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The Peripheral Nervous System - Chapter 13 - Part 3

front 1

How many pair of cranial nerves are there?

back 1

12 pair

front 2

How many pair of spinal nerves are there?

back 2

31 pair

front 3

How many cervical nerves are there and name them.

back 3

There are 8 cervical nerves. C1-C8

front 4

How many thoracic nerves are there and name them.

back 4

There are 12 thoracic nerves. T1-T12

front 5

How many lumber nerves are there and name them.

back 5

There are 5 lumbar nerves. L1-L5

front 6

How many sacral nerves are there and name them.

back 6

There are 5 sacral nerves. S1-S5

front 7

How many coccygeal nerves are there and name them.

back 7

There is 1 coccygeal nerve. C1

front 8

How many plexus are there and name them.

back 8

There are 4 plexus.
1. Cervical plexus
2. Brachial plexus
3. Lumbar plexus
4. Sacral plexus

front 9

Which region does NOT have a plexus?

back 9

The thoracic

front 10

Each spinal nerve connects to the spinal cord via two roots. Name these two roots.

back 10

1. Ventral root
2. Dorsal root

front 11

Ventral roots contain ____ fibers from the ventral horn motor neurons.

back 11

motor (efferent)

front 12

The fibers from the ventral root innervate ____?

back 12

skeletal muscles

front 13

Dorsal roots contain ____ fibers from sensory neurons in the dorsal root ganglia.

back 13

sensory (afferent)

front 14

Dorsal roots conduct impulses (to or from) peripheral receptors?

back 14

from

front 15

Dorsal and ventral roots unite to form ____, which then emerge from the vertebral column via the ____ ____.

back 15

spinal nerves
intervertebral foramina

front 16

Each spinal nerve branches into mixed ____.

back 16

rami

front 17

All ventral rami except ____ form interlacing nerve networks called ____.

back 17

T2-T12
plexuses

front 18

The back is innervated by ____ rami via several branches.

back 18

dorsal

front 19

The ventral rami of T2-T12 are ____ nerves that supply muscles of the ____, ____, and ____.

back 19

intercostal
ribs
anterolateral thorax
abdominal wall

front 20

White rami do NOT extend below ____ or above ____.

back 20

below L2
above T1

front 21

The cervical plexus is formed by ____ rami of ____.

back 21

ventral
C1-C4

front 22

Cervical plexus innervates skin and muscles of the ____, ____, ____, and ____.

back 22

neck
ear
back of head
and shoulders

front 23

The ____ nerve is the major motor and sensory nerve of the ____. It receives fibers from C__ -C___.

back 23

phrenic nerve
diaphragm
C3-C5

front 24

Name the four nerves of the cutaneous branches (superficial) and their spinal roots (ventral rami)

back 24

lesser occipital, C2 (C3)
greater auricular, C2 C3
transverse cervical, C2 C3
supraclavicular (medial, intermediate, and lateral) C3 C4

front 25

The lesser occipital nerve serves the skin on ____

back 25

skin on posterolateral aspect of neck

front 26

The greater auricular nerve serves the skin of ____

back 26

skin of ear, skin over parotid gland

front 27

The transverse cervical nerve serves the skin on ___

back 27

anterior and lateral aspect of neck

front 28

The supraclavicular nerve serves the skin of ____

back 28

shoulder and clavicular region

front 29

Name the three nerves of motor branches (deep)

back 29

ansa cervicalis (superior and inferior roots), C1-C2
segmental and other muscular branches, C1-C5
phrenic, C3-C5

front 30

The ansa cervicalis nerve serves the ____

back 30

infrahyoid muscles of neck

front 31

The segmental nerve serves the ____

back 31

deep muscles of neck

front 32

The phrenic nerve serves the ____

back 32

diaphragm

front 33

The brachial plexus is formed by ____ rami of ____-____ and ____ (and often ____ and ____)

back 33

ventral rami
C5-C8 and T1
and often C4 and T2

front 34

The brachial plexus gives rise to the nerves that innervate the ____

back 34

upper limb

front 35

What are the four major branches of the brachial plexus?

back 35

Roots
Trunks
Divisions
Cords

front 36

There are ____ roots (ventral rami). They are located at ____-____.

back 36

5 roots
C5-T1

front 37

Name the three trunks of the brachial plexus

back 37

Upper
Middle
Lower

front 38

Name the two divisions of the brachial plexus

back 38

anterior and posterior

front 39

Name the three cords of the brachial plexus

back 39

Lateral
Medial
Posterior

front 40

Name 5 nerves of the brachial plexus

back 40

Axillary
Musculocutaneous
Median
Ulnar
Radial

front 41

The axillary nerve innervates ____, ____, and ____.

back 41

deltoid, teres minor, and skin and joint capsule of the shoulder

front 42

The musculocutaneous nerve innervates ___, ___, and ___.

back 42

biceps brachii, and brachialis and skin of lateral forearm

front 43

The median nerve innervates the ____, ____, and ____.

back 43

skin, most flexors and pronators in the forearm and some intrinsic muscles of the hand

front 44

The ulnar nerve supplies the ____, ____, ____ and ____.

back 44

flexor carpi ulnaris, part of the flexor digitorum profundus, most intrinsic muscles of the hand, and skin of medial aspect of hand

front 45

The radial nerve innervates ____, ____ and ____.

back 45

essentially all extensor muscles, supinators, and posterior skin of limb