robin082006
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199. An individual has difficulty in adjusting his head, especially after he changes his posture. The most likely pathway affected that might cause this deficit is the
a. Lateral vestibulospinal tract
b. Medial vestibulospinal tract
c. Medial reticulospinal tract
d. Lateral reticulospinal tract
e. Rubrospinal tract
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| mitty
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?B
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| vanshita
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A
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| tolito
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B
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| vanshita
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The lateral vestibulospinal tract is involved in postural control (especially related to movements of the head) by inhibiting axial flexor muscles, and stimulating axial extensor muscles. The medial longitudinal fasiculus is involved in the coordination of head and eye movements.
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| robin082006
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The answer is b. (Afifi, pp 82–85.)
The medial vestibulospinal tract arises from the medial vestibular nucleus and descends in the medial longitudinal fasciculus to cervical levels where it controls LMNs, which innervate (flexor) muscles controlling the position of the head.
The lateral vestibulospinal tract facilitates extensor motor neurons of the limbs;
the rubrospinal tract facilitates flexor motor neurons of the limbs;
and thereticulospinal tracts modulate muscle tone of the limbs.[/left]
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