短语词组短语medial crus greater alar cartilage 鼻翼大软骨内侧脚medial sulcus of crus cerebri 大脑脚内侧沟medial crus superficial inguinal ring 腹股沟管皮下环内侧脚medial crus external inguinal ring 腹股沟反转韧带 返回 medial crus