Lfork SENSES WRITE-UP FOR LABS 10 AND 12 (in addition to I. Ear A. Middle Ear De

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Lfork SENSES WRITE-UP FOR LABS 10 AND 12 (in addition to I. Ear A. Middle Ear Deafness Hold t will show you the mastoid process on a human skull. Only the handle should touch the A & T exercises) e handle of a vibrating tuning fork against the mastoid process. The instructor ead and the forks should be pointing back and away from the ear. Continue to hold the fork in this position until the sound can no longer be heard. Move the tuning fork to the side of the head so the forks are directly in front of the auditory opening. If no sound is heard, this indicates middle car deafness. Simulate middle ear deafness by plugging the ear canal with cotton or one finger. Then repeat the test. 1. Account for the fact that with inner ear deafness neither air or bone conduction will initiate hearing. B. Equilibrium The semicircular canals of the ear have already been studied as a basic part of this sense. Have your partner stand with two feet together and the arms held rigidly at the sides. Observe her/his body for a few minutes. Note any swaying movements and how the body is maintained in an upright position. Now, have the subject close his eyes and keep them tightly closed. Observe any differences in body movements as compared with previous observations Now, have the subject turn around rapidly 10 or 12 times (on a stool or by him/herself) and again observe body movements as she/he stands (or tries to stand) with feet together in the same position as before. Have the subject point toward the river (or windows, or front of room). Was she/he able to do so on the first try? 2. What is the function of the semicircular canals? The Anction ele semici veula als h Or 3. Describe the movements of the subject's body as she/he attempts to hold him or herself perfectly still with feet together. ts th hold hin

Explanation / Answer

Question 5) When the eyes are closed our bodies become relatively still, as we focus on our balance. The movement is tentative.

Question 6) The differences are due to a phenomenon called proprioception which is the body maintaining control and not falling. The rule is that the body needs atleast two out of three senses to maintain balance. Since vision is taken out of the picture, the body relies on the sense of gravity and the relative position of the muscles to maintain balance. hence the slowe movements.

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