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Flashcards in Brachial plexus Deck (37)
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1

the roots

 anterior rami of the spinal nerves that comprise the brachial plexus

2

spinal nerves 

At each vertebral level, paired spinal nerves arise. They leave the spinal cord via the intervertebral foramina of the vertebral column.

 

3

The roots of the brachial plexus are formed by

The roots of the brachial plexus are formed by the anterior rami of spinal nerves C5-T1 (the posterior divisions innervate the skin and musculature of the intrinsic back muscles).

After their formation, these nerves pass between the anterior and medial scalene muscles to enter the base of the neck.

4

trunks

form at the base of the neck- brachial plxus converge to form 3 trunks

5

name the three trunks

These structures are named by their relative anatomical location:

Superior trunk – a combination of C5 and C6 roots.

Middle trunk – continuation of C7.

Inferior trunk – combination of C8 and T1 roots.

6

divisions

Each trunk divides into two branches within the posterior triangle of the neck. One division moves anteriorly (toward the front of the body) and the other posteriorly (towards the back of the body).

 

Thus, they are known as the anterior and posterior divisions.

7

when the divisons have been formed we have 

cords

8

cords

Once the anterior and posterior divisions have entered the axilla, they combine together to form three cords

9

cords are names by their

position relative to the axillary artery.

10

three cords

lateral cord

 

posterior cord

 

medial cord

11

lateral cord is formed by

The anterior division of the superior trunk

The anterior division of the middle trunk

12

The posterior cord is formed by:

The posterior division of the superior trunk

The posterior division of the middle trunk

The posterior division of the inferior trunk

13

The medial cord is formed by:

The anterior division of the inferior trunk.

14

cords give rise to

major branches of the brachial plexus.

15

draw the brachial plexus

16

name the major branches (give acronymn first)

men are mean really usually (from superior to inferior)

 

  • musculocutaenous
  • axillary
  • median
  • radial
  • ulnar

17

story for learning the roots of branches

3 musketters

assassinate (gun fingers)

4 mice

5 rats

2 unicorns

 

18

roots of the musculocutaneous nerve

C5, C6, C7

19

Roots of the axillary nerve

C5, C6

20

Roots of the median nerve

C6-T1

21

Roots of the radial nerve 

C5-T1

22

Roots of the ulnar nerve

C8, T1

23

motor function of the musculocutaneous nerve

innervates the brachialis, biceps brachii, coracobrachilais muscles

24

motor function of the axillary nerve

Innervates the teres minor and deltoid muscle

25

motor function of the median nerve

Innervates most of the flexor muscles in the forearm, the thenar muscles, and the two lateral lumbricals associated with the index and middle fingers.

26

motor function of the radial nerve

Innervates the triceps brachii, and the muscles in the posterior compartment of the forearm (which are primarily, but not exclusively, extensors of the wrist and fingers).

27

motor function of the ulnar nerve

 Innervates the muscles of the hand (apart from the thenar muscles and two lateral lumbricals), flexor carpi ulnaris and medial half of flexor digitorum profundus.

28

sensory function of the ulnar nerve

 Innervates the anterior and posterior surfaces of the medial one and half fingers, and associated palm area.

29

sensory function of the radial nerve

 Innervates the posterior aspect of the arm and forearm, and the posterolateral aspect of the hand.

30

sensory function of the median nerve