The Peripheral Nervous System - Chapter 13 - Part 3

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Human Anatomy & Physiology, 8e Elaine Marieb & Katja Hoehn
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College: Second year
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1

How many pair of cranial nerves are there?

12 pair

2

How many pair of spinal nerves are there?

31 pair

3

How many cervical nerves are there and name them.

There are 8 cervical nerves. C1-C8

4

How many thoracic nerves are there and name them.

There are 12 thoracic nerves. T1-T12

5

How many lumber nerves are there and name them.

There are 5 lumbar nerves. L1-L5

6

How many sacral nerves are there and name them.

There are 5 sacral nerves. S1-S5

7

How many coccygeal nerves are there and name them.

There is 1 coccygeal nerve. C1

8

How many plexus are there and name them.

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

9

Which region does NOT have a plexus?

The thoracic

10

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

1. Ventral root
2. Dorsal root

11

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

motor (efferent)

12

The fibers from the ventral root innervate ____?

skeletal muscles

13

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

sensory (afferent)

14

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

from

15

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

spinal nerves
intervertebral foramina

16

Each spinal nerve branches into mixed ____.

rami

17

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

T2-T12
plexuses

18

The back is innervated by ____ rami via several branches.

dorsal

19

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

intercostal
ribs
anterolateral thorax
abdominal wall

20

White rami do NOT extend below ____ or above ____.

below L2
above T1

21

The cervical plexus is formed by ____ rami of ____.

ventral
C1-C4

22

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

neck
ear
back of head
and shoulders

23

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

phrenic nerve
diaphragm
C3-C5

24

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

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

25

The lesser occipital nerve serves the skin on ____

skin on posterolateral aspect of neck

26

The greater auricular nerve serves the skin of ____

skin of ear, skin over parotid gland

27

The transverse cervical nerve serves the skin on ___

anterior and lateral aspect of neck

28

The supraclavicular nerve serves the skin of ____

shoulder and clavicular region

29

Name the three nerves of motor branches (deep)

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

30

The ansa cervicalis nerve serves the ____

infrahyoid muscles of neck

31

The segmental nerve serves the ____

deep muscles of neck

32

The phrenic nerve serves the ____

diaphragm

33

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

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

34

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

upper limb

35

What are the four major branches of the brachial plexus?

Roots
Trunks
Divisions
Cords

36

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

5 roots
C5-T1

37

Name the three trunks of the brachial plexus

Upper
Middle
Lower

38

Name the two divisions of the brachial plexus

anterior and posterior

39

Name the three cords of the brachial plexus

Lateral
Medial
Posterior

40

Name 5 nerves of the brachial plexus

Axillary
Musculocutaneous
Median
Ulnar
Radial

41

The axillary nerve innervates ____, ____, and ____.

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

42

The musculocutaneous nerve innervates ___, ___, and ___.

biceps brachii, and brachialis and skin of lateral forearm

43

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

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

44

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

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

45

The radial nerve innervates ____, ____ and ____.

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