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Which ligament behind the dens prevents anterior displacement of C1 on C2?
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The skeletal system54. Ulna
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54.3 Ulnar Shaft: Borders and Load Transfer
The triangular ulnar shaft narrows distally. Its interosseous border faces the radius and anchors the interosseous membrane, which helps stabilize the paired bones and redistribute load. The posterior border is subcutaneous and readily palpable along much of the forearm. The anterior border separates the anterior and medial surfaces.
Ulnar Shaft: Muscular Attachments
Flexor digitorum profundus arises from much of the anterior and medial ulna, and pronator quadratus arises distally. The posterior surface gives origin to parts of abductor pollicis longus, extensor pollicis longus and extensor indicis. Flexor carpi ulnaris and extensor carpi ulnaris attach along the posterior border through adjacent fascial and aponeurotic attachments.
Next: 54.4 Distal end of the Ulna
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Study NotesThe hand - study notes
Carpal bones
- Scaphoid: A boat-shaped bone on the thumb side; it is the most frequently fractured carpal bone.
- Lunate: A crescent moon-shaped bone sitting in the center.
- Triquetrum: A pyramidal bone on the pinky side of the wrist.
- Pisiform: A small, pea-shaped bone that rests on top of the triquetrum.
- Trapezium: A four-sided, saddle-shaped bone that forms the base of the thumb.
- Trapezoid: A smaller, wedge-shaped bone next to the trapezium.
- Capitate: The largest carpal bone, located right in the center.
- Hamate: A wedge-shaped bone on the pinky side characterized by a distinct bony hook.
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