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the brain and spinal cord are developed. -- Medullary rays (Bot.), the rays of cellular tissue seen in a transverse section of exogenous wood, which pass from the pith to the bark. -- Medullary sheath (Anat.), the layer of white semifluid substance (myelin), between the primitive sheath and axis cylinder of a medull…

A thin layer or fold of tissue, usually supported by a fibrous network, serving to cover or line some part or organ, and often secreting or absorbing certain fluids.

Tissue composed of spheroidal cells.

A tissue of growing cells, or cells capable of further division.

The part of the mesoblast which gives rise to the connective tissues and blood.

e membranes, or one of the membranes (consisting of a fold of the peritoneum and inclosed tissues), which connect the intestines and their appendages with the dorsal wall of the abdominal cavity. The mesentery proper is connected with the jejunum and ilium, the other mesenteries being called mesoc, mesocolon, mesorectu…

The middle layer of tissue in some vegetable structures.

Pertaining to, or derived from, the mesoderm; as, mesodermal tissues.

A thin gelatinous tissue separating the ectoderm and endoderm in certain coelenterates. -- Mes`o*gloeal, a.

The act or process, by which living tissues or cells take up and convert into their own proper substance the nutritive material brought to them by the blood, or by which they transform their cell protoplasm into simpler substances, which are fitted either for excretion or for some special purpose, as in the manufacture…

The act or process by which matter is taken up by cells or tissues and is transformed into other matter; in plants, the act or process by which are produced all of those chemical changes in the constituents of the plant which are not accompanied by a production of organic matter; metabolism.

ituting the egg, is converted into a multitude of cells, which are metamorphosed into the tissues of the body. A central cavity is commonly developed, and the cells around it are at first arranged in two layers, -- the ectoderm and endoderm. The group comprises nearly all animals except the Protozoa.…

te appearance occasioned by an accumulation of serum and sometimes of pus in the cellular tissue. -- Milk meats, food made from milk, as butter and cheese. [Obs.] Bailey. -- Milk mirror. Same as Escutcheon, 2. -- Milk molar (Anat.), one of the deciduous molar teeth which are shed and replaced by the premolars. -- M…

A machine used for expelling the juice, sap, etc., from vegetable tissues by pressure, or by pressure in combination with a grinding, or cutting process; as, a cider mill; a cane mill.

g an integral part of, a living unit or of the morphological framework; as, morphotic, or tissue, proteids. Foster.

found in all the secretions from mucous glands, and also between the fibers of connective tissue, as in tendons. See Illust. of Demilune.

Resembling mucus. Dunglison. Mucoid degeneration, a form of degeneration in which the tissues are transformed into a semisolid substance resembling mucus. Quain.

found in the mucous membranes of the mouth and anus, usually due to syphilis. -- Mucous tissue (Anat.), a form of connective tissue in an early stage of development, found in the umbilical cord and in the embryo, and also in certain tumors called myxomata.

but disappear in the male. -- Müllerian fibers (Anat.), the sustentacular or connective-tissue fibers which form the framework of the retina.

ricks or stones in squareness and regular arrangement; as, a muriform variety of cellular tissue.