(mĕ-dŭl'ă , mĕ-dul'ă, mĕ-dŭl'ē‵, mĕ-dŭl'ī‵)

Plural: medullae

[L. medulla, marrow, pith]

1. In anatomy, the innermost or central portion of an organ in contrast to the cortex.
2. The caudal segment of the hindbrain. SYN: medulla oblongata; bulb (2).
3. The medulla ossium.

   medullary,

   (med'ŭl-er‵ē , mej'ŭ-ler‵ē , mĕ-dŭl'ă-rē )

   adj.
4. Marrow (1).

adrenal m.The central tissue of the adrenal gland . It is filled with pheochromocytes, which are derived from the neural crest and resemble postsynaptic sympathetic ganglion cells. In response to stimulation by presynaptic sympathetic axons, the pheochromocytes secrete epinephrine and norepinephrine into the bloodstream. SYN: suprarenal medulla.

SEE: illus.; adrenal gland .

m. of hair The central axis of a hair.

m. of kidneys Renal pyramid.

m. nephrica Renal pyramid.

m. oblongata Medulla (3).

m. ossium Marrow (1).

m. of ovary The central portion of the ovary, composed of loose connective tissue, blood vessels, lymphatics, and nerves.

m. spinalis The spinal cord.

suprarenal m.Adrenal medulla