Lunate: Difference between revisions
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== Description == | == Description == | ||
The name of the lunate bone derives from the "crescent-shaped" (Latin: ''lunatus''),<sup>[5]</sup> from Latin ''luna'' ("moon"), from the bone's resemblance to a crescent moon. In amphibians and reptiles, the bone is instead referred to as the '''''intermedium''''', because of its position between the other two proximal carpals. | |||
=== Structure | The lunate bone may be distinguished by its deep concavity and crescentic outline. It is situated in the center of the proximal row of the carpus, between the navicular and triangular. The '''superior surface,''' convex and smooth, articulates with the radius. The '''inferior surface''' is deeply concave, and of greater extent from before backward than transversely: it articulates with the head of the capitate, and, by a long, narrow facet (separated by a ridge from the general surface), with the hamate. The '''dorsal''' and '''volar surfaces''' are rough, for the attachment of ligaments, the former being the broader, and of a somewhat rounded form. The '''lateral surface''' presents a narrow, flattened, semilunar facet for articulation with the navicular. The '''medial surface''' is marked by a smooth, quadrilateral facet, for articulation with the triangular.<ref name=":0">Gray H. ''[https://www.bartleby.com/107/54.html Anatomy of the Human Body].'' Twentieth edition. Philadelphia: Lea & Febiger; 1918 Available from: https://www.bartleby.com/107/54.html [Accessed 19 June 2019] </ref> | ||
The '''lunate bone''' ('''semilunar bone''') is a carpal bone in the human hand. It is distinguished by its deep concavity and crescentic outline. It is situated in the center of the proximal row carpal bones, which lie between the ulnaand radius and the hand. The lunate carpal bone is situated between the lateral scaphoid bone and medial triquetral bone. | |||
he lunate is a crescent-shaped carpal bone found within the hand. The lunate is found within the proximal row of carpal bones. Proximally, it abuts the radius. Laterally, it articulates with the scaphoid, medially with the triquetral, and distally with the capitate. The lunate also articulates on its distal and medial surface with the hamate bone.<sup>[1]:708[2]</sup> | |||
The lunate is stabilised by a medial ligament to the scaphoid and a lateral ligament to the triquetrum. Ligaments between the radius and carpal bone also stabilise the position of the lunate, as does its position in the lunate fossa of the radius.<sup>[2]</sup> | |||
he proximal surface of the lunate bone is smooth and convex, articulating with the radius. The lateral surface is flat and narrow, with a crescentic facet for articulation with the scaphoid. The medial surface possesses a smooth and quadrilateral facet for articulation with the triquetral. The palmar surface is rough, as is the dorsal surface. The dorsal surface is broad and rounded. The distal surface of the bone is deep and concave.<sup>[3]</sup> | |||
<ref>Moore KL, Dalley AF. ''Clinically Oriented Anatomy.'' Fifth edition. Philadelphia: Lippincot Williams & Wilkins; 2006</ref> | |||
== Structure == | |||
== Function == | == Function == | ||
The carpal bones function as a unit to provide a bony superstructure for the hand.<sup>[1]:708</sup> As a proximal carpal bone, the lunate is also involved in movement of the wrist | |||
== Articulations == | |||
The lunate articulates with ''five'' bones: the radius proximally, capitate and hamate distally, navicular laterally, and triangular medially.<ref name=":0" /> | |||
== Muscle attachments == | |||
== Clinical relevance == | == Clinical relevance == | ||
== | == See also == | ||
* [[Lunate Instability]] | |||
* [[Lunotriquetral Ligament Tears]] | |||
* [[Lunotriquetral dissociation]] | |||
= References = | = References = | ||
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[[Category:Anatomy]] [[Category:Bones]] | [[Category:Anatomy]] | ||
[[Category:Bones]] | |||
[[Category:Bones of the Wrist]] | |||
[[Category:Hand and Wrist Anatomy]] | |||
[[Category:Wrist]] | |||
[[Category:Wrist Bones]] | |||
Revision as of 13:59, 19 June 2019
Original Editor
Top Contributors - Kim Jackson, Nikhil Benhur Abburi, Nina Myburg and Wendy Snyders
Description[edit | edit source]
The name of the lunate bone derives from the "crescent-shaped" (Latin: lunatus),[5] from Latin luna ("moon"), from the bone's resemblance to a crescent moon. In amphibians and reptiles, the bone is instead referred to as the intermedium, because of its position between the other two proximal carpals.
The lunate bone may be distinguished by its deep concavity and crescentic outline. It is situated in the center of the proximal row of the carpus, between the navicular and triangular. The superior surface, convex and smooth, articulates with the radius. The inferior surface is deeply concave, and of greater extent from before backward than transversely: it articulates with the head of the capitate, and, by a long, narrow facet (separated by a ridge from the general surface), with the hamate. The dorsal and volar surfaces are rough, for the attachment of ligaments, the former being the broader, and of a somewhat rounded form. The lateral surface presents a narrow, flattened, semilunar facet for articulation with the navicular. The medial surface is marked by a smooth, quadrilateral facet, for articulation with the triangular.[1]
The lunate bone (semilunar bone) is a carpal bone in the human hand. It is distinguished by its deep concavity and crescentic outline. It is situated in the center of the proximal row carpal bones, which lie between the ulnaand radius and the hand. The lunate carpal bone is situated between the lateral scaphoid bone and medial triquetral bone.
he lunate is a crescent-shaped carpal bone found within the hand. The lunate is found within the proximal row of carpal bones. Proximally, it abuts the radius. Laterally, it articulates with the scaphoid, medially with the triquetral, and distally with the capitate. The lunate also articulates on its distal and medial surface with the hamate bone.[1]:708[2]
The lunate is stabilised by a medial ligament to the scaphoid and a lateral ligament to the triquetrum. Ligaments between the radius and carpal bone also stabilise the position of the lunate, as does its position in the lunate fossa of the radius.[2]
he proximal surface of the lunate bone is smooth and convex, articulating with the radius. The lateral surface is flat and narrow, with a crescentic facet for articulation with the scaphoid. The medial surface possesses a smooth and quadrilateral facet for articulation with the triquetral. The palmar surface is rough, as is the dorsal surface. The dorsal surface is broad and rounded. The distal surface of the bone is deep and concave.[3]
Structure[edit | edit source]
Function[edit | edit source]
The carpal bones function as a unit to provide a bony superstructure for the hand.[1]:708 As a proximal carpal bone, the lunate is also involved in movement of the wrist
Articulations[edit | edit source]
The lunate articulates with five bones: the radius proximally, capitate and hamate distally, navicular laterally, and triangular medially.[1]
Muscle attachments[edit | edit source]
Clinical relevance[edit | edit source]
See also[edit | edit source]
References[edit | edit source]
- ↑ 1.0 1.1 Gray H. Anatomy of the Human Body. Twentieth edition. Philadelphia: Lea & Febiger; 1918 Available from: https://www.bartleby.com/107/54.html [Accessed 19 June 2019]
- ↑ Moore KL, Dalley AF. Clinically Oriented Anatomy. Fifth edition. Philadelphia: Lippincot Williams & Wilkins; 2006
