伸しん筋きん

noun

extensor muscle; protractor

Anatomical term for a muscle that extends or straightens a joint. Often contrasted with 屈筋 (flexor).

See also: 屈筋

• 伸しん筋きんと屈くっ筋きんのバランスが大たい切せつです。

  The balance between extensor and flexor muscles is important.

• この運うん動どうは腕うでの伸しん筋きんを鍛きたえます。

  This exercise strengthens the arm's extensor muscles.