A Case of Bundles of Extra Muscle Observed Bilaterally in Sternothyroids

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  • 両側にみられた胸骨甲状筋の過剰筋束の 1 例
  • リョウガワ ニ ミラレタ キョウコツ コウジョウキン ノ カジョウキン ソク ノ 1レイ

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During the dissection practice for students in 1972, the following variation muscles in bilateral Sternothyroids were encountered. No.249 : Age 61, male. 1. The bundle of extra muscle arisen from right Sternothyroid as a part of its muscle fibers ran in-and-upward along the lateral edge of right thyroid gland. Separated into two heads on the way, the medial head was inserted into loose connective tissue of carotid sheath which was anterior face of common carotid artery, the lateral head was inserted into loose connective tissue between internal and external carotid artery. 2. The bundle of extra muscle arisen from left Sternothyroid as a part of its muscle fibers ran upward along the lateral edge of left thyroid gland and was inserted into loose connective tissue of carotid sheath which was front part of common carotid artery.

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