1. 延髓：
1) 延髓(medulla oblongata)为脊髓伸入颅腔的延续部分. 下界平齐枕骨大孔,上界邻接脑桥下缘. 延髓前面的结构与脊髓相近似,有前正中裂、前外侧沟,前正中裂两侧有纵行隆起为锥体(pyramis),是皮质下行的锥体束构成. 在延髓的下半部,锥体束形成若干小束,

2. 延脑,延髓：medulla 髓,髓质 | medulla oblongata 延脑,延髓 | medullary sheath 髓鞘

noun

1. lower or hindmost part of the brain
continuous with spinal cord
(`bulb' is an old term for medulla oblongata)

e.g. the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning

Synonym: medullabulb