| medulla oblongata | The lowest subdivision of the brainstem, immediately adjacent to the spinal cord. Houses important cardiac and respiratory regulatory centres. (27 Sep 1997) |
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| medulla of adrenal gland | 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. Synonym: medulla glandulae suprarenalis, medulla of adrenal gland. (05 Mar 2000) |
| medulla of hair shaft | The central axis of some hairs, containing a column of large vacuolated and keratinised cells; the medullary portion is surrounded by the cortex. (05 Mar 2000) |
| medulla of kidney | The centre portion of the kidney. (27 Sep 1997) |
| medulla of lymph node | The central portion of a node consisting of cordlike masses of lymphocytes, plasma cells, and macrophages in a stroma of reticular fibres separated by lymph sinuses; it reaches the surface of the node at the hilum. Synonym: medulla nodi lymphatici. (05 Mar 2000) |
| medulla ossium | <haematology> The soft, spongy tissue found in the centre of most large bones that produces the cellular components of blood: white cells, red cells and platelets (haemopoiesis). It is also the most radiation sensitive tissue of the body. (12 May 1997) |
| medulla ossium flava | Bone marrow in which the meshes of the reticular network are filled with fat. Synonym: medulla ossium flava. (05 Mar 2000) |
| medulla ossium rubra | Bone marrow in which the meshes contain the developmental stages of erythrocytes, leukocytes, and megakaryocytes. Synonym: medulla ossium rubra. (05 Mar 2000) |
| medulla renalis | The centre portion of the kidney. (27 Sep 1997) |
| medulla spinalis | <anatomy> Elongated, approximately cylindrical part of the central nervous system of vertebrates that lies in the vertebral canal and from which the spinal nerves emerge. (18 Nov 1997) |
| microcystic disease of renal medulla | Presence of small cysts in the renal medulla associated with anaemia, sodium depletion, and chronic renal failure. It is of two types: 1) fatal autosomal recessive or juvenile type (also called familial juvenile nephrophthisis), beginning at about age 10 with an average duration of 6 to 8 years; 2) autosomal dominant or adult type, beginning at about age 30 but with a more fulminant course. Synonym: microcystic disease of renal medulla. (05 Mar 2000) |
| posterior median fissure of the medulla oblongata | The longitudinal groove marking the posterior midline of the medulla oblongata; continuous below with the posterior median sulcus of the spinal cord. Synonym: sulcus medianus posterior medullae oblongatae, posterior median fissure of the medulla oblongata. (05 Mar 2000) |
| posterior median sulcus of medulla oblongata | The longitudinal groove marking the posterior midline of the medulla oblongata; continuous below with the posterior median sulcus of the spinal cord. Synonym: sulcus medianus posterior medullae oblongatae, posterior median fissure of the medulla oblongata. (05 Mar 2000) |
| posterior pyramid of the medulla | gracile fasciculus |
| cystic disease of renal medulla | Presence of small cysts in the renal medulla associated with anaemia, sodium depletion, and chronic renal failure. It is of two types: 1) fatal autosomal recessive or juvenile type (also called familial juvenile nephrophthisis), beginning at about age 10 with an average duration of 6 to 8 years; 2) autosomal dominant or adult type, beginning at about age 30 but with a more fulminant course. Synonym: microcystic disease of renal medulla. (05 Mar 2000) |