Brachial Plexus

Question 1

list the hierarchy

Answer 1

5 roots
3 trunks
6 divisions
3 cords
5 terminal nerve branches

Question 2

roots

Answer 2

5 roots off spinal cord
C5-T1

3 nerve terminals

Question 3

trunks

Answer 3

3 trunks created by the 5 roots
superior C5-C6
middle C7
inferior C8-T1

2 nerve terminals

Question 4

divisions

Answer 4

6 total
3 anterior
3 posterior

each of the 3 trunks gives off 2 divisions, one anterior and one posterior

Question 5

cords

Answer 5

3 cords created by joining of the 6 divisions
lateral
posterior
medial

Question 6

how are the cords named

Answer 6

in reference to their position to the brachial artery

Question 7

lateral cord

Answer 7

2 divisions form this

the anterior divisions from the superior and middle trunk

Question 8

posterior cord

Answer 8

made from 3 divisions

all the posterior divisions from all 3 trunks forms this cord

Question 9

medial cord

Answer 9

made from 1 division

anterior division of inferior trunk creates this cord

Question 10

trunks are formed where?

Answer 10

before the brachial plexus runs behind and below the clavicle

Question 11

terminal branches

Answer 11

5 terminal nerves

1. musculotaneous
2. axillary
3. median
4. radial
5. ulnar

Question 12

lateral cord nerves

Answer 12

lateral pectoral
musculotaneous
lateral-median nerve

Question 13

lateral cord mnemonic

Answer 13

Let
Me
Lift

Question 14

lateral cord innervation levels

Answer 14

C5-C7

Question 15

lateral cord: terminal branches

Answer 15

musculotaneous

lateral-median nerve

Question 16

medial cord nerves

Answer 16

medial pectoral
medial brachial cutaneous
medial antebrachial cutaneous
medial-median nerve
ulnar nerve

Question 17

medial cord mnemonic

Answer 17

Many
Muscles
Move
My
Uppercut

4/5 are have medial in name

Question 18

medial cord: terminal branches

Answer 18

medial-median nerve

ulnar nerve

Question 19

medial cord innervation levels

Answer 19

4/5 are C8-T1

medial brachial cutaneous is special T1

Question 20

posterior cord nerves

Answer 20

upper scapular
lower scapular
thoracodorsal
radial
axillary

Question 21

posterior cord: terminal branches

Answer 21

radial

axillary

Question 22

posterior cord mnemonic

Answer 22

ULTRA

Question 23

posterior cord innervation levels

Answer 23

upper/lower scapular C5

thoracodorsal C6-C7

radial C5-T1

axillary C5-C6

Question 24

brachial plexus mnemonic

Answer 24

Round Trip to D.C. is $355

Question 25

$355 refers to?

Answer 25

number of nerves off each of the 3 cords in alphabetical order (L-M-P)

Question 26

roots: nerves

Answer 26

3
dorsal scapular
1st intercostal
long thoracic

Question 27

dorsal scapular nerve

Answer 27

directly off C5 root

Question 28

1st intercostal nerve

Answer 28

directly off root T1

Question 29

long thoracic nerve

Answer 29

directly off roots C5-C6-C7

Question 30

long thoracic nerve mnemonic

Answer 30

5, 6, 7 wings of heaven

innervates the serratus anterior muscle, if this muscle fails/weak —-> scapula will wing

Question 31

trunks: nerves

Answer 31

2 terminal nerves here

suprascapular
subclavius

**both off superior trunk

Question 32

superior trunk: innervation level

Answer 32

suprascapular nerve

nerve to subclavius muscle

both C5-C6

Question 33

middle subscapular nerve

Answer 33

another name for the thoracodorsal nerve off of the posterior cord