Examination of a tissue sample from the central nervous system reveals many darkly pigmented cells. Thistissue probably came from the
A) nucleus gracilis.
B) nucleus cuneatus.
C) motor cortex.
D) substantia nigra.
E) cerebellar nucleus.

Question

Quizplus · Accepted Answer

The presence of darkly pigmented cells indicates the tissue sample is from the substantia nigra, a region of the brain associated with the production of dopamine and involved in movement control. Parkinson's disease is characterized by the degeneration of dopaminergic neurons in the substantia nigra, resulting in motor impairments.

Examination of a Tissue Sample from the Central Nervous System