短语词组短語medial crus greater alar cartilage 鼻翼大軟骨內側腳medial sulcus of crus cerebri 大腦腳內側溝medial crus superficial inguinal ring 腹股溝琯皮下環內側腳medial crus external inguinal ring 腹股溝反轉靭帶 返回 medial crus