pontomedullary groove

pon·to·med·ul·lar·y groove

SYN medullopontine sulcus [TA].

pon·to·med·ul·lar·y groove

(pon'to-med'ŭ-lar-ē grūv) The transverse groove on the ventral aspect of the brainstem that demarcates the pons from the medulla oblongata; from its bottom the sixth, seventh, and eighth cranial nerves emerge.