What is "myelencephalon"

Myelencephalon \My`e*len*ceph"a*lon\, n. [NL., from Gr. myelo`s marrow + E. encephalon.] (Anat.)

1. The brain and spinal cord; the cerebro-spinal axis. Sometimes abbreviated to myelencephal.

2. The metencephalon.
   --Huxley.

n. (context neuroanatomy English) The portion of the brain composed of the medulla oblongata.

1. n. the posterior part of the hindbrain in developing vertebrates; forms the medulla oblongata in adults

2. [also: myelencephala (pl)]

The myelencephalon or afterbrain is the most posterior region of the embryonic hindbrain, from which the medulla oblongata develops.