| 单词 | invagination |
| 例句 | The archenteron develops into the alimentary canal, and a mouth opening is formed by invagination of ectoderm at the pole opposite the blastopore of the gastrula. Fundamentals of Biology 2015-01-01T00:00:00Z White arrow denotes the invagination that forms the shell gland. The oyster genome reveals stress adaptation and complexity of shell formation 2012-10-03T18:22:26.103Z In some cases the inner layer is formed not by invagination but by proliferation or by delamination. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z The pore or opening leading into the cavity of invagination, or archenteron. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z In Myxine a further remarkable peculiarity in regard to the hypophysis, probably adaptive in nature, occurs, inasmuch as the pituitary invagination develops an opening at its posterior end into the pharynx. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z In the majority of the Decapoda there is a saccular invagination of the integument in the basal segment of the antennular peduncle having on its inner surface “auditory” setae of the type just described. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z White arrow denotes the invagination that forms the shell gland. The oyster genome reveals stress adaptation and complexity of shell formation 2012-10-03T18:22:26.103Z This bilobed sac becomes entirely the liver in the adult; the intestine and stomach are formed from the pedicle of invagination, whilst the pharynx, oesophagus and crop form from the stomodaeal invagination ph. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z Further cell-divisions occur, and the invagination becomes deeper, until the invaginating wall nearly touches the wall which has retained its primitive position. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z This mode of making a case or sheath by inversion of a bag is technically called invagination, and is readily seen in new and transparent cells. Marvels of Pond-life A Year's Microscopic Recreations 2011-08-01T02:00:12.067Z The lens of the lateral eye of the vertebrates is derived by an invagination of the ectoderm, which meets and fits in the retinal cup at the end of the optic vesicle. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z Finally, in certain Echinodermata the ventral part of the central nervous system arises by the invagination of a linear streak of ectoderm, the cavity of the invagination persisting as the epineural canal. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z This process must be regarded as equivalent to the first stage of invagination, the yolk being surrounded by hypoblast cells or their nuclei. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Local conditions of growth cause the invagination of a set of the cells of the blastosphere-wall. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z In the Coelentera the ectoderm and endoderm are set apart from one another at a very early period in the life-history; generally either by delamination or invagination, processes described in the article Embryology. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" Segmentation is total and at first regular, and is followed by invagination, the blastopore passing to the position of the future mouth. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" There are two main methods in which the first two are differentiated—invagination and delamination. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z C, The primitive invagination to form one of the otocysts, as seen in fig. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" These two particular symptoms serve to distinguish this affection from enteritis and invagination of the bowel. Special Report on Diseases of Cattle This action will stand for the process of invagination. Essays: Scientific, Political, & Speculative, Vol. I An ectodemic invagination forms a large mucous gland on the foot, which is more or less atrophied in adult life. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" Attempts to plug the canal have, in most cases, been made by invagination of the skin of the scrotum and its fascia. A Manual of the Operations of Surgery For the Use of Senior Students, House Surgeons, and Junior Practitioners It results from this arrangement that the cells forming all but the bottom of the invagination lie horizontally, i.e. at right angles to the vertical axis of the eye. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Intussusception, or invagination.—This is the slipping of a portion of the intestine into another portion immediately adjoining, like a partially turned glove finger. Special Report on Diseases of the Horse Stomatodaeum: that invagination of the ectoderm that forms the mouth, pharynx, oesophagus, crop and gizzard. Explanation of Terms Used in Entomology No sign of a cloacal invagination could be made out with certainty. Development of the Digestive Canal of the American Alligator Figures 10, 11, 12 illustrate the formation of the atrium as a median ventral invagination, at. Text Book of Biology, Part 1: Vertebrata Its anterior portion or pharynx, which arises from the stomodaeal invagination in the embryo, is short; a pair of large, so-called salivary glands open into it. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" The gastrula, finally, is the two-layered sac formed from the blastula, typically by invagination of its wall. Form and Function A Contribution to the History of Animal Morphology Endomesoderm: the inner layer formed by an invagination of the middle portion of the primitive band of the embryo, and from which the endoderm and mesoderm are subsequently differentiated. Explanation of Terms Used in Entomology The entire yolk-mass of the egg divides into cells, and these cells form a hollow, sphere-like body, in which an intestinal canal arises by the invagination of one side. Scientific American Supplement, No. 433, April 19, 1884 There is no open invagination of an archenteron in the fowl, as in the frog--, the gastrula, like the blastosphere, stage is also masked. Text Book of Biology, Part 1: Vertebrata Hence before and during invagination there is an increasing differentiation of the inner from the outer layer. The Evolution of Man — Volume 2 But in the monotremes the formation of the cenogenetic entoderm does not precede the invagination; hence in this case the construction of the germinal layers is less modified than in the other amniota. The Evolution of Man — Volume 1 Foregut: extends from the mouth to the end of gizzard; its epithelium being formed from the ectodermal invagination known as the stomodaeum. Explanation of Terms Used in Entomology When the blastula is fully formed, we have again in this case the important folding or invagination that determines gastrulation. The Evolution of Man — Volume 1 We naturally assume, from what we have learnt, that the next stages will be the formation of a hollow blastosphere, invagination, a gastrula forming mesoblast by hollow outgrowths from the archenteron, and so on. Text Book of Biology, Part 1: Vertebrata Nevertheless, the gastrula is formed here, as in the previous cases, by the folding or invagination of the blastula. The Evolution of Man — Volume 1 Also, in every case, the gastrula develops from the blastula by curving or invagination. The Evolution of Man — Volume 1 The gastrula is then formed by invagination, or a kind of turning-up of the edge of the blastoderm. The Evolution of Man — Volume 1 In these the gastrulation proceeds in two phases, as Semon rightly observes: firstly, formation of the entoderm by cleavage at the centre and further growth at the edge; secondly, invagination. The Evolution of Man — Volume 1 The difference is evidently entirely due to the presence of yolk, and the consequent modification of invagination in the former case. Text Book of Biology, Part 1: Vertebrata But in the third sub-class of the mammals the serolemma forms, by invagination at its outer surface, a number of hollow tufts or villi, from which it takes the name of the chorion or mallochorion. The Evolution of Man — Volume 1 Thus the gastrulation of the placentals, which diverges most from that of the amphioxus, the primitive form, is reduced to the original type, the invagination of a modified blastula. The Evolution of Man — Volume 1 |
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