[Muscles] Anterior/medial wall of axilla and anterior arm Flashcards
Pectoralis major
Clavicular head origin: anterior surface medial half of the clavicle
Sternal head origin: Anterior surface of sternum, 1st 7 costal cartilages, sternal end of 6th rib, external oblique aponeurosis
Insertion: lateral lip inter tubercular groove (sulcus) of humerus
Innervation: medial and lateral pectoral N
BS: thoracoacromial artery - pectoral branch
Action: ADD and medial rotation of arm at GHJ
CH: flexion of ext arm
SH: extension of flex arm
Pectoralis minor
Origin: anterior surface of the 3rd to 5th ribs
Insertion: Superior surface of coracoid
process
Innervation: medial pectoral N
BS: thoracoacromial artery - pectoral branch
Action: Pulls tip of shoulder down
Protracts scap
Subclavius
Origin: Junction between the 1st rib and costal cartilage
Insertion: inferior surface of middle third of clavicle
Innervation: Nerve to subclavius
BS: Thoracromial artery - clavicular branch
Action: pulls tip of shoulder down
Stabilizes SC J
Serratus Anterior
Origin: Lateral surface of the 8 or 9 ribs and deep fascia
Insertion: costal surface of medial border of scapula
Innervation: Long thoracic nerve: BS: Lateral thoracic artery Action: protracts scapula Holds scapula against thoracic wall Upward rotation of scapula
Biceps Brachii
Short head origin: coracoid process of scapula
Long head origin: supraglenoid tubercle of scapula
Insertion: radial tuberosity
Innervation: Musculocutaneous N BS: brachial artery Action: powerful supinator of forearm Flexor of supinated forearm Arm flexion at GHJ
Coracobrachialis
Origin: Coracoid process of scapula
Insertion: medial surface of humerus-mid shaft
Innervation: Musculocutaneous N
BS: brachial artery
action: Flex and ADD of arm at GHJ
Brachialis
Origin: Distal anterior humerus
Insertion: Tuberosity of the ulna
Innervation: Musculocutaneous N
BS: brachial artery
Action: powerful flexor of forearm at the elbow
