unit 5: brachial plexus, intro thru lat cord

Question 1

• brachial plexus is formed by ANTERIOR primary rami of ___ thru ___, with some fibers from C4 and/or T2
• travels laterally over rib _ into the axilla

Answer 1

C5
T1
1

Question 2

roots -> ___ -> divisions->___ –>terminal nerves

Answer 2

trunks

cords

Question 3

each ROOT receives a ___ __ ___ from the sympathetic trunk

Answer 3

gray ramus communicans

Question 4

ROOTS pass bt anterior & middle ___ muscles into posterior triangle, posterior & superior to ____ artery

Answer 4

scalene

subclavian

Question 5

roots of C5 & C6 combine to from the ___ trunk

Answer 5

superior

Question 6

roots of C7 stays alone to form ___ trunk

Answer 6

middle

Question 7

roots of C8 & T1 combine to form ___ trunk

Answer 7

inferior

Question 8

each trunk splits into an ___ & ___ division, each of which supplies its respective compartment of the arm and forearm

Answer 8

anterior

posterior

Question 9

cords are named for their relationship to the __ artery

Answer 9

axillary

Question 10

LATERAL cord is formed by the ANTERIOR divisions of the __ & ___ trunks

Answer 10

superior

middle

Question 11

lateral cord contains fibers from __-__, and lies ___ to second part of axillary artery

Answer 11

C5-C7

lateral

Question 12

MEDIAL cord is formed by ANTERIOR division of __ trunk, contains fibers from __ & __, and lies medial to the second part of axillary artery

Answer 12

inferior

C8 & T1

Question 13

POSTERIOR cord is formed by the union of the POST division of ___ ___ trunks, contains fibers from __-__ and lies posterior to the second part of the axillary artery

Answer 13

all three

C5-T1

Question 14

__ ___ nerve branches off of the C5 root, containing fibers from C5 only

Answer 14

dorsal scapular

Question 15

three muscles supplied by dorsal scapular n.

Answer 15

levator scapula (fibers also from C3 & C4)
rhomboid major
rhomboid minor

Question 16

__ __ nerve is formed by the ROOTs of C5-7 & contains fibers from them

Answer 16

long thoracic

Question 17

muscle supplied by long thoracic nerve

Answer 17

serratus anterior

Question 18

____ nerve branches off the sup trunk, and contains fibers from C5 & C6

Answer 18

suprascapular

Question 19

2 muscles supplied by suprascapular nerve

Answer 19

supraspinatus

infraspinatus

Question 20

nerve that branches off the sup trunk, contains fibers from C5 & C6, and supplies SUBCLAVIUS

Answer 20

nerve to subclavius

Question 21

nerve that branches off the lateral CORD, contains fibers from C5-C7, and supplies pec major (which also is innerv by med pec nerve)

Answer 21

lateral pectoral nerve

Question 22

one of two terminal branches of lateral CORD, contains fibers from C5-C7
-other terminal branch is median n.

Answer 22

musculocutaneous nerve

Question 23

muscles of anterior arm that are supplied by musculocutaneous

Answer 23

coracobrachialis (nerve pierces belly)
biceps brachii
brachialis

Question 24

the musculocutaneous nerve continues bt biceps brachii and brachialis into the forearm to become this nerve, which supplies skin over lateral forearm NOT the hand

Answer 24

lateral cutaneous nerve of the forearm