The Appendicular Skeleton Salt Lake City Community College Human Anatomy Laboratory
THE SKELETAL SYSTEM The Appendicular Skeleton 2 pairs of limbs and 2 girdles Pectoral (shoulder) girdle attaches upper limbs Pelvic (hip) girdle secures lower limbs 3-Segmented limbs Upper = arm Arm Forearm Hand Lower = leg Thigh Leg Foot
Pectoral Girdle (Shoulder Girdle) Clavicle – anterior: collar bone Scapula – posterior: shoulder blade
Scapula Glenoid cavity articulates with the humerus Acromium articulates with clavicle Coracoid process projects anteriorly
Upper extremity Arm or Brachium = upper arm Between shoulder and elbow (humerus) Forearm or Antebrachium Radius & ulna Hand includes: Wrist (carpus) Palm (metacarpus) Fingers (phalanges)
Arm Humerus is the only bone Head of humerus fits into glenoid cavity of scapula Distal & medially, trochlea articulates with the ulna Distal & laterally capitulum articulates with the radius Medial & lateral epicondyles
Right humerus, anterior view
Right forearm bones, anterior view
Hip bone (os coxae): 3 separate bones in childhood which fuse Ilium Ischium Pubis
Lower limb Thigh: femur Leg (lower leg) Tibia Fibula Foot
Right femur, anterior view
Right lower leg, anterior view
Right foot, superior (dorsal) view and inferior (plantar) view