| 单词 | blastoderm |
| 例句 | Germinal Layers and Food-Canal.—The embryo begins to develop as an elongate, thickened, ventral region of the blastoderm which is known as the ventral plate or germ band. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Other writers hold that there is originally one primitive trace, and that composite terata are the product of a more or less extensive cleavage of this single blastoderm. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The rudimentary thorax presents traces of a division into three segments; and the dorso-lateral margins of the cephalic blastoderm, behind the procephalic lobes, have a sinuous margin. On the Origin and Metamorphoses of Insects 2011-12-05T03:00:46.667Z "Sure," said the blastoderm, and they went apart, each to his dunnage kit. The City of Numbered Days 2011-08-31T02:01:25.807Z The embryo of a moth, a dragon-fly or a bug is invaginated into the yolk at the head end, the portion of the blastoderm necessarily pushed in with it forming the amnion. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z Pander observed the germinal membrane or blastoderm, as he for the first time called it, of the fowl’s egg to acquire three layers of organized substance in the earlier period of incubation. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z This is the result of the large quantity of the yolk, and the position the latter assumes in relation to the blastoderm. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" The origin and development of the blastoderm or germinal disc has nothing to do with recapitulation of the phylogeny. Naturalism And Religion Ventral plate: a thickening of the blastoderm of an egg from which the embryo, but not the amnion or serosa is formed. Explanation of Terms Used in Entomology In some parasitic Hymenoptera there is only a single embryonic membrane formed by delamination from the blastoderm, while in a few insects, including the wingless spring-tails, the embryonic membranes are vestigial or entirely wanting. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z In this manner nucleated masses of protoplasm are continually being added to the periphery of the blastoderm and assisting in its growth. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Embryonic tissue from the blastoderm of a chick. Text Book of Biology, Part 1: Vertebrata Schwann's next step is a detailed demonstration of the origin of each tissue from simple cells such as those composing the incubated blastoderm. Form and Function A Contribution to the History of Animal Morphology Ectoderm: the outer layer of skin: the outer layer of the blastoderm, giving rise to the nervous system and to epithelial structures of the body surface. Explanation of Terms Used in Entomology "Are you full awake now, ye red-hot blastoderm?" gasped Graham, struggling to free himself when Gallagher gave him leave. Empire Builders In this manner the germinal disc has become converted into the blastoderm, which consists of a small watch-glass-shaped mass of so-called cells resting on, but continuous with, the large yolk-mass. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The section below is a small portion of the blastodermic area. b.d., blastoderm. y., the undivided yolk. s.c., the segmentation between the blastoderm and yolk. Text Book of Biology, Part 1: Vertebrata The relation between the unfertilised egg and the blastoