Question

lower motor neurons originate in what portion of the spinal cord? select an answer and submit. for keyboard navigation, use the up/down arrow keys to select an answer. a ventral horns b dorsal horns c cauda equina d pia mater

Answer 1

Lower motor neurons, originating in the ventral horn of the spinal cord, send motor output to skeletal muscles via the ventral nerve root.

Step-by-step explanation:

Lower motor neurons, crucial for the movement of skeletal muscles, originate in the ventral horn of the spinal cord. This area, also known as the anterior horn gray matter, contains multipolar motor neurons that act as the final output station for motor commands to skeletal muscles. The ventral horn's motor neurons project their axons out of the spinal cord through the ventral nerve root to meet and form the larger spinal nerves that serve the muscles.

Answer 2

The lower motor neurons originate in a. ventral horns the spinal cord. Therefore , a. ventral horns is correct .

Lower motor neurons (LMNs) are located in the ventral horn of the spinal cord. The ventral horn is a region of gray matter located on the ventral (front) side of the spinal cord.

It contains the cell bodies of LMNs, which are responsible for sending signals from the spinal cord to the muscles.

The other answer choices are incorrect:

Dorsal horns: The dorsal horns are located on the dorsal (back) side of the spinal cord and contain the cell bodies of sensory neurons, which receive signals from the body's sensory receptors.

Cauda equina: The cauda equina is a bundle of spinal nerves that form the "horse's tail" at the lower end of the spinal cord.

Pia mater: The pia mater is the innermost of the three meninges, which are protective membranes that surround the brain and spinal cord.