foramen cecum medullae oblongatae foramen ce·cum me·dul·lae ob·lon·ga·tae (sē'kəm mĭ-dŭl'ē ŏb'lŏng-gā'tē)
n.
A small triangular depression at the lower boundary of the pons that marks the upper limit of the median fissure of the medulla oblongata.