Question

To voluntarily move your fingers, you directly use the:

A. Dorsal White Columns Tract

B. Spinothalamic Tract

C. Spinocerebellar Tract

D. Pyramidal Tract

E. Extrapyramidal Tract

Answer 1

Answer :

Q. To voluntarily move your fingers, you directly use the:

Answer : D. Pyramidal tract

Pyramidal tracts – These tracts originate in the cerebral cortex, carrying motor fibres to the spinal cord and brain stem. They are responsible for the voluntary control of the musculature of the body and face,including voluntary movement of fingers.

The pyramidal tracts include both the corticobulbar tract and the corticospinal tract. These are aggregations of efferent nerve fibers from the upper motor neurons that travel from the cerebral cortex and terminate either in the brainstem (corticobulbar) or spinal cord (corticospinal) and are involved in the control of motor functions of the body.

The nerves within the corticospinal tract are involved in movement of muscles of the body. Because of the crossing-over of fibres, muscles are supplied by the side of the brain opposite to that of the muscle.The nerves within the corticobulbar tract are involved in movement in muscles of the head. They are involved in swallowing, phonation, and movements of the tongue. By virtue of involvement with the facial nerve, the corticobulbar tract is also responsible for transmitting facial expression.With the exception of lower muscles of facial expression, all functions of the corticobulbar tract involve inputs from both sides of the brain.