Anatomy (Axilla and Brachial Plexus - 11/3) Flashcards Preview

Skin MS: Week 2 > Anatomy (Axilla and Brachial Plexus - 11/3) > Flashcards

Flashcards in Anatomy (Axilla and Brachial Plexus - 11/3) Deck (41)
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1

Axillary Sheath

Continuation of fascia associated with anterior/middle scalene muscles -- continues laterally as tubular sheath surrounding nerves of brachial plexus/axillary artery (not axillary vein)

2

Anterior Wall of Axilla

Pec major, minor, clavipectoral fascia

3

Posterior Wall of Axilla

Subscapularis, teres major, Lat dorsi

4

Medial Wall of Axilla

First 4 ribs, intercostal muscles, upper part of serratus anterior

5

Lateral Wall of Axilla

Humerus, coracobrachialis, biceps brachii

6

Cervicoaxillary canal

Bound by clavicle, scapula, 1st rib. Contains axillary a/v, brachial plexus

7

Intercostobrachial nerve

Lateral branch of second intercostal nerve (T2), supplies lateral chest wall --> medial arm

8

Branches of Axillary Artery

1 - Superior Thoracic
2 - Thoracoacromial Trunk
Lateral Thoracic
3 - Subscapular artery (-- circumflex scapular artery, thoracodorsal artery)
Posterior Circumflex humeral artery
Anterior circumflex artery

9

Lateral thoracic artery -->

Lateral portion of breast

10

Circumflex scapular artery pathway

From subscapular artery --> enter infraspinous fossa, form anastomosis w/ suprascapular artery

11

Thoracodorsal artery pathway

From subscapular artery --> join with thoracodorsal nerve --> latissimus dorsi

12

Posterior circumflex humeral artery pathway

Accompanies axillary nerve through quadrilateral space, encircles humerus to anastomose w/ anterior circumflex humeral artery

13

Posterior Triangle

Trapezius, sternocleidomastoid, clavicle (brachial plexus here + axilla)

14

5 Major branches of brachial plexus (from top to bottom)

Musculocutaneous
Axillary
Radial
Median
Ulnar

15

Branches from lateral cord

Lateral pectoral nerve

musculocutaneous nerve
lateral root --> median nerve (with medial root of medial cord)

16

Branches from posterior cord

upper/lower subscapular nerves
thoracodorsal nerve

axillary nerve
radial nerve

17

Branches from Medial cord

Medial pectoral nerve
medial brachial cutaneous nerve
medial antebrachial cut. nerve

ulnar
Medial root --> median nerve (with lateral root of lateral cord)

18

Thoracodorsal nerve innervates _______

Latissimus dorsi

19

Medial Pectoral nerve innervates

Pectoralis major and minor

20

Upper/Lower subscapular nerves innervates ____

subscapularis + Teres major

21

Lateral pectoral nerve innervates ________

pectoralis major

22

Lateral cord spinal nerve derivatives

C5,6,7

23

Posterior Cord spinal nerve derivatives

C5,6,7,8,T1 --> extensors! (except brachioradialis = forearm flexor)

24

Medial cord spinal nerve deri.

C8, T1

25

Musculocutaneous Nerve SCD

C5,6,7 (from lateral cord)

26

Median Nerve SCD

C5,6,7 (From Lateral cord) AND C8,T1 (from medial cord)

27

Ulnar nerve SCD

C8/T1

28

Axillary / Radial Nerves SCD

C5,6,7,8,T1 --> Extensors

29

Upper Brachial Plexus Injury

Erb-Duchenne Palsy
Injury to C5,C6 --> Supply lateral rotators (infraspinatus, teres minor)/Abductors of arm (supraspinatus, deltoid)
Increase in angle between neck and shoulder
Fall, delivery of baby
Adducted arm, medial roation or arm (hand faces backward), extended elbow
"Waiter's Tip" Hand

30

Lower Brachial Plexus Injury

Klumpke Paralysis
Less common
Upper limb pulled up (falling and try to catch self, or delivery of baby)
Injury to C8-T1 --> Ulnar nerve - major influence of hand --> weakness/atrophy of hand muscles
Median nerve (also hand muscles)
"Claw" Hand