Question

select the correct answer. what could be a result of an injury to the dorsal column?
a. loss of sensation to pressure and touch
b. loss of control over all involuntary movements
c. inability of the body to maintain homeostasis
d. inability to regulate the sleep-wake cycle
e. loss of motor control

Explanation:

The dorsal column in the spinal cord is responsible for transmitting sensory information related to fine touch, pressure, vibration, and proprioception. So an injury to it would affect these sensory functions. Option A is about loss of sensation to pressure and touch, which aligns with the function of the dorsal column. Option B is incorrect as involuntary movements are controlled by other parts (like the autonomic nervous system and brainstem, not just dorsal column). Option C: Homeostasis is maintained by multiple systems including the endocrine and autonomic nervous system, not directly by dorsal column. Option D: Sleep - wake cycle is regulated by the hypothalamus and other brain regions, not dorsal column. Option E: Motor control is related to motor pathways (like corticospinal tracts), not the dorsal column (which is sensory).

Answer:

A. loss of sensation to pressure and touch