Question

Discuss the anatomical arrangement of grey and white matter, dorsal and ventral roots, dorsal root ganglia, central canal

A) Grey matter contains cell bodies, while white matter has myelinated axons. Dorsal roots carry sensory information, ventral roots carry motor signals. Dorsal root ganglia house sensory neuron cell bodies. The central canal contains cerebrospinal fluid.
B) Grey matter comprises axons, and white matter consists of cell bodies. Dorsal roots transmit motor signals, ventral roots convey sensory information. Dorsal root ganglia contain motor neuron cell bodies. The central canal holds blood vessels.
C) Grey matter houses axons, and white matter contains unmyelinated axons. Dorsal roots transmit motor signals, ventral roots convey sensory information. Dorsal root ganglia house motor neuron cell bodies. The central canal holds neurotransmitters.
D) Grey matter consists of cell bodies, and white matter contains myelinated axons. Dorsal roots transmit sensory signals, ventral roots carry motor information. Dorsal root ganglia house motor neuron cell bodies. The central canal holds synaptic vesicles.

Answer 1

The grey matter of the spinal cord consists of neuron cell bodies and interneurons, while the white matter contains myelinated axons. Dorsal roots carry sensory information to the spinal cord and have sensory neuron cell bodies in the dorsal root ganglia. Ventral roots transmit motor signals from the spinal cord to the body, and the central canal contains cerebrospinal fluid. The correct option is A.

Step-by-step explanation:

In considering the anatomical arrangement of the spinal cord, one must distinguish between grey and white matter, the dorsal and ventral roots, dorsal root ganglia, and the central canal. Grey matter is found in the core of the spinal cord and primarily contains the cell bodies of neurons and interneurons.

Interneurons connect neurons located in different parts of the body. The grey matter is visually arranged in a butterfly shape within the spinal cord.

The white matter of the spinal cord consists mainly of myelinated axons, which appear white due to the fatty myelin sheath that insulates them. This white matter is organized into columns that carry sensory information to the brain via ascending tracts and motor commands from the brain via descending tracts.

The dorsal roots contain the axons of sensory neurons that carry sensory information from the periphery of the body to the spinal cord, and these neurons have their cell bodies in the dorsal root ganglia. In contrast, the ventral roots contain axons of motor neurons that convey signals from the spinal cord to muscles and glands.

The central canal of the spinal cord is a fluid-filled space that runs through the center of the grey matter and contains cerebrospinal fluid, which serves as a cushioning agent and provides nutrients to the nervous tissue.