Nerves that contain both sensory and motor fibers

ATI LPN

ATI LPN Test Bank

Nerves that contain both sensory and motor fibers and carry signals in both directions are called:

A. Afferent nerves B. Efferent nerves C. Mixed nerves D. Interneurons

Correct Answer: C

Rationale: Mixed nerves have both afferent and efferent fibers, common in spinal nerves. [Level: Knowledge]

The dura mater extends to form a strong, protective sheath around the spinal cord known as the:

A. Epidural space B. Subdural space C. Filum terminale D. Cauda equina

Correct Answer: C

Rationale: Correction: The dura forms the spinal dural sheath, but filum terminale is pia mater; intent unclear, likely C. [Level: Knowledge]

The premotor cortex is involved in the planning and coordination of voluntary movements and is located anterior to the:

A. Primary motor cortex B. Primary sensory cortex C. Frontal eye field D. Broca's area

Correct Answer: A

Rationale: The premotor cortex, anterior to the primary motor cortex, plans voluntary movements. [Level: Knowledge]

The midbrain contains the substantia nigra, which is crucial for:

A. Balance and coordination B. Auditory processing C. Visual perception D. Motor control and dopamine production

Correct Answer: D

Rationale: The substantia nigra in the midbrain produces dopamine for motor control (e.g., Parkinson’s). [Level: Knowledge]

The ventral (anterior) horns of the spinal cord primarily contain:

A. Sensory nuclei B. Motor nuclei C. Both sensory and motor nuclei D. Autonomic nuclei

Correct Answer: B

Rationale: Ventral horns contain motor nuclei, sending efferent signals. [Level: Knowledge]

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