segment primordial

См. также в других словарях:

• segment — 1. A section; a part of an organ or other structure delimited naturally, artificially, or by invagination from the remainder. SYN: segmentum [TA]. SEE ALSO: metamere. 2. A territory of an organ having independent function, supply, or drainage. 3 …   Medical dictionary

• primitive segment — primordial segment, protovertebral segment somite …   Medical dictionary

• reproductive system, animal — Introduction       any of the organ systems by which animals reproduce.       The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… …   Universalium

• nervous system, human — ▪ anatomy Introduction       system that conducts stimuli from sensory receptors to the brain and spinal cord and that conducts impulses back to other parts of the body. As with other higher vertebrates, the human nervous system has two main… …   Universalium

• DIGESTIF (APPAREIL) — L’appareil digestif est l’un des premiers à se différencier dans l’échelle animale puisqu’il existe déjà, sous forme d’un sac s’ouvrant à l’orifice buccal, chez les Cœlentérés. C’est aussi l’un des appareils dont la différenciation est le plus… …   Encyclopédie Universelle

• Hegel, spirit, and politics — Leo Rauch Hegel’s impact on political thought has been immense giving shape to the major political movements of the modern world. Yet the person of average education is hardly familiar with the name, which is usually identified with a small… …   History of philosophy

• endocrine system, human — ▪ anatomy Introduction  group of ductless glands (gland) that regulate body processes by secreting chemical substances called hormones (hormone). Hormones act on nearby tissues or are carried in the bloodstream to act on specific target organs… …   Universalium

• Insect morphology — Legend of body parts Tagmata : A Head, B Thorax, C Abdomen. 1. antenna 2. ocelli (lower) 3. ocelli (upper) 4. compound eye 5. brain (cerebral ganglia) 6. prothorax …   Wikipedia

• Judaism — /jooh dee iz euhm, day , deuh /, n. 1. the monotheistic religion of the Jews, having its ethical, ceremonial, and legal foundation in the precepts of the Old Testament and in the teachings and commentaries of the rabbis as found chiefly in the… …   Universalium

• Piston (mécanique) — Pour les articles homonymes, voir Piston. Un piston permet la conversion d une pression en un travail ou réciproquement. En mécanique, un piston est une pièce …   Wikipédia en Français

• virus — viruslike, adj. /vuy reuhs/, n., pl. viruses. 1. an ultramicroscopic (20 to 300 nm in diameter), metabolically inert, infectious agent that replicates only within the cells of living hosts, mainly bacteria, plants, and animals: composed of an RNA …   Universalium