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The skeletal system54. Ulna
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54.3 Shaft
The ulnar shaft is triangular and tapers distally. It has three borders and three surfaces.
The interosseous border faces the radius and provides attachment for the interosseous membrane, which links the forearm bones and transmits load. The posterior border is subcutaneous and palpable, and serves as an attachment for fascia and muscles such as flexor carpi ulnaris and extensor carpi ulnaris.
The anterior border is rounded and provides origin for deep flexors, including flexor digitorum profundus, and distally for pronator quadratus. The posterior surface provides attachment for posterior compartment muscles, including abductor pollicis longus, extensor pollicis longus, and extensor indicis distally.
A nutrient foramen is usually present on the anterior surface, transmitting vessels to the medullary cavity.
Next: 54.4 Distal end of the Ulna
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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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