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Lecture 6.7: Skeletal System

This lecture explores the anatomy and function of the pectoral and pelvic girdles within the skeletal system. The pectoral girdle, consisting of the clavicle and scapula, serves as a base for arm movement, highlighting its fragility and common fracture points. It includes details on the humerus, radius, and ulna in the upper and forearm, and discusses wrist structure with 27 bones including carpals, metacarpals, and phalanges. The pelvic girdle, more robust and securely attached than the pectoral girdle, will also be described, focusing on its composition, including the coxal bone.

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Lecture 6.7: Skeletal System

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  1. Lecture 6.7: Skeletal System

  2. Pectoral Girdle • Base for arm movement • Clavicle • Connects to sternum and scapula • Small and fragile • Fractures here are common

  3. Figure 6.21

  4. Pectoral Girdle cont… • Scapula • Shoulderblades

  5. Figure 6.22

  6. Humerus • Upper Arm

  7. Figure 6.23

  8. Radius and Ulna • Forearm • Radius—thumbside • Ulna—pinky side • Radius can roll over ulna • Results in pronation • Radius and ulna straight = supination

  9. Figure 6.24

  10. 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

  11. Figure 6.25

  12. Pelvic Girdle • More massive than the pectoral girdle • More firmly attached

  13. Figure 6.26

  14. Coxal Bone • Hip Bone • Ilium—broad, flared surface • Ischium—forms circle • Pubic symphysis—space between two Ischiums

  15. Figure 6.26b

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