Chapter 13 A&P Test

Mr. Dowd A&P1; Initially compiled by tucker50smith on Quizlet. I added pictures

A patient with no sensation in the left thumb would most likley have nerve damage of the _________ spinal nerve.

C6

A _________ is a cordlike organ composed of numerous _________.

nerve; axons

Sensory stimuli enter the spinal cord via _________.

afferent axons

A mixed nerve consists of both _________ and _________.

afferent; efferent fibers

The connective tissue that surrounds a nerve fascicle is called the ________.

perineurium

Which of the following nerves originates in the lumbosacral plexus?

Ilioinguinal

Obturator

Sciatic

Phrenic

Axillary

Sciatic

Which structures are highlighted in the picture below (reference leader lines).

Ventral rami

Which of the following is not considered a region of the spinal cord?

Sacral

Pelvic

Lumbar

Thoracic

Cervical

Pelvic

A ganglion is a ________.

cluster of cell bodies in the PNS

Interneurons are located in the ________.

spinal cord

Voluntary motor impulses leave the spinal cord via the _________ of gray matter.

anterior horn

Epidural anesthesia is introduced to the epidural space between the _________ to block pain signals during pregnancy.

dural sheath and vertebral bones

A simple spinal reflex typically involves how many neurons?

3

Which of the following is not a property of reflexes?

Reflexes are responses to sensory inputs.

Reflexes are not voluntary.

Reflexes do not require a stimulus.

Reflex responses are very predictable.

Reflexes are quick responses of the nervous system.

Reflexes do not require a stimulus.

Reflex arcs that only use two neurons are called _________ reflex arcs.

monosynaptic

Which reflex shows the least synaptic delay?

The cross extension reflex

The withdrawal reflex

A polysynaptic reflex

The flexor reflex

The tendon reflex

The tendon reflex

Which one of the following best describes the order of a somatic reflex?

Somatic receptor → efferent nerve fiber→ interneuron → afferent nerve fiber → skeletal muscle

Somatic receptor → efferent nerve fiber → afferent nerve fiber → interneuron → skeletal muscle

Somatic receptor → afferent nerve fiber → interneuron → efferent nerve fiber → smooth muscle

Somatic receptor → afferent nerve fiber → interneuron → efferent nerve fiber → skeletal muscle

Somatic receptor → interneuron → afferent nerve fiber → efferent nerve fiber→ skeletal muscle

Somatic receptor → afferent nerve fiber → interneuron → efferent nerve fiber → skeletal muscle

If a bee sting on the right thigh causes a quick involuntary reaction of the right arm, this would be an example of a(n) _________ reflex.

intersegmental

A reflex in which the sensory input and motor output are on opposite sides of the spinal cord is called _________.

contralateral

In the patellar tendon reflex arc, the patellar ligament is stretched, which stretches the quadriceps femoris muscle of the thigh. This reflex will cause the quadriceps femoris to _________ and the hamstrings to _________.

contract; relax

Which of the following is not a function associated with the spinal cord?

Protect neurons in both the ascending and descending tracts

Coordinate the alternating contraction of several muscle groups associated with locomotion

Mediate a reflex, such as the withdrawal of a hand from pain

Conduct motor information down the cord

Conduct sensory information up to the brain

Protect neurons in both the ascending and descending tracts

Which of the following structures is the richest in lipid content?

Arachnoid mater

Gray matter

Dura mater

Pia mater

White matter

White matter

There are _________ pairs of spinal nerves.

31

The bundle of nerve roots that occupy the vertebral canal from L2 to S5 is called the ________.

cauda equina

Motor commands are carried by _________ from the brain along the spinal cord.

descending tracts

The cervical plexus is the origin of the _________ nerve(s).

phrenic

Which structures are highlighted in the picture below (reference leader lines).

Dorsal rami