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Lecture 6.7: Skeletal System. Pectoral Girdle. Base for arm movement Clavicle Connects to sternum and scapula Small and fragile Fractures here are common. Figure 6.21. Pectoral Girdle cont…. Scapula Shoulderblades. Figure 6.22. Humerus. Upper Arm. Figure 6.23. Radius and Ulna.
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Pectoral Girdle • Base for arm movement • Clavicle • Connects to sternum and scapula • Small and fragile • Fractures here are common
Pectoral Girdle cont… • Scapula • Shoulderblades
Humerus • Upper Arm
Radius and Ulna • Forearm • Radius—thumbside • Ulna—pinky side • Radius can roll over ulna • Results in pronation • Radius and ulna straight = supination
Wrist and Hand • 27 Bones • Carpals—8 bones/hand • Wrist • 2 rows • Limited degree of sliding and twisting • Metacarpals—palm of hand • Phalanges—Fingers • Pollex—Thumb
Pelvic Girdle • More massive than the pectoral girdle • More firmly attached
Coxal Bone • Hip Bone • Ilium—broad, flared surface • Ischium—forms circle • Pubic symphysis—space between two Ischiums