Ch. 13 - spinal cord and nerves

A reflex pathway having only one synapse in the CNS is called what?

A polysynaptic reflex arc.

The nerve labeled B in the diagram arises from which plexus?

Brachial plexus

Which portion of the spinal cord contains cell bodies and axons of interneurons as well as incoming axons of sensory neurons?

C

Which of the following nerves is labeled F in the diagram?

Common fibular nerve

Where is the pia mater?

E

What is not a common characteristic of dermatomes?

Each dermatome is only served by a single spinal nerve

What part of a nervous reflex arc is usually a muscle or gland?

Effector?

What lists the CT coverings of the axons, fascicles, and entire nerve in the correct order?

Endoneurium, perineurium, epineurium

Where is the subdural space?

F

Which nerves labeled in the diagram form the sciatic nerve?

F and G

Where is the posterior ramus?

G

Which portion of the spinal cord contains the cell bodies of somatic motor neurons and motor nuclei?

H

Which of the following structures is labeled D in the diagram?

Lumbar enlargement

Denticulate ligaments are thickenings of __________

Pia mater

This branch of a spinal nerve serves the deep muscles and the skin of the posterior surface of the trunk

Posterior ramus

The cell bodies of the sensory neurons that carry information from the periphery to the spinal cord are located in the ____________

Posterior root ganglion

A nerve impulse initiated at a muscle spindle has to travel through what structure to get to the spinal column?

Posterior root of the spinal nerve

What is not a function of the spinal reflexes that use muscle spindles and tendon organs as sensors?

Protection of spinal nerves

The structure labeled H in the diagram belongs to which group of spinal nerves?

Sacral nerves

Which of the following nerves is labeled G in the diagram?

Tibial nerve