Axilla and Brachial Plexus Flashcards
Axilla: ________shaped region btw arm and chest
- pec major and pec minor= ____ wall
- _______, _______, _______= posterior wall
- serratus anterior=________ wall
- ___________ of humerus= lateral wall -skin and fascia of armpit= base
pyramidal
anterior wall
latissimus dorsi
teres major
subscapularis
medial wall
intertubercular sulcus
Axilla Contents:
- axillary ______
- axillary a and ______ _______.
- axillary v and _______ (outside sheath).
- fat and connective tissue -_______nn
sheath
brachial plexus
lymphatic
cutaneous
Pectoral lymphatics location?
anterior thoracic wall and most of breast
Subscapular lymphatics location?
posterior thoracic wall and scapular region
Humeral lymphatics location?
UL except for the portion along the cephalic v
Central lymphatics location?
from pectoral, subscapular, humeral to apical
Apical lymphatics location?
from pectoral, subscapular, humeral, apical and proximal cephalic c nodes
Left lymphatics drain by…
thoracic duct to left subclavian v
Right lymphatics drain by…
right jugular lymphatic trunk
Axillary a 1st
btw 1st rib and pec minor m
-give off superior thoracic a
Axillary a 2nd
deep to pec minor m
-gives off thoracoacromial and lateral thoracic aa
Axillary a 3rd
btw pec minor and teres major mm
-gives off subscapular, anterior circumflex humeral, and posterior circumflex humeral aa
Brachial Plexus rami and general mm innervation
rami C5-T1
innervates all UL mm except trap
8 cervical nn but only ____ cervical vertebrae
7
C1-C7nn emerge _____ C1-C7 vertebrae
above
____ emerge below C7 vertebae
C8 n
rest of nn emerge____ vertebrae of same number
below
Rami (__) emerge in _____ neck
Trunks (__) emerge in ____ neck
Divisions (__) split off behind _____
Cords (__) form in axillary region
Branches (__) split off in upper arm
5, upper
3, lower
6, clavicle
3
5
Musculocutaneaus N (C__- C__)
formed from _______ cord
passes thru ____________m
enteres biceps brachii and _________mm
Major n of the _______ arm
innervates ________, _________, and 1/2 of ________m
C5-C7
lateral
coracobrachialis
brachialis
anterior
coracobrachiis, biceps, 1/2 of brachialis m
Median N (C___-T___)
formed from 1/2 _____cord and 1/2 _____cord
passes ______ to arm mm
major n of ______ ______
innervates most of _______ _____, 3 ______ _______, and 1st 2 ______ in hand
C5-T1
lateral cord and medial cord
medial
anterior forearm
the anterior forearm, 3 thenar (thumb) eminence mm, lumbricals
Ulnar N (C___-T____)
formed from _____ cord
runs behind ______ ______
major n of the _____
innervates most of the mm of the hand. _____, and ulnar 1/2 _____ in forearm
C8-T1
medial
medial epicondyle
hand
FCUmm
FDPm
Axillary N (C___-C___)
formed from ______ cord
circles behind ________ in _______ space
innervates _____ and ______
C5-C6
posterior
humerus in quadrangular space
deltoid and teres minor mm
Radial N (C____-T_____)
formed from ______ cord
passes posterior to _______ in radial groove and within ______ _____
major n of _______ arm and _______
innervates all mm in ____ ______ and 1/2 of ______m
C5-T1
posterior
humerus, triangual interval
posterior arm and forearm
both regions, brachialis
Upper plexus nn, Pectoral nn, Lower plexus nn
form directly from rami, trunks, and cords
innervate remaing UL mm and skin
Upper Plexus NN
________= rhomboid and levator scapulae mm
__________= serratus anterior m
___________= supraspinatus and infraspinatous mm
Dorsal Scapular n (C5)
Long Thoracic n (C5-C7)
Surascapular n (C5-C6)
Pectoral NN
_______=pectoarli major m
________=pectoralis major and minor mm
Lateral Pectoral n (C5-C7)
Medial Pectoral (C8-T1)
Lower Plexus NN
_______= subscapularis m
______=latissimus dorsi m
_________=subscapularis and teres major mm
Upper Subscapular (C5-C6)
Thoracodorsal n (C6-C8)
Lower Subscapular n (C5-C6)
Additional NN
_______ =subclavius m
______= sensory to medial arm
_________=sensory to medial forearm
Nerve to subclavius m (C5-C6)
Medial brachical cutaneous n (C8-T1)
Medial antibrachial cutaneous n (C8-T1)
