Chapter 5 The Skeletal System

The Appendicular Skeleton Limbs (appendages) Pectoral girdle Pelvic girdle 126 Bones

The Appendicular Skeleton

The Pectoral (Shoulder) Girdle Composed of two bones Clavicle – collarbone Scapula – shoulder blade These bones allow the upper limb to have exceptionally free movement

Bones of the Shoulder Girdle

Bones of the Shoulder Girdle

Scapula (shoulder blade) Glenoid cavity- creates a place for the head of the humerus to fit (socket) 3 borders- Superior, vertebral (medial), axillary (lateral) Spine is a large ridge on posterior side, provides for large area of muscle attachment Acromion process- acromioclavicular joint (A-C joint) Corocoid process- helps in stabilizing the A-C joint

Bones of the Upper Limb The arm is formed by a single bone Humerus

Humerus Greater tubercle Lesser tubercle Head of humerus Olecranon fossa Epicondyles Condyles

Bones of the Upper Limb The forearm has two bones Ulna Radius

Ulna Olecranon process: funny bone; point of elbow Styloid process: site of muscle attachment

Radius Radial tuberosity: site of attachment for the bicep Ulnar notch: point of articulation with the Ulna Styloid process

Bones of the Upper Limb The hand Carpals (8) – wrist Metacarpals (5) – palm Phalanges (14) – fingers