Medulla

Definition of Medulla

Me`dul´la
n.1.Marrow; pith; hence, essence.
2.(Anat.) The marrow of bones; the deep or inner portion of an organ or part; as, the medulla, or medullary substance, of the kidney; specifically, the medula oblongata.
3.(Bot.) A soft tissue, occupying the center of the stem or branch of a plant; pith.
4.See medulla oblongata.
Medulla oblongata
(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.

Related Words

fat, medullary sheath, myelin, myelin sheath, myeline
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