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Flashcards in Brachial Plexus Deck (158)
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1

What roots form the middle trunk of the brachial plexus?

C7

2

What roots form the inferior trunk of the brachial plexus?

C8 and T1

3

Each trunk of the brachial plexus splits into what structures?

Anterior and posterior divisions

4

The three trunks of the brachial plexus pass over what structure going into the axilla?

The first rib

5

What do the anterior divisions of the brachial plexus supply?

Anterior compartments of the arm and forearm

6

What do the posterior divisions of the brachial plexus supply?

Posterior compartments of the arm and forearm

7

What roots make up the brachial plexus?

Anterior primary rami of C5-T1

8

What does the brachial plexus supply?

Upper extremities

9

In what direction does the brachial plexus travel?

Medial to lateral (over first rib into the axilla)

10

Brachial plexus roots combine to form what structures?

Trunks

11

Trunks of the brachial plexus divide into what structures?

Divisions

12

Divisions of the brachial plexus combine to form what structures?

Cords

13

Cords of the brachial plexus divide into what structures?

Terminal nerves

14

Dorsal scapular nerve carries fibers from what root?

C5 only

15

What muscles are supplied but the dorsal scapular nerve?

Rhomboid major and minor, levator scapulae

16

Each root of the brachial plexus receives a gray ramus communicans from what location?

Sympathetic trunk

17

The roots of the brachial plexus pass between what two muscles into what body triangle?

Between anterior and middle scalene; into posterior triangle

18

Where is the brachial plexus in relation to the subclavian artery?

Posterior and superior

19

What divisions form the lateral cord of the brachial plexus?

Anterior divisions of the superior and middle trunks

20

What fibers make up the lateral cord of the brachial plexus?

C5, C6, and C7

21

The cords of the brachial plexus are named for their relationship to what structure?

Axillary artery

22

What is the position of the lateral cord in relation to the axillary artery?

Lies lateral to the second part of it

23

Which two nerves are formed from roots of the brachial plexus before they combine to form trunks?

Dorsal scapular nerve, long thoracic nerve

24

What does the long thoracic nerve supply?

Serratus anterior muscle

25

What divisions form the medial cord of the brachial plexus?

Anterior division of the inferior trunk

26

What fibers make up the medial cord of the brachial plexus?

C8 and T1

27

Where does the medial cord of the brachial plexus lie in reference to the axillary artery?

Medial to the second part of it

28

What divisions form the posterior cord of the brachial plexus?

Union of the posterior division of all three trunks

29

What fibers make up the posterior cord of the brachial plexus?

C5, C6, C7, C8, and T1

30

Where does the posterior cord of the brachial plexus lie in reference to the axillary artery?

Posterior to the second part of it