Anterior axio-appendicular muscles Flashcards
Pectoralis major insertion
Lateral lip of intertubercular sulcus of humerus
Pectoralis major origin
Clavicular head - anterior surface of medial half of clavicle
Sternocostal head - antrior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle
Pectoralis major innervation
Lateral and medial pectoral nerves
Clavicular head - C5, C6
Sternocostal head - C7, C8, T1
Pectoralis major action
Adducts and medially rotates shoulder joint
Draws scapula anteriorly and inferiorly
Acting alone - clavicular head flexes shoulder joint and sternocostal head extends it from the flexed position
Pectoralis minor origin
3rd-5th ribs near their costal cartilages
Pectoralis minor insertion
Medial border and superior surface of coracoid process of scapula
Pectoralis minor innervation
Medial pectoral nerve (C8, T1)
Pectoralis minor action
Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall
Subclavius origin
Junction of 1st rib and its costal cartilage
Subclavius insertion
Inferior surface of middle third of clavicle
Subclavius innervation
Subclavian nerve (C5, C6)
Subclavius action
Anchors and depresses clavicle
Serratus anterior origin
External surfaces of lateral parts of 1st-8th ribs
Serratus anterior insertion
Anterior surface of medial border of scapula
Serratus anterior innervation
Long thoracic nerve (C5, C6, C7)