O & I Shoulder, Posterior arm, & Pectoral Region Flashcards
Serratus Ant. is in here, move it eventually
Origin: Pectoralis Major
Clavicular Head: anterior surface of medial half of clavicle
Sternocostal Head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle
Insertion: Pectoralis Major
Lateral lip of inter tubercular sulcus of humerus
Innervation: Pectoralis Major
Lateral and medial pectoral nerves; Clavicular head (C5,C6), and Sternocostal head (C7, C8, T1)
Action: Pectoralis Major
Adducts and medially rotates humerus; draws the scapula anteriorly and inferiorly.
Acting alone, the clavicular head flexes the humerus and the sternocostal head extends the humerus from a flexed position
Origin: Pectoralis Minor
3rd - 5th ribs near their costal cartilages
Insertion: Pectoralis Minor
Medial boarder and superior surface of coracoid process of scapula
Innervation: Pectoralis Minor
Medial Pectoral Nerve (C8, T1)
Action: Pectoralis Minor
Stabilizes the scapula by drawing it inferiorly and anteriorly against thoracic wall
Origin: Subclavius
Junction of 1st rib and its costal cartilage
Insertion: Subclavius
Inferior surface of middle third of clavicle
Innervation: Subclavius
Nerve to subclavius (C5,C6)
Action: Subclavius
Anchors and depresses clavicle
Origin: Serratus Anterior
External surfaces of lateral parts of 1st - 8th ribs
Insertion: Serratus Anterior
Anterior surface of medial border of scapula
Innervation: Serratus Anterior
Long Thoracic Nerve (C5, C6, C7)
Action: Serratus Anterior
Protracts the scapula and holds it against thoracic wall; rotates scapula
Origin: Deltoid
Lateral 1/3 of clavicle; acrominon and spine of scapula
Insertion: Deltoid
Deltoid tuberosity of humerus
Innervation: Deltoid
Axillary nerve (C5, C6)