Anterior Axio-Appendicular Flashcards
What is the insertion of pectoralis major?
Lateral lip of intertubercular sulcus (groove) of humerus
What is the origin of pectoralis major?
Clavicular head: anterior surface of medial half of clavicle
Sternocostal head: anterior surface of sternum, superior 6 costal cartilages, aponeurosis of external oblique muscle
What is the innervation of pectoralis major?
Lateral and medial pectoral nerves clavicular head (C5, C6); sternocostal head (C7, C8, T1)
What are the actions of pectoralis major?
Adducts & medially rotates shoulder joint, draws scapula anteriorly & inferiorly
Alone: clavicular head flexes shoulder joint & sternocostal head extends from flexed position
What is the origin of pectoralis minor?
3rd-5th ribs near their costal cartilages
What is the insertion of pectoralis minor?
Medial border and superior surface of coracoid process of scapula
What innervates pectoralis minor?
Medial pectoral nerve (C8, T1)
What is the action of pectoralis minor?
Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall
What is the origin of subclavius?
Junction of 1st rib & its costal cartilage
What is the insertion of subclavius?
Inferior surface of middle third of clavicle
What innervates subclavius?
subclavian nerve (C5, C6)
What is the action of subclavius?
Anchors and depresses clavicle
What is the origin of serratus anterior?
External surfaces of lateral parts of 1st-8th ribs
What is the insertion of serratus anterior?
Anterior surface of medial border of scapula
What innervates serratus anterior?
long thoracic nerve (C5, C6, C7)
