medulla oblongata
Concise Oxford English Dictionary © 2008 Oxford University Press:
medulla oblongata /ˌɒblɒŋˈgɑːtə/
▶noun the continuation of the spinal cord within the skull, forming the lowest part of the brainstem.
– origin C17: mod. L., lit. ‘elongated medulla’.
'medulla oblongata' also found in these Oxford entries:

