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| external carotid artery ： ウィキペディア英語版 |
external carotid artery
The external carotid artery is a major artery of the head and neck. It arises from the common carotid artery when it splits into the external and internal carotid artery. It supplies blood to the face and neck. 〔(【引用サイトリンク】url=http://www.webmd.com/heart/picture-of-the-carotid-artery )〕
==Structure==
The external carotid artery begins at the upper border of thyroid cartilage, and curves, passing forward and upward, and then inclining backward to the space behind the neck of the mandible, where it divides into the superficial temporal and maxillary artery within the parotid gland.
It rapidly diminishes in size as it travels up the neck, owing to the number and large size of its branches.
At its origin, this artery is closer to the skin and more medial than the internal carotid, and is situated within the carotid triangle.
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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