Nerve Man Model, Nerves, Nerve Plexuses, and Reflexes, Neuron Anatomy, Spinal Cord Anatomy

brachial plexus

cervical plexus

lumbar plexus

sacral plexus

C1 spinal nerve

median nerve

radial nerve

femoral nerve

sciatic nerve

ulnar nerve

1 and 3

brachial plexus

Nerve plexus formed by parts of C5 plus nerves C6,C7, C8 and T1.

8; 16

There are ____ pair(s) of cervical spinal nerves, which correspond to a total of ___.

12; 24

There are ____ pair(s) of thoracic spinal nerves, which correspond to a total of ___.

5; 10

There are ____ pair(s) of lumbar spinal nerves, which correspond to a total of ___.

5; 10

There are ____ pair(s) of sacral spinal nerves, which correspond to a total of ___.

1; 2

There are ____ pair(s) of coccygeal spinal nerves, which correspond to a total of ___.

31; 62

There are ____ pair(s) of spinal nerves, which correspond to a total of ___.

31 total segments and 5 named regions

Total number of segments of the spinal cord and total number of named regions of the spinal cord.

brachial

The ____ plexus innervates the upper limb.

lumbar

The ____ plexus innervates the upper thigh.

cervical

The ____ plexus innervates the neck and skin of the upper chest.

sacral

The ____ plexus innervates the perineum and lower limb.

diaphragm

The phrenic nerve controls what major muscle for breathing?

femoral nerve

controls the muscles of the anterior thigh and provides cutaneous innervation to the skin of the medial leg

pudendal nerve

innervates the external anal sphincter, external urethral sphincter and perineum. It provides cutaneous innervation to the medial scrotum and perineum.

radial nerve

provides motor innervation to the triceps brachii and the extrinsic extensors of the wrists and hands; it also provides cutaneous sensory innervation to most of the back of the hand

ulnar nerve

is associated with the following functions: • Innervation of the pinky and ring fingers, and the intrinsic muscles of the hand; provides cutaneous sensory innervation to the back of the little finger and adjacent half of the ring finger

sciatic nerve

controls the posterior thigh muscles, muscles of the leg and skin of the leg (except medial leg)

The sciatic and pudendal nerves are major nerves of the ____ plexus.

sacral

The femoral, genitofemoral, and obturator nerves are major nerves of the ____ plexus.

lumbar

The phrenic nerve is an important nerve of the ___ plexus.

cervical

The radial, ulnar, and median nerves are nerves of the ___ plexus.

brachial

The nerve contains axons of both sensory and motor neurons, e.g. all spinal nerves are mixed nerves.

What does it mean when you refer to a nerve as a mixed nerve?

connective tissue wrapping around a nerve

What is the epineurium?

connective tissue wrapping around an axon

What is the endoneurium?

endoneurium

Identify.

nerve fascicle

Identify.

epineurium

2

perineurium

Identify.

connective tissue wrapping around a nerve fascicle

What is the perineurium?

interneuron; integration center

A is what component of a reflex arc?

motor neuron

B is what component of a reflex arc?

effector

C is what component of a reflex arc?

sensory neuron; afferent neuron

D is what component of a reflex arc?

sensory receptor; receptor

E is what component of a reflex arc?

somatic

What type of reflex is depicted based on the effector?

polysynaptic

What type of reflex is depicted based on the number of synapses?

genitofemoral nerve

has motor fibers that cause the cremaster muscle to contract, elevating the testis. It provides cutaneous innervation to the upper portion of the inner thigh, lateral scrotum, mons pubis, and labia majora.

Flexion of the thumb; opposition of the thumb; flexion of the pointer and middle fingers; flexion of the wrist; abduction of the wrist; pronation of the forearm

List some motor functions of the median nerve

wrist extension; extension of the elbow; extension of the thumb; extension of the fingers

list some motor functions of the radial nerve

knee extension; hip flexion; hip adduction

List some motor functions of the femoral nerve

knee flexion; medial rotation of the hip; extension of the hip; dorsiflexion; plantar flexion; inversion; eversion

List some motor functions of the sciatic nerve

median

The ____ nerve innervates the skin of the palmar side of the index finger, thumb, middle finger, and half the ring finger and innervates all the flexors of the forearm.

axon hillock

Identify A.

nucleus

Identify B

dendrite

Identify C

Nissl substance

Identify D

Schwann cell

A is the nucleus of a _____.

axon

Identify B

myelin

Identify C

mitochondria

Identify D

node of Ranvier

Identify

axolemma

Identify

neurilemma

Identify

endoneurium

Identify

Branchlike parts of a neuron that are specialized to receive information

Function of dendrites

enables vastly greater transmission speed of neural impulses as the impulse hops from one node to the next.

Function of myelin

neuroglial cells responsible for the formation of myelin in the peripheral nervous system

function of Schwann cells

The gaps in the myelin sheath of the axons of peripheral neurons allow action potentials to 'jump' from node to node, thus increasing the speed of conduction (saltatory conduction)

function of the nodes of Ranvier

extension of a neuron that carries nerve impulses away from the cell body.

function of the axon

epidural space

What is the area labelled A called?

subarachnoid space

What is the area labelled B called?

central canal

What is the area labelled C called?

dura mater

Identify A.

arachnoid mater

Identify B.

pia mater

Identify C.

posterior gray horn

Identify

lateral gray horn

Identify

anterior gray horn

Identify

posterior white column

Identify A

lateral white column

Identify B

anterior white column

Identify C

anterior median fissure

Identify B

posterior median sulcus

Identify A

A

Which lettered area does not contain CSF?

ventral root

Identify A

dorsal root ganglion

Identify B

dorsal root

Identify C

ventral

The axons of motor neurons are located in the ___ root.

dorsal

The axons of sensory neurons are located in the ____ root.

cell bodies of sensory neurons

What are located here?

posterior

Somatic and visceral sensory nuclei are located in the ____ gray horn.

anterior

Somatic motor nuclei are located in the ___ gray horn.

lateral

Visceral motor nuclei are located in the ___ gray horn.

Ascending

_______ tracts carry sensory information from the spinal cord to the brain.

Descending

_______ tracts carry motor information from the brain to the spinal cord.

white

Myelinated axons are found in the ____ matter of the CNS.

cauda equina

Identify.

posterior median sulcus

A

central canal

B