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medulla, pl. medullae (me-dul´a, me-dul´e) [NA]

Any soft marrow-like structure, especially in the center of a part. See also m. oblongata.substantia medullaris (1); [L. marrow, fr. medius, middle]
m. of adrenal gland suprarenal m
m. glan´dulae suprarena´lis suprarenal m
m. of hair shaft the central axis of some hairs, containing a column of large vacuolated and keratinized cells; the medullary portion is surrounded by the cortex.
m. of kidney renal m
m. of lymph node the central portion of a node consisting of cordlike masses of lymphocytes, plasma cells, and macrophages in a stroma of reticular fibers separated by lymph sinuses; it reaches the surface of the node at the hilum.m. nodi lymphatici;
m. no´di lymphat´ici m. of lymph node
m. oblonga´ta [NA] the most caudal subdivision of the brainstem, immediately continuous with the spinal cord, extending from the lower border of the decussation of the pyramid to the pons; its ventral surface resembles that of the spinal cord except for the bilateral prominence of the inferior olive; the dorsal surface of its upper half forms part of the floor of the fourth ventricle. Motor nuclei of the m. oblongata include the hypoglossal nucleus, the dorsal motor nucleus, inferior salivatory nucleus, and the nucleus ambiguus; sensory nuclei include the nuclei of the posterior column (gracile and cuneate), the cochlear and vestibular nuclei, the mid and caudal portions of the spinal trigeminal nucleus, and the nucleus of the solitary tract. See also medulla.myelencephalon [NA], oblongata;
m. os´sium [NA] bone marrow
m. os´sium fla´va yellow bone marrow
m. os´sium ru´bra red bone marrow
renal m. the inner, darker portion of the kidney parenchyma consisting of the renal pyramids.m. renalis [NA], m. of kidney;
m. rena´lis [NA] renal m
m. spina´lis [NA] spinal cord
suprarenal m. it is composed principally of anastomosing cords of cells in the core of the gland; the cells display a chromaffin reaction because of the presence of epinephrine and norepinephrine in their granules.m. glandulae suprarenalis, m. of adrenal gland;


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