also: ちょくきん
noun, noun, used as a suffix
rectus muscle; rectus
Anatomical term for a straight muscle, often used in compound muscle names like 腹直筋 (rectus abdominis).
腹直筋は腹部の前面にある筋肉です。
The rectus abdominis is a muscle on the front of the abdomen.
大腿直筋は太ももの前面にある筋肉の一つです。
The rectus femoris is one of the muscles on the front of the thigh.
From 直 (straight) + 筋 (muscle). The reading ちょっきん is a contraction of ちょくきん.