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Brachial Plexus
anatomy of the shoulder nerves
30
Anatomy
Graduate
02/12/2012

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Cards

Term
Brachial Plexus Roots
Definition
The Anterior Rami of C5 through T1 spinal nerves
Term
Brachial Plexus Trunks
Definition
C5-C6 form upper trunk
C7 forms the middle trunk
C8-T1 form the lower trunk
Term
C5 root
Definition
Dorsal Scapular nerve
Phrenic nerve
contributes to the long thoracic nerve
Combines with C6 to form upper trunk
Term
Upper trunk
Definition
formed from C5 and C6
suprascapular nerve
nerve to subclavius
Term
C6 root
Definition
combines with C5 to form the upper trunk
contributes to long thoracic nerve
Term
divisions
Definition
each trunk splits into 2 divisions: the anterior and posterior
Term
C7 root
Definition
becomes the middle trunk
sometimes contributes to long thoracic nerve
Term
C8 root
Definition
combines with T1 to become the lower trunk
Term
T1 root
Definition
first intercostal nerve
combines with C8 to form lower trunk
Term
cords
Definition
the 6 divisions of the trunks then recombine to form cords:
lateral cord
medial cord
posterior cord
Term
posterior cord
Definition
formed from the posterior divisions of all three trunks
upper subscapular nerve
thoracodorsal nerve
lower subscapular nerve
axillary nerve
contributes to radial nerve
Term
lateral cord
Definition
formed from the anterior divisions of the upper and middle trunks
lateral pectoral nerve
musculocutaneous nerve
lateral root of median nerve
Term
medial cord
Definition
continuation of the anterior division of the lower trunk
medial pectoral nerve
medial root of medial nerve
medial cutaneous nerve of arm
medial cutaneous nerve of forearm
ulnar nerve
Term
dorsal scapular nerve
Definition
from C5 root
rhomboid muscle, levator scapulae
Term
long thoracic nerve
Definition
from roots of C5, C6, sometimes C7
serratus anterior
Term
nerve to subclavius
Definition
from upper trunk
subclavius muscle
Term
suprascapular nerve
Definition
from upper trunk
supraspinatus muscle, infraspinatus muscle
Term
lateral pectoral nerve
Definition
from lateral cord
pectoralis major (along with medial pectoral nerve)
Term
musculocutaneous nerve
Definition
from lateral cord
coracobrachialis, brachialis, biceps brachii
Term
lateral root of median nerve
Definition
from lateral cord
contributes to median nerve
Term
upper subscapular nerve
Definition
from posterior cord
subscapularis (superior part)
Term
thoracodorsal nerve
Definition
from posterior cord
latissimus dorsi
Term
lower subscapular nerve
Definition
from posterior cord
subscapularis (inferior portion)
teres major
Term
axillary nerve
Definition
from posterior cord
has two branches: anterior & posterior
anterior: deltoid
posterior: teres minor and deltoid
Term
radial nerve
Definition
from posterior cord
triceps brachii, supinator, anconeus, brachioradialus, extensor muscles of the forearm
Term
medial pectoral
Definition
from medial cord
pectoralis major, pectoralis minor
Term
medial nerve
Definition
from medial cord, lateral cord
Term
medial cutaneous nerve of arm
Definition
from medial cord
Term
medial cutaneous nerve of forearm
Definition
from medial cord
Term
ulnar nerve
Definition
from medial cord
flexor carpi ulnaris, medial bellies of digitorum profundus, intrinsic hand muscles (except thenar and lumbricals)
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