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mental spine
A mental spine is a small projection of bone on the posterior aspect of the mandible (lower jaw bone) in the midline. The adjective ''mental'' in this instance is used in its "chin-related" sense (from Latin ''mentum'') rather than its more common "mind-related" sense (from Latin ''mens''). There are usually four mental spines: two superior and two inferior. Collectively they are also known as the ''genial tubercle'',〔"Genial tubercle." The American Heritage Stedman's Medical Dictionary. Houghton Mifflin Company, 2002. http://www.answers.com/topic/mental-spine Accessed: 22 Oct. 2007.〕 ''genial apophysis'' and the Latin name ''spinae mentalis''. The inferior mental spines are the points of origin of the geniohyoid muscle,〔"Genial tubercle." Mosby's Dental Dictionary. Elsevier, Inc., 2004. http://www.answers.com/topic/mental-spine Accessed: 22 Oct. 2007.〕 one of the suprahyoid muscles and the superior mental spines are the origin of the genioglossus muscle, one of the muscles of the tongue.
== Additional images ==
File:Slide2oooo.JPG|Mental spine
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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