Body of hyoid bone
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|Body of hyoid bone|
Hyoid bone. Anterior surface. Enlarged.
|Latin||Corpus ossis hyoidei|
|Anatomical terms of bone|
The body of hyoid bone or central part of hyoid bone is of a quadrilateral form.
- Its anterior surface is convex and directed forward and upward.
- It is crossed in its upper half by a well-marked transverse ridge with a slight downward convexity, and in many cases a vertical median ridge divides it into two lateral halves.
- The portion of the vertical ridge above the transverse line is present in a majority of specimens, but the lower portion is evident only in rare cases.
- The anterior surface gives insertion to the geniohyoid muscle in the greater part of its extent both above and below the transverse ridge; a portion of the origin of the hyoglossus notches the lateral margin of the geniohyoid attachment.
- Below the transverse ridge the mylohyoid, sternohyoid, and omohyoid are inserted.
- The posterior surface is smooth, concave, directed backward and downward, and separated from the epiglottis by the hyothyroid membrane and a quantity of loose areolar tissue; a bursa intervenes between it and the hyothyroid membrane.
- The superior border is rounded, and gives attachment to the hyothyroid membrane and some aponeurotic fibers of the genioglossus.
- The inferior border affords insertion medially to the sternohyoid and laterally to the omohyoid and occasionally a portion of the thyrohyoid. It also gives attachment to the Levator glandulae thyreoideae, when this muscle is present.
- In early life the lateral borders are connected to the greater cornua by synchondroses; after middle life usually by bony union.
- Anatomy diagram: 25420.000-1 at Roche Lexicon - illustrated navigator, Elsevier
- lesson11 at The Anatomy Lesson by Wesley Norman (Georgetown University) (larynxskel1)
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