noun
lower brainstem
Anatomical term referring to the lower portion of the brainstem, including the medulla oblongata and pons.
下位脳幹は呼吸や心拍などの生命維持機能を司る。
The lower brainstem controls vital functions such as breathing and heartbeat.
脳幹 is the general term for the brainstem, while 下位脳幹 specifically refers to its lower part.
Compound of 下位 (lower) and 脳幹 (brainstem). The exact historical derivation is uncertain, but the term follows standard medical kanji usage.