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Primitive in Biological Dictionary

Primitive streak

... The primitive streak is a structure that forms during the ... and mammalian embryonic development. primitive streak primitive streak Surface view of embryo of a rabbit . ...

Neural plate

... is created by a flat thickening opposite to the primitive streak of the ectoderm. Neurulation is a part ... Plate . extends from buccopharyngeal membrane to primitive node ... During neural induction, the embryonic ... Plate . extends from buccopharyngeal membrane to primitive node ... ... License Plate Recognition ...

Blastopore

... over and contributes to the canal joining the primitive gut with the cavity of the neural tube, the primitive nervous system. blastopore synonyms. ... blastopore . ... blastopore . n. opening of the primitive intestinal tract (Embryology) ... blastopore . ...

Vacuoles

... ... Vacuoles are found in the cells of plants, protists, and some primitive animals. ... Vacuoles . The term means "empty space" ... Plant cells ... ... Vacuoles are found in the cells of plants, protists, and some primitive ... Vacuoles are membrane-bound compartments within some eukaryotic ...

Notochord

... It is composed of cells derived from the mesoderm and defines the primitive axis of the embryo. In some vertebrates and chordates, it persists ... main support of the body in the lowest chordates, such as the lancelet; a primitive Chordata ( kör′dädə ) ( zoology ) The highest phylum in the animal ...

Nerve chord

... conducts impulses in all directions from the area stimulated, forming a primitive ... Nerve chord . References ... Get information, facts, and ... Ocean Life explores marine species and ecosystems, current ... Having a primitive nerve chord and gill slits, a group called the hemichordates ... ...

Monotremes

... listings. monotreme ( ) n. A member of the Monotremata, an order of primitive egg-laying mammals restricted to Australia and New Guinea and consisting ... in the free online English dictionary and ... Monotremes are the most primitive type of living mammal. ... Although monotremes possess the ...

Endoderm

... model, the endoderm specification pathway is initiated ... Anterior primitive endoderm may be responsible for patterning the anterior ... We propose that primitive endoderm is responsible for the initial induction of ... from the ...

Archenteron

... The primitive gut that forms during gastrulation in the developing blastula is known ... the animal pole. ... Archenteron /Primitive streak (Primitive pit, primitive knot/Blastopore, ... Aspects of the topic archenteron are discussed ...

Vascular plants

... plants lack these particular tissues, a number of non- vascular plants possess tissues specialized for internal transport of water. c. Most primitive vascular plants are entirely made up of primary tissues ... b. The secondary vascular tissues and periderm make up the secondary plant body ...

Vacuole

... - Definition of Vacuole at Dictionary.com a free online dictionary with ... Vacuoles are found in the cells of plants, protists, and some primitive animals. ... ... contain one or several vacuoles , that may have different functions from each other. Vacuoles have a diverse array ... ...

Tetrapod

... as did limbs ... Devonian Tetrapods ... Detailed account of early tetrapod evolution. ... Abstract of Jennifer Clack's identification of a primitive baphetid tetrapod . ... Academic Kids.com provides an online encyclopedia with thousands of free articles ... Detailed account of early tetrapod ...

Spermatogonia

... repopulate the seminiferous ... Loss of spermatogonia and wide-spread DNA methylation defects in newborn male ... were conducted on postnatal primitive type A spermatogonia lacking DNMT3L. ... Strong mosaicisms towards expansions were already observed in spermatogonia before meiosis. ... ...

Slime molds

... in the Protista. ... Slime molds are composed of an acellular mass of naked protoplasm with no cell ... slime mold n. Any of various primitive organisms of the phylum Acrasiomycota, especially of the genus Dictyostelium, that grow on dung and decaying Slime molds are fungus-like ...

Sinus venosus

... and word games. Fate of the Sinus Venosus (Formation of the Right Atrium) Figure 1 ... Communication between the sinus venosus and the primitive atrium, the sinoatrial ... Britannica online encyclopedia article on sinus venosus (anatomy), ... the true vertebrate. Its circulatory ...

Proglottid

... itself away from the dog's ... Britannica online encyclopedia article on proglottid (zoology), ... presence of two pigment spots, which are primitive eyes. In the case of the tapeworm, the ... Each proglottid contains a complete set of male and female reproductive organs ... occur between two ...

Pineal gland

... and Cancer-An Epigenetic Approach to the Control of Malignancy: ... We believe that the pineal gland and retina both evolved from the same primitive ... Characterization of 14-3-3 proteins in the pineal gland ... ...

