MEDOBLENNORRHEA 



736 



MEGACEPHALIC 



Medoblennorrhea (me-do-blen-or-e 1 '-ah). Synonym of 

 Gonorrhea and Gleet. 



Medorrhea {me-dor-e'-ah) \jifj6ea, genitals; poia, a 

 flow]. A discharge from the reproductive organs. 

 M. urethralis, gonorrhea. M. virilis, gonorrhea of 

 the male urethra. 



Medorrhoic {me-dor-o' '-ik) [fxydea, genitals ; 'poia, flow]. 

 Pertaining to medorrhea. 



Medulla {me-dul'-ah) [L., marrow]. A fatty sub- 

 stance or marrow occupying certain cavities. Also 

 the central parts of certain organs, as distinguished 

 from the cortex. See A Iba. M. of Bone, bone-mar- 

 row. M. dorsalis. See M. spinalis. M. of Hair, 

 the central portion or core of the hair. M. of Nerve- 

 fiber, the myelin or white substance of Schwann. M. 

 oblongata, the upper enlarged part of the spinal cord, 

 extending from the cord opposite the foramen mag- 

 num to the pons Varolii. M., Renal, the substance 

 of the renal pyramids. M. spinalis, M. vertebralis, 

 the spinal cord or marrow ; the myelon. 



Dorsal Aspect of Medulla Oblongata. 

 I. Gray matter surrounding central canal. 2. Orifice of this 

 canal. 3. Median fissure. 4. Its upper extremity. 5. Gray- 

 ish-white matter giving origin to hypoglossal nerve. 6. Emi- 

 nentia teres. 7. Prominence corresponding to nucleus ol 

 6th nerve. 7'. Nucleus of 3d nerve. 8. Gray column giving 

 origin to mixed nerves. 10. Third ventricle and posterior 

 commissure. 



Medullar {me-dul'-ar). Synonym of Medullary. 



Medullary {med' -ul-a-re , or med-ul' '-a-re) [medulla, 

 marrow] . Pertaining to the medulla or to marrow ; 

 resembling marrow. Also, pertaining to the white sub- 

 stance of the brain contained within the cortical 

 envelop of gray matter. M. Canal, the hollow in- 

 terior of long bones, in which the marrow lies. M. 

 Carcinoma, a soft carcinoma very rich in cells; en- 

 cephaloid carcinoma. M. Groove, a longitudinal 

 groove at the anterior part of the embryonal shield of 

 the blastoderm. M. Membrane, the areolar envelop 

 of the marrow of the long bones. M. Plates. 

 See Plate. M. Rays. I. Also called Pyramids of 



Ferrein ; series or bundles of parallel tubules ex- 

 tending from the medulla of the kidney into the 

 cortex. 2. Rays of fundamental tissue that con- 

 nect the pith with the cortex, and separate the fibro- 

 vascular bundles, in the stems of dicotyledons and 

 gymnosperms. M. Sarcoma, a soft, round-celled 

 sarcoma. M. Sheath, 1. the semi-fluid, fatty, white 

 matter between the enveloping sheath and the central 

 axis-cylinder, or essential part of a nerve. 2. A 

 sheath composed of spiral ducts and wood-cells sur- 

 rounding the pith, in dicotyledons and gymnosperms. 

 M. Tube, the closing of the medullary groove, form- 

 ing a closed medullary or neural tube. M. Velum. 

 See Velum. 



Medullated {med' '-ul-a-ted) \_medulla, marrow]. Con- 

 taining or covered by medulla or marrow. M. 

 Nerve-fibers, nerve-fibers provided with a medullary 

 sheath, the myelin or white substance of Schwann. 

 Non-M. Nerve-fibers, nerve-fibers not possessing a 

 medullary sheath. 



Medullic Acid [med-ul' '-ik) [medulla, marrow], C. n - 

 H 42 2 . A monobasic acid derived from beef-fat. 



Medullification {med-ul-if-ik-a' -shun) [medulla, mar- 

 row ; facere, to make]. The formation of medulla. 



Medullin (med-ul' -in)[medulla, marrow]. I. A variety 

 of cellulose obtained from the pith or medulla of cer- 

 tain plants. 2. An extract derived from the spinal cord. 



Medulli-spinal {tned-ul-c-spi' -nal) [medulla, marrow . 

 spinalis, spinal]. Relating to the myelon or spinal 

 marrow ; myelonic. 



Medullitis {med-ul-i' '-tis) [medulla, marrow; iru;, in- 

 flammation]. I. Inflammation of marrow. 2. Myelitis. 



Medullization {med-ul-iz-a' -shun) [medulla, marrow]. 

 Softening of bone-tissue in the course of osteitis. 



Medullo-arthritis (med-ul-o-ar-thri' '-tis) [medulla, 

 marrow; apOpov, joint ; itlc, inflammation]. Inflam- 

 mation of the marrow-elements of the cancellated 

 articular portion of a bone. 



Medullo-cell {med-ul' -o-set) [medulla, marrow ; cellule, 

 cell]. A marrow-cell. 



Medullo-ence-phalic (med-ul'-o-en-se/-al'-ilc) [medulla, 

 marrow; ey/ce^«Aoc, brain]. Pertaining to the med- 

 ulla and the encephalon ; myelo-encephalic. 



Medusa {me-du'-sah) [Mefiovoa, one of the Gorgons]. 

 Jelly-fish. M.'sHead. See Medusa Caput. Med- 

 usae Caput, an extensive dilatation of the superficial 

 veins of the abdomen about the umbilicus, seen in 

 certain cases of portal obstruction. The condition 

 largely depends upon the establishment of the venous 

 collateral circulation through an anastomosis of the 

 mesenteric veins and those of the abdominal walls, 

 and, occasionally, also upon a patulousness of fh< 

 bilical vein. 



Meerschaum {mer'-shawm) [Ger. , "sea-foam"]. 

 Mg. 2 H 4 Si 3 9 . A native hydrated magnesium sili 

 locally used in the same way as bole, or cimoliaii 

 earth; it is a good absorbent application. 



Mega-, Megalo- {meg' -ah-, meg'-al-o-) [iiiyag: gen. 

 peydAov']. A prefix signifying large ; also, indicating 

 a unit one million times as great as the unit to which 

 it is prefixed. 



Megabacteria {meg' -ah-bak-te' -re-ah) [/dyac, large : 

 (iaKTT/ptov, bacterium]. Large bacteria; a group 

 the coccobacteria. 



Megacephalia {meg-ah-sef-a'- le- ah) [u~ 

 Ketya'Xi/, head]. The megacephalic condition. 



Megacephalic {meg-ah-sef-al'-ik), Megacephalous 

 {meg-as-ef'-al-us) [utyaq, large; Ke<jm>>,, head], 

 term applied to a skull whose capacity (me 

 by filling with shot through the foramen ma- 

 exceeds 1450 c.c. If less than 1350 it is called micro- 

 cephalic; if between these numbers, mesocephahc. 



