Question

State the location of the second order neurons in the posterior column-medial lemniscus pathway. Name the tract formed by axons of these neurons and identify the location of the neuraxis at which they decussate. Name the tract through which fibers of the second order neurons ascend from the medulla up to the brain.

a) Second order neurons are located in the dorsal horn. The tract formed by their axons is the lateral spinothalamic tract. Decussation occurs at the spinal cord level. Fibers ascend through the corticospinal tract.
b) Second order neurons are located in the thalamus. The tract formed by their axons is the posterior column-medial lemniscus. Decussation occurs at the medulla. Fibers ascend through the medial lemniscus.
c) Second order neurons are located in the dorsal root ganglia. The tract formed by their axons is the anterior corticospinal tract. Decussation occurs at the midbrain. Fibers ascend through the lateral spinothalamic tract.
d) Second order neurons are located in the spinal cord gray matter. The tract formed by their axons is the dorsal column. Decussation occurs at the pons. Fibers ascend through the anterior corticospinal tract.

Answer 1

The second order neurons in the posterior column-medial lemniscus pathway are located in the dorsal horn. The axons of these neurons form the posterior column-medial lemniscus tract. These axons ascend from the medulla up to the brain through the medial lemniscus.

Step-by-step explanation:

The location of the second order neurons in the posterior column-medial lemniscus pathway is:

• They are located in the dorsal horn.

The tract formed by their axons is the posterior column-medial lemniscus.

The decussation of these neurons occurs at the medulla.

The tract through which fibers of the second order neurons ascend from the medulla up to the brain is the medial lemniscus.