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In ontogony, differentiation of male and female individuals from embryos having the same rudimentary sexual organs.

Having the embryo or ovule oblique or transverse to the funiculus; amphitropous. Gray.

ed 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…

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

ucid substance, present in cells in process of development, from which, according to some embryologists, the cell nucleous originates.

in those that are strong on both sides. Bacon. Indifferent tissue (Anat.), the primitive, embryonic, undifferentiated tissue, before conversion into connective, muscular, nervous, or other definite tissue.

rimitive characters make their appearance in consequence of a secondary adaptation of the embryo to the peculiar conditions of its environment; -- distinguished from palingenesis. [Written also cænogenesis.]

Having the cotyledons of a dicotyledonous embryo confluent, and forming a large mass compared with the rest of the body. Henslow.

A disease of cattle and swine in which the flesh is filled with the embryos of different varieties of the tapeworm.

The middle one of the three pairs of embryonic renal organs developed in most vertebrates; the Wolffian body.

by a natural process of growth or development; as, the metamorphosis of the yolk into the embryo, of a tadpole into a frog, or of a bud into a blossom. Especially, that form of sexual reproduction in which an embryo undergoes a series of marked changes of external form, as the chrysalis stage, pupa stage, etc., in inse…

The most posterior of the three pairs of embryonic renal organs developed in many vertebrates.

The direct development of an embryo, without metamorphosis, into an organism similar to the parent organism; -- opposed to metagenesis. E. van Beneden.

onnective tissue in an early stage of development, found in the umbilical cord and in the embryo, and also in certain tumors called myxomata.

Of, pertaining to, or discovered by, Johannes Müller. Müllerian ducts (Anat.), a pair of embryonic ducts which give rise to the genital passages in the female, but disappear in the male. -- Müllerian fibers (Anat.), the sustentacular or connective-tissue fibers which form the framework of the retina.…

ned to become a part of the muscular system; -- applied to structural elements in certain embryonic forms.

One of the embryonic muscular segments arising from the protovertebræ; also, one of the protovertebræ themselves.

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.

on real affinities, as shown in the structure of all parts of the organisms, and by their embryology. It should be borne in mind that the natural system of botany is natural only in the constitution of its genera, tribes, orders, etc., and in its grand divisions. Gray. -- Natural theology, or Natural religion, that par…

One of the dimorphic forms of the species of Dicyemata, which produced vermiform embryos; -- opposed to Ant: rhombogene.