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The Upper Limb aka The Arm

The Upper Limb aka The Arm. This is going to take some studying!. Bones of the upper limb (30/per limb). Arm and Forearm Humerus Radius Ulna. Wrist (8) Scaphoid Lunate Triquetral Pisiform Trapezium Trapezoid Capitate Hamate Just call them carpals!. Palm/Hand Metacarpals (5)

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The Upper Limb aka The Arm

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  1. The Upper Limb aka The Arm This is going to take some studying!

  2. Bones of the upper limb (30/per limb) Arm and Forearm • Humerus • Radius • Ulna Wrist (8) • Scaphoid • Lunate • Triquetral • Pisiform • Trapezium • Trapezoid • Capitate • Hamate • Just call them carpals! Palm/Hand • Metacarpals (5) • Phalanges (14) • Proximal • Middle • Distal

  3. Humerus • Largest bone of upper limb • Articulates with radius and ulna distally • Proximally articulates with scapula at shoulder AFV

  4. Posterior view Humerus Points to know • Head – meets glenoid cavity

  5. Posterior view Humerus Points to know • Greater tuberosity • Lateral tuberosity • Muscle attachment!

  6. Posterior view Humerus Points to know • Lesser tuberosity • medial point of muscle attachment

  7. Posterior view Humerus Points to know • Deltoid tuberosity • Roughened site for rotator cuff attachment

  8. Posterior view Humerus Points to know • Trochlea • Articulation for the ulna

  9. Posterior view Humerus Points to know • Capitulum • “ball like” attachment for radius

  10. Posterior view Humerus Points to know • Epicondyles • Ulnar n. runs behind medial epicondyle

  11. Humerus • Coronoid fossa • Anteriorfossa allows for ulna to articulate when flexion happens • Olecranonfossa • Posteriorfossa allows for ulna to articulate when extension happens

  12. Antebrachium or Forearm • Proximally articulate with humerus • Distally articulate with carpal bones • Radius and Ulna • Attach twice at radioulnar joints • Interosseous membrane between the two

  13. UlnaWhat comes after L? Bow! • The Ulna Forms Elbow • Olecranon process back • Coronoid process • Together form the hinge joint with humerus

  14. Ulna info • While a large part of elbow, very little influence on wrist • Separated by fribrocartilaginous disc from wrist • Distally ends in head and styloidprocess • Where else did we see styloid process?

  15. Radiusmajor forearm bone • That at proximal end wide distally • (Opposite ulna) • Very little contribution to elbow • Large influence on wrist! • Meaning: You move the radius, the hand will move!

  16. Radius markings • Head like a nail

  17. Radius markings • Head like a nail • Radial tuberosity – anchors bicep

  18. Radius markings • Styloid process is distall – anchors ligaments to wrist

  19. Radius markings • Head like a nail • Radial tuberosity – anchors bicep • Styloid process is distall – anchors ligaments to wrist

  20. “Getting a Grip” questions • According to the author, what made Richard Owen a genius? • What is the theme of this book? • What pattern does Owen recognize? • What does Darwin claim is responsible for the similarities in animal limbs? • What about the lung fish is not a coincidence at all? • Why is Ichthyostegaa “let down?”

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