Brachium Flashcards
shoulder movements
forward flexion (sagittal plane)
extension (post sagittal plane)
abduction (coronal plane or scapular plane)
adduction
horizontla abduction (horizontal plane starting at 90* flexion)
horizontal adduction
int & ext rotation (medial and lateral rotation)
each of four articulation adds to shoulder motion: glenohumeral, screamioclavicular, sternoclavicular, and scapulothoracic
pectoralis major attachments
clavicular head: from the anterior surface of medial half of the clavicle
sternocostal head: anterior surface of sternum and first 6 costal cartilage and from aponeurosis of external oblique
distal attachment: lateral lip of intertubercular groove of humerus
pectorals major action
clavicular head: flex and adduct humerus across middle
sternal head: adduct and internal rotate humerus if arm is in a flexed and abducted position
reverse action: elevates thorax, accessory muscle in respiration
pectorals major innervation
medial pectoral n.: C8, T1
lateral pectoral n: C5,6,7
aponeurosis
collagen fibers organized in a certain direction
distal attachment of pectorals major
lateral lip intertubercular groove of humerus
pectoralis minor location
from anterior surface exterior surface of ribs 3-5
pectoralis minor attachment
distal attachment to upper surface of coracoid process
pectoralis minor actions
stabilizes scapula by drawing it inferiorly and anteriorly against the thoracic wall, depresses the tip of the shoulder
pectoralis minor innervations
medial pectoralis n.: C8, T1
and lateral pectoralis n.: C5,6,7
subclavius muscle location
from junction of 1st rib and its costal cartilage to inferior surface of middle 1/3 of clavicle
subclavius action
depresses and anchors the clavicle
subclavius innervation
nerve to subclavius (C5,6)
axillary artery location
continuation of subclavian artery (changes at lateral border of 1st rib)
axillary artery portions
1st portion: supreme thoracic artery
-tucked really high up between rib 1 and 2
2nd portion : two branches
- thoracoacromial trunk (4 branches: acromial, clavicular, pectoral, deltoid artery)
- lateral thoracic artery (feeds pectoral muscles)
3rd portion: three branches
- subscapular artery (circumflex scapular and thoracodorsal artery)
- anterior humeral circumflex artery
- posterior humeral circumflex artery
brachial artery location
begins at inferior border of teres major (continuation of axillary artery)
branches of brachial artery
- profunda brachii artery
- travels with radial nerve in radial groove and divides into:
- –radial collateral artery (anastomosis with radial recurrent artery) and
- –middle collateral artery (anastomosis with posterior interosseous recurrent artery) - superior ulnar collateral artery (anastomosis with posterior ulnar recurrent artery)
- inferior ulnar collateral artery (anastomosis with anterior ulnar recurrent artery)