White matter in the spinal cord primarily contains

ATI LPN

ATI LPN Test Bank

White matter in the spinal cord primarily contains:

A. Cell bodies and dendrites B. Myelinated axons C. Unmyelinated axons D. Synaptic terminals

Correct Answer: B

Rationale: White matter consists of myelinated axons forming tracts. [Level: Knowledge]

Which plexus contributes to the innervation of the diaphragm?

A. Cervical plexus B. Brachial plexus C. Lumbar plexus D. Sacral plexus

Correct Answer: A

Rationale: The cervical plexus (C3-C5) gives rise to the phrenic nerve for the diaphragm. [Level: Knowledge]

The trigeminal nerve (V) is involved in:

A. Controlling eye movements B. Chewing and facial sensation C. Hearing D. Taste sensation

Correct Answer: B

Rationale: The trigeminal nerve (CN V) mediates chewing (motor) and facial sensation (sensory). [Level: Knowledge]

The superior mesenteric ganglion, part of the sympathetic system, plays a role in the innervation of the:

A. Liver and gallbladder B. Stomach and spleen C. Small intestine D. Kidneys

Correct Answer: C

Rationale: The superior mesenteric ganglion innervates the small intestine. [Level: Knowledge]

Neurons that transmit nerve impulses from receptors to the central nervous system are _____ neurons:

A. interneuron B. motor neuron C. sensory neuron D. unipolar neuron

Correct Answer: C

Rationale: Sensory (afferent) neurons carry signals from receptors to CNS. [Level: Knowledge]

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