          6. contain receptors for the sense of balance  g          7.  transmits the vibratory motion of the stirrup to the fluid in the scala vestibuli of the internal ear  j          8.  acts as a pressure relief valve for the increased fluid pressure in the scala tympani; bulges into the tympanic cavity  i         9.  passage between the throat and the tympanic cavity  c         10.  fluid contained within the membranous labyrinth  h       11.  fluid contained within the bony labyrinth and bathing the membranous labyrinth Column B

a. auricle (pinna)
b. cochlea
c. endolymph
d. external acoustic meatus
e. incus (anvil)
f. malleus (hammer)
g. oval window
h. perilymph
i. pharyngotympanic (auditory) tube
j. round window
k. semicircular canals
l. stapes (stirrup)
m. tympanic membrane
n. vestibule
 2.Identify all indicated structures and ear regions in the following diagram.

 3.Match the membranous labyrinth structures listed in column B with the descriptive statements in column A. Some terms are used more than once. Column A
 g       ,  j         1. sacs found within the vestibule  d         2. contains the spiral organ
 g       ,  j         3. sites of the maculae  h         4. positioned in all spatial planes  c         5. hair cells of spiral organ rest on this membrane  i         6. ...
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