Vestibular sense. This lab involves physical activity – you are responsible for
ID: 3518273 • Letter: V
Question
Vestibular sense. This lab involves physical activity – you are responsible for determining if you are capable of doing the actions yourself or asking someone to do them in your place and then observing/discussing the results to answer the questions below. Make sure you take a break between each question so you can return to a neutral position / level of activity.
1. Stand normally – feet roughly hip-width apart, arms at sides. Describe how this act of standing feels (e.g., steady, like hard work, jittery).
Explanation / Answer
ANSWER:
VESTIBULAR SENSE:The vestibular apparatus is a complex sense organ which is stimulated by
1.Gravity
2.Rotation of movements
Vestibular apparatus plays an important role in postural activity,it gives rise to afferent impulses which reflexly adapt the position of the trunk and limbs to that of the head and enable the erect position.
Impulses from the vestibule also reach the cerebral cortex and subserve the recognition of the position and the movement of the head.
ACT OF STANDING NORMALLY:
Feet hip width with arms at sides---when a man is comfortably balanced in the upright position there is remarkably little activity in the muscles of the trunk and thighs.
This is due to the disposition of the skeleton, ligaments, and the soft parts.This passive erect posture in the absence of all muscular activity is momentary and insecure and the person would immediately fall if muscular activity did not develop.
Once the person begins to fall, reflex compensatory muscular reaction sets in which restore the state of balance.The muscular contraction then ceases till the next deviation from the erect position occurs.
The muscles which oppose the fall act as antigravity muscles.Any of the muscles of the trunk or legs act as antigravity muscles.
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