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Amniota :: Amniota (n. pl.) That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals..

Embryonate :: Embryonate (a.) Alt. of Embryonate.

Homosystemic :: Homosystemic (a.) Developing, in the case of multicellular organisms, from the same embryonic systems into which the secondary unit (gastrula or plant enbryo) differentiates..

Myotome :: Myotome (n.) One of the embryonic muscular segments arising from the protovertebrae; also, one of the protovertebrae themselves..

Embryonated :: Embryonated (a.) In the state of, or having, an embryonal..

Myoepithelial :: Myoepithelial (a.) Derived from epithelial cells and destined to become a part of the muscular system; -- applied to structural elements in certain embryonic forms.

Homogeny :: Homogeny (n.) The correspondence of common descent; -- a term used to supersede homology by Lankester, who also used homoplasy to denote any superinduced correspondence of position and structure in parts embryonically distinct (other writers using the term homoplasmy). Thus, there is homogeny between the fore limb of a mammal and the wing of a bird; but the right and left ventricles of the heart in both are only in homoplasy with each other, these having arisen independently since the divergence

Phallus :: Phallus (n.) The penis or clitoris, or the embryonic or primitive organ from which either may be derived..

Otocyst :: Otocyst (n.) An auditory cyst or vesicle; one of the simple auditory organs of many invertebrates, containing a fluid and otoliths; also, the embryonic vesicle from which the parts of the internal ear of vertebrates are developed..

Nasofrontal :: Nasofrontal (a.) Of or pertaining to the nose and the front of the head; as, the embryonic nasofrontal process which forms the anterior boundary of the mouth..

Monembryony :: Monembryony (n.) The condition of an ovule having but a single embryo.

Planula :: Planula (n.) In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with gastrula..

Oospere :: Oospere (n.) An analogous mass of protoplasm in the ovule of a flowering plant; an embryonic vesicle.

Brain :: Brain (n.) The whitish mass of soft matter (the center of the nervous system, and the seat of consciousness and volition) which is inclosed in the cartilaginous or bony cranium of vertebrate animals. It is simply the anterior termination of the spinal cord, and is developed from three embryonic vesicles, whose cavities are connected with the central canal of the cord; the cavities of the vesicles become the central cavities, or ventricles, and the walls thicken unequally and become the three seg

Undifferentiated :: Undifferentiated (a.) Not differentiated; specifically (Biol.), homogenous, or nearly so; -- said especially of young or embryonic tissues which have not yet undergone differentiation (see Differentiation, 3), that is, which show no visible separation into their different structural parts..

Basipterygium :: Basipterygium (n.) A bar of cartilage at the base of the embryonic fins of some fishes. It develops into the metapterygium.

Metanephros :: Metanephros (n.) The most posterior of the three pairs of embryonic renal organs developed in many vertebrates.

Development :: Development (n.) The series of changes which animal and vegetable organisms undergo in their passage from the embryonic state to maturity, from a lower to a higher state of organization..

Diphygenic :: Diphygenic (a.) Having two modes of embryonic development.

Embryous :: Embryous (a.) Embryonic; undeveloped.

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