Peripheral Nervous System

Question 1

➢ Connects the CNS to the body (trunks and limbs)
➢ Motor and sensory in nature
➢ Made up of neurons

Answer 1

Peripheral Nervous System

Question 2

The head of the neuron

Answer 2

Cell body

Question 3

➢ Motor cell body at anterior horn cell
➢ Sensory cell body at dorsal root ganglion
➢ Axons are wrapped in myelin (produced by
oligodendroglia)

Answer 3

Peripheral Nerve Neuron

Question 4

Each neuron wrapped by an _____.

Answer 4

Endoneurium

Question 5

Each spinal root wrapped by a _____.

Answer 5

Perineurium

Question 6

Each peripheral nerve is wrapped by _____.

Answer 6

Epineurium.

Question 7

Blood supply of the PNS.

Answer 7

Vasa Nervorum

Question 8

Compression of the whole nerve

Answer 8

Neuropraxia

Question 9

➢ Axon cut but nerve sheath intact
➢ Occurs when there is starvation issues, poisoning,
diabetes, or cancer

Answer 9

Axonotmesis

Question 10

➢ Both axons and nerve sheath cut
➢ Seen in trauma

Answer 10

Neurotmesis

Question 11

Muscle spindles are receptors for changes of length in muscles, and the muscle should be taut to keep the muscle spindle working. Buried in the muscle and they contain afferent receptors for stretch, but they also contain contractile elements (gamma motor neurons).

Answer 11

Intrafusal Nerve Fibers

Question 12

➢ Comprise the bulk of muscle and form the major
force-generating structure (alpha motor neurons)

Answer 12

Extrafusal Nerve Fibers

Question 13

Composed of acetylcholine and needs ACH receptors in the muscle.

Answer 13

Neurotransmitters

Question 14

An enzyme in the synapse degrades ACH into Acetyl and COA

Answer 14

Acetylcholinesterase

Question 15

➢ Made up of lower motor neurons, ventral root,
anterior horn cell
➢ Going through the ventral root and going through
you extrafusal skeletal muscle fibers
➢ Stretching muscle causes a reflex contraction
➢ Controlled/inhibited by the higher centers

Answer 15

Reflex Arc

Question 16

The nerve that is an upper arm flexor

Answer 16

Musculocutaneous Nerve

Question 17

Nerves that are elbow extensors

Answer 17

Radial Nerve

Question 18

Nerves that are extrinsic finger flexors and pronators

Answer 18

Median Nerve

Question 19

Nerves that are intrinsic hand muscles

Answer 19

Ulnar Nerve

Question 20

The nerve that supplies sensory and motor of all thigh except posterior

Answer 20

L2, L3. AND L4

Question 21

The nerve in the quadriceps and sensory in the anterior thigh.

Answer 21

Femoral Nerve (Posterior)

Question 22

The nerve in the adductors of the thigh and sensory in the medial aspect of the thigh

Answer 22

Obturator Nerve (Anterior)

Question 23

The nerve that is sensory only.

Answer 23

Lateral Femoral Cutaneous Nerve.

Question 24

The nerve that is sensory and motor of the posterior thigh, calf, and foot.

Answer 24

L4, L5, S1, S2, S3, AND S4

Question 25

The nerve is sensory and motor to posterior thigh muscles, plantar flexors, flexors of the toes, and the intrinsic muscle of the toes.

Answer 25

Tibial Nerve

Question 26

The nerve supplies the dorsiflexors and extensors of the toe.

Answer 26

Common Peroneal Nerve

Question 27

The nerve that is sensory and motor to your perineal area (genitalia).

Answer 27

Pudendal Nerve

Question 28

The nerve that gives parasympathetic function for the sacral plexus.

Answer 28

Pelvic Splanchnic Nerve

Question 29

The nerve that supplies Gluteus Medius and Minimus

Answer 29

SGN (L4, L5, S1)

Question 30

The nerve that supplies Gluteus Maximus

Answer 30

IGN (L5, S1)