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Digastrici : ウィキペディア英語版
Digastric muscle

The digastric muscle (also digastricus) (named ''digastric'' as it has two 'bellies') is a small muscle located under the jaw. The term "digastric muscle" refers to this specific muscle. However, other muscles that have two separate muscle bellies include the ligament of Treitz, omohyoid, occipitofrontalis.
It lies below the body of the mandible, and extends, in a curved form, from the mastoid process to the symphysis menti. It belongs to the suprahyoid muscles group.
A broad aponeurotic layer is given off from the tendon of the digastricus on either side, to be attached to the body and greater cornu of the hyoid bone; this is termed the suprahyoid aponeurosis.
==Structure==
The digastricus (digastric muscle) consists of two muscular bellies united by an intermediate rounded tendon.
The two bellies of the digastric muscle have different embryological origins, and are supplied by different cranial nerves.
Each person has a right and left digastric muscle. In most anatomical discussions, the singular is used to refer to a muscle, even when each person actually has two of that muscle -- one on the right side, and another on the left. For example, we speak of the deltoid, even tough there is one deltoid in each shoulder. Likewise, we speak of the digastric even though there is a right and left digastric muscle.

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「Digastric muscle」の詳細全文を読む



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