auricularis posterior muscle

au·ri·cu·la·ris pos·te·ri·or mus·cle

(aw-rik-yū'lar'is pos-tēr'ē-ŏr mŭs'ĕl)
Facial muscle of external ear; origin, mastoid process; insertion, posterior portion of root of auricle; action, draws back the pinna; nerve supply, facial.
Synonym(s): musculus auricularis posterior, musculus retrahens aurem, posterior auricular muscle.