Nerve fibers of the _____ tract decussate in the spinal cord and are involved in

Question

Nerve fibers of the _____ tract decussate in the spinal cord and are involved in regulating fine motor movements. A. tectospinal B. anterior spinothalamic C. lateral corticospinal D. anterior corticospinal Most corticospinal tracts decussate in the A. midbrain. B. cerebral nuclei. C. medulla oblongata. D. spinal cord. The extrapyramidal tracts A. arise in the cerebral cortex. B. always cross in the spinal cord. C. originate in the brainstem. D. are responsible for reflex generation of a Babinski sign.

Explanation / Answer

Ans 10) Anterior corticospinal. It is involved in the regulating the fine motor movements and are responsible for sending motor signals from brain to lower motor neurons which directly innervate muscle to produce movement.

Ans 11)Medulla Oblongata – Most of it begins in cerebral cortex and decussates in the pyramids of lower medulla.

Ans 12) arise from cerebral cortex – It is biological neural network which is part of motor system causing involuntary movements.

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