Capitate bone

Capitate bone
Bone: Capitate bone
Carpus.png
Shown is the right hand, palm down (left) and palm up (right).
Proximal: A=Scaphoid, B=Lunate, C=Triquetral, D=Pisiform
Distal: E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate
Gray227.png
The left capitate bone
Latin os capitatum; os magnum
Gray's subject #54 226
MeSH Capitate+Bone

In the human hand, the capitate bone is the largest of the carpal bones, and occupies the center of the wrist. It presents, above, a rounded portion or head, which is received into the concavity formed by the scaphoid and lunate bones; a constricted portion or neck; and below this, the body. [1] The bone is also found in many other mammals, and is homologous with the "third distal carpal" of reptiles and amphibians.

The etymology derives from the Latin capitātus, "having a head," from capit-, meaning "head."

Contents

Surfaces

The superior surface is round, smooth, and articulates with the lunate bone.

The inferior surface is divided by two ridges into three facets, for articulation with the second, third, and fourth metacarpal bones, that for the third being the largest.

The dorsal surface is broad and rough.

The volar surface is narrow, rounded, and rough, for the attachment of ligaments and a part of the Adductor pollicis muscle.

The lateral surface articulates with the lesser multangular by a small facet at its anterior inferior angle, behind which is a rough depression for the attachment of an interosseous ligament. Above this is a deep, rough groove, forming part of the neck, and serving for the attachment of ligaments; it is bounded superiorly by a smooth, convex surface, for articulation with the navicular.

The medial surface articulates with the hamate by a smooth, concave, oblong facet, which occupies its posterior and superior parts; it is rough in front, for the attachment of an interosseous ligament.

[1]

Articulations

The capitate articulates with seven bones: the scaphoid and lunate proximally, the second metacarpal, third metacarpal, and fourth metacarpal distally, the lesser multangular on the radial side, and the hamate on the ulnar side. [1]

See also

Additional images

Capitate bone.  
Os capitatum of the left hand, palmar surface  
Os capitatum of the left hand, dorsal surface  
Bones of the left hand. Volar surface.  
Bones of the left hand. Dorsal surface.  
Transverse section across the wrist and digits.  

References

  1. ^ a b c Gray's Anatomy (1918). See infobox.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.


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Look at other dictionaries:

  • capitate bone — noun the wrist bone with a rounded head shape that articulates with the 3rd metacarpus • Syn: ↑capitate, ↑os capitatum • Derivationally related forms: ↑capitate (for: ↑capitate) • Hypernyms: ↑ …   Useful english dictionary

  • capitate bone — noun The largest of the bones in the human wrist. Syn: os capitatum, capitate …   Wiktionary

  • capitate bone — Anat. the largest and central bone of the carpus, articulating with the second, third, and fourth metacarpal bones. * * * …   Universalium

  • capitate bone — the largest bone of the wrist (see carpus). It articulates with the scaphoid and lunate bones behind, with the second, third, and fourth metacarpal bones in front, and with the trapezoid and hamate laterally. * * * os capitatum …   Medical dictionary

  • capitate bone — the largest bone of the wrist (see carpus). It articulates with the scaphoid and lunate bones behind, with the second, third, and fourth metacarpal bones in front, and with the trapezoid and hamate laterally …   The new mediacal dictionary

  • capitate — I noun the wrist bone with a rounded head shape that articulates with the 3rd metacarpus • Syn: ↑capitate bone, ↑os capitatum • Hypernyms: ↑carpal bone, ↑carpal, ↑wrist bone II …   Useful english dictionary

  • capitate — I. /ˈkæpəteɪt/ (say kapuhtayt) adjective having a globular head; collected in a head. {Latin capitātus having a head} II. /ˈkæpəteɪt/ (say kapuhtayt) noun Anatomy a small bone in the distal row of the carpus. {New Latin capitātum (adjective), in… …  

  • capitate — 1. adjective a) Having a large and globular tip. b) Forming a dense cluster. 2. noun (anatomy) The capitate bone of the wrist …   Wiktionary

  • capitate — [ kapɪteɪt] adjective Botany & Zoology ending in a distinct compact head. noun (also capitate bone) Anatomy the largest of the carpal bones, situated at the base of the palm of the hand. Origin C17: from L. capitatus, from caput, capit , head …   English new terms dictionary

  • Bone — is the substance that forms the skeleton of the body. It is composed chiefly of calcium phosphate and calcium carbonate. It also serves as a storage area for calcium, playing a large role in calcium balance in the blood. The 206 bones in the body …   Medical dictionary

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