DICT.TW Dictionary Taiwan
medulla
n 1: a white fatty substance that forms a medullary sheath around
the axis cylinder of some nerve fibers [syn: myelin, myeline]
2: lower or hindmost part of the brain; continuous with spinal
cord; (`bulb' is an old term for medulla oblongata); "the
medulla oblongata is the most vital part of the brain
because it contains centers controlling breathing and
heart functioning" [syn: medulla oblongata, bulb]
3: the inner part of an organ or structure in plant or animal
[ant: cortex]
[also: medullae (pl)]