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What is "bulb of the spinal cord"

The Collaborative International Dictionary
bulb of the spinal cord

Medulla \Me*dul"la\, n. [L.]

  1. Marrow; pith; hence, essence. [Obs.]
    --Milton.

  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. [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.