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||Medulla oblongata. [L., oblong medulla]
(Anat.), the posterior part of the brain connected with
the spinal cord. It includes all the hindbrain except the cerebellum
and pons, and from it a large part of the cranial nerves arise. It
controls very largely respiration, circulation, swallowing, and other
functions, and is the most vital part of the brain; -- called also
bulb of the spinal cord. See Brain.

Me*dul"lar (?), a. See
Medullary.

Med"ul*la*ry (?), a. [L.
medullaris, fr. medulla marrow: cf. F.
médullaire.] 1. (Anat.)
(a) Pertaining to, consisting of, or resembling,
marrow or medulla. (b) Pertaining to the
medula oblongata.

2. (Bot.) Filled with spongy pith;
pithy.

Medullary groove (Anat.), a groove,
in the epiblast of the vertebrate blastoderm, the edges of which
unite, making a tube (the medullary canal) from which the brain and
spinal cord are developed. -- Medullary rays
(Bot.


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