smaller pectoral muscle

1. The deltoid muscle branch of the thoracoacromial artery must be sought at the intersection between the clavicle and the smaller pectoral muscle on the deltoid muscle anterior margin projection.
   胸肩峰动脉三角肌支应在三角肌前缘深面的锁骨下缘与胸小肌上缘之间寻找。

noun

1. a skeletal muscle that draws down the scapula or raises the ribs

   Synonym:    pectoralis minormusculus pectoralis minor