Anterior Axio-Appendicular (Extrinsic Shoulder) Muscles Flashcards
Attachments and Main Action/s
Pectoralis Major
Attachments:
Superior/Proximal: Clavicular Head to Anterior and Medial Clavicle & Sternocostal Head to Sternum and Superior 6 Costal Cartilages
Inferior/Distal: Lateral Lip of Intertubercular Sulcus of Humerus
Action:
Adducts and Medially Rotates Humerus & Draws Scapula Superiorly and Inferiorly Acting Alone & Clavicular Head Flexes Humerus & Sternocostal Head Extends it from a Flexed position
Pectoralis Minor
Attachments:
Superior/Proximal: 3rd-5th Ribs (Near Cartilage)
Inferior/Distal: Coracoid Process of Scapul
Action:
Stabilises it (Draws it Against the Thoracic Wall)
Subclavius
Attachments:
Superior/Proximal: Junction Between 1st Rib and its Costal Cartilage
Inferior/Distal: Inferior Surface of Middle Clavicle
Action:
Anchors and Depresses Clavicle
Serratus Anterior
Attachments:
Superior/Proximal: External and Lateral Surfaces 1st-8th Ribs
Inferior/Distal: Anterior Surface of Medial Border of Scapula
Action:
Protracts and (inferior part) Rotates Scapula Function: Holds Scapula against the Thoracic Wall, anchoring it for other muscles to act
