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Flashcards in Brachial Plexus Part 1 Deck (33)
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1

Which anterior primary rami form the brachial plexus in order to supply the upper extremities?

C5-T1 (may also receive some fibers from C4 and/or T2)

2

Which rib does the brachial plexus travel across to reach the axilla?

rib 1

3

What do roots combine to form?

trunks

4

What do trunks divide into?

divisions

5

What do divisions form?

cords

6

What do cords divide into?

terminal nerves

7

T/F: Each root of the brachial plexus receives a white ramus communicans from the sympathetic trunk.

False; should say gray ramus communicans

8

Which scalene muscles do the roots of the brachial plexus pass between going into the posterior triangle?

anterior and medial scalene

9

How do the roots of the brachial plexus pass the subclavian artery?

posterior and superior

10

Which roots combine to form the superior trunk? middle trunk? inferior trunk?

C5 and C6;
C7;
C8 and T1

11

What structure do the trunks of the brachial plexus pass over to get into the axilla?

rib 1

12

What does each trunk of the brachial plexus split into?

anterior and posterior divisions

13

T/F: anterior divisions of the brachial plexus will supply the anterior compartments while the posterior divisions will supply the posterior compartments of the arm and forearm.

True

14

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

axillary artery

15

What is the lateral cord of the brachial plexus formed by?

anterior divisions of the superior and middle trunks

16

T/F: the lateral cord contains fibers from C4, C5, and C6.

False; should say C5-C7

17

Which cord of the brachial plexus lies lateral to the second part of the axillary artery?

lateral cord

18

Which cord of the brachial plexus is formed by the anterior division of the inferior trunk?

medial cord

19

T/F: the medial cord contains fibers from C7, C8 and T1.

False; just C8 and T1 typically

20

What cord lies medial to the second part of the axillary artery?

medial cord

21

Which cord of the brachial plexus is formed by all three trunks?

posterior cord

22

What roots cord levels supply fibers to the posterior cord?

C5-T1

23

Which cord lies posterior to the second part of the axillary artery?

posterior cord

24

What two nerves are formed from the roots of the brachial plexus?

dorsal scapular nerve and long thoraic nerve

25

What nerve is formed from the fibers from C5 only?

dorsal scapular nerve

26

What muscles are supplied by the dorsal scapular nerve?

levator scapula, rhomboid minor, and rhomboid major

27

What muscle is supplied by the dorsal scapular nerve and also receives fibers from C3 and C4?

levator scapula

28

What roots from the long thoracic nerve? What muscle is supplied?

C5-C7;
serratus anterior

29

What do all of the muscles supplied by the dorsal scapular nerve and the long thoracic nerve have in common?

all attach to medial border of scapula

30

What two nerves branch off of the superior trunk of the brachial plexus?

suprascapular nerve and nerve to the subclavius