Question

After crossing midline, the axon of the upper motor neuron continues its descent in the lateral portion of the spinal cord called the ______________ [Anterolateral tract, Lateral corticospinal tract]. Once the upper motor neuron reaches its intended lower motor neuron, the upper motor neuron synapses onto a ____________________ [upper motor neuron, lower motor neuron] in the ___________________ [Dorsal Horn, Dorsal root, Ventral horn, Ventral root] of the spinal cord.

Answer 1

Answer:

The correct answer will be options

1. Lateral corticospinal tract

2. lower motor neuron

3. Ventral horn.

Explanation:

The descending neuron originates from the cerebral cortex of the brain which converges and descends into internal capsule through which it descends into the brain stem of the brain.

At the crossline of the brain stem and spinal cord upper motor neurons descend into the spinal cord through which it passes into the lateral corticospinal tract and reaches the ventral horn.  At these ventral horns the upper motor neurons transfer its impulse to lower motor neurons which sends signals to effector organs.

Thus, Lateral corticospinal tract, lower motor neuron and ventral horn are the correct options.