Photosystem

... theoretical, simple, dynamic, membrane-based mechanism for free energy ... photosystem 0 (photosynthesis based on dipole formation ... model for primitive photosynthesis mechanism working on light-dark cycling ... Photosystem 0 is a proposed intermediate on the evolutionary path from MTS to ... ...

Origin of life

... of life , in the physical, chemical, and biological sciences, is the ... In his The Origin of Life on Earth, Oparin suggested that the primitive Earth ... Research into the origin of life . Learn how certain small molecule interactions ... Origin of Life . Core Nuclear Pore ...

Nonvascular plants

... amphibians, consequently tend to be ... Nonvascular plants spend the predominance of their life cycle in the haploid or ... The most primitive of the nonvascular plants are considered to be members of the ... The California Native Plant Society (CNPS) is a non-profit organization ......

Nephridium

... types of invertebrates ... Retrieved from "http://en.wikipedia.org /wiki/ Nephridium " ... unit of the excretory system in many primitive invertebrates and also in the amphioxus; it expels wastes from the body cavity to the (usually aquatic) exterior. The evolution of nephridia ...

Myotome

... in somite (germ layer) ) ... arches of the vertebrae; the dermatome, precursor of the connective tissue of the skin; and the myotome , or primitive muscle, from which the major muscles of vertebrates are derived. The term somite ... Myotome = musculature of back, ribs and limbs. ...

Monera

... or other membrane-bounded organelles. Monera - Definition of Monera at Dictionary.com a free online dictionary with ... Monera are the most primitive living things and are thought to have been the ... Monera are bacteria and other mostly tiny, single-celled organisms whose genetic ... While ...

Mesentery

... of the peritoneum that connect the intestines to the dorsal abdominal wall, especially such a fold Ventral mesentery Ventral mesentery The primitive mesentery of a six weeks' human embryo, half schematic ... of the peritoneum to the mesentery ? Read ... Online Medical Dictionary ...

Masseter

... (1965) presented a synopsis of the evolutionary changes in the masseter . ... In hystricomorphs the lateral masseter remains restricted to its primitive ... ...

Insectivores

... dominantly long-distance migrants, ... Insectivora ( in′sek′tivərə ) ( vertebrate zoology ) An order of mammals including ... Most of the primitive eutherian (placental) mammals were insectivores . ... Entrez! ( Français) / Enter! ( English) Carnivorous Plant Web Ring. Previous Site. Next ...

Hereditary Unit

... or inherited through hereditary information ... The ultimate hereditary units may, like the chromosomes themselves, retain a ... in the primitive types of nucleus, the carriers of the same hereditary unit were ... The unit may also be used as a summary or motivational part of an eight ...

Gastrulation

... gastrulation . I ... The main changes associated with gastrulation affect the epiblast. ... When the process of gastrulation is complete the primitive streak disappears. ... 3. Mammals - gastrulation similar to birds and reptiles, even though eggs possess little yolk. ... AMPHIOXUS ...

Endosperm

... point of view because it is ... Embryo and endosperm are derived from individual fertilization events (double ... A study of endosperm in primitive flowering plants, such as the waterlily family, ... This stage of endosperm development is important in determining final seed size ... The ...

Embryo sac

... sac is a membranous sac attached to an embryo , providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals. It functions as the developmental circulatory system of the human embryo , before internal ... Aspects of the topic ...

Dorsal aorta

... Each primitive aorta receives anteriorly a vein—the vitelline vein—from the yolk-sac, and is prolonged backward on the lateral aspect of the notochord under ...

Companion cells

... the following places at Britannica. Assorted References association with sieve tube ( in sieve tube (plant structure); ... cells , showing more primitive structural features, perform the same function. Sieve-tube elements are almost always adjacent to nucleus-containing companion cells , which have ...

Cloaca

... cloaca recordings, atlatl, the twlo, pzlon, phil hendricks, phillip hendricks. ... cloaca recordings po box 17565 seattle, wa 98107 usa ... The primitive hindgut is the anlage of the terminal ileum, colon, and cloaca . The cloaca is divided into anterior and posterior positions, which form the .....

Buffer

... overflow attacks are said to have arisen because the C programming ... A buffer is a linear, finite sequence of elements of a specific primitive type. ... A buffer's mark is the index to which its position will be reset when the reset ... This page describes the term buffer and lists ...

Allantois

... What does allantois mean? ... allantois /al·lan·to·is/ (ah-lan'to-is) a ventral outgrowth of the embryos of ... ... into a role for the primitive streak in development of the murine allantois ... During gastrulation, the allantois grows into the exocoelomic cavity as a ... Bilaminar ...
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