Lunar bone ( lat. Os lunatum , lit. "moon bone") - one of the bones of the wrist . It is located in the proximal row, the second on the radial side (between the scaphoid and trihedral bones); the radius bone is located proximal to it, and the bones of the second row of the wrist are distal to it. The bone got its name because of its shape resembling a young month.
| Lunar bone | |
|---|---|
| lat os lunatum | |
 Bones of a human brush. The left picture shows a view from the rear of the brush, on the right - from its palmar surface. The bones of the wrist are highlighted in color and marked with letters. Proximal row : A - scaphoid , B - lunate , C - trihedral , D - pea - shaped . Distal row : E - trapezoidal bone , F - trapezoidal , G - capitate , H - hook - shaped . | |
 Left lunar bone. | |
| Articulations | beam , capitate , hook-shaped , scaphoid |
| Catalogs | |
Content
Anatomy
A bone has several surfaces:
- The upper (proximal) surface is convex and smooth, adjacent to the carpal articular surface of the radius, takes part in the formation of the wrist joint .
- The lower (distal) surface is concave, its anteroposterior size prevails over the transverse; it is adjacent to the head of the capitate bone and the hook bone, taking part in the formation of the mid-carpal joint.
- The back and palmar surfaces of the bone are rough, ligaments are attached to them, strengthening the joints between the bones of the forearm and wrist.
- The lateral surface of the bone is narrow, flattened, articulates with the scaphoid.
- The medial surface of the bone is a smooth four-sided face, articulating with a trihedral bone.
A similar bone in reptiles and amphibians is referred to as an βintermediate boneβ because of its position between two other proximal bones of the wrist.
Clinical Importance
The lunar bone is dislocated more often than other bones of the wrist [1] [2] .
Additional Images
Bones of the left hand, palmar surface.
Bones of the left hand, back surface.
Sources
- Wrist bones in Gray's Anatomy ( Gray's Anatomy textbook in English, link checked January 14, 2010)
- Human Anatomy , ed. M.R. Sapina. In 2 volumes, T. 1. M .: Medicine, 1987.
Notes
- β Sports medicine - dislocations of the wrist bones
- β Dislocation of the lunar bone (Inaccessible link) . Date of treatment March 2, 2010. Archived April 4, 2011.