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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. ==See also== * Hyoid bone 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Body of hyoid bone」の詳細全文を読む スポンサード リンク
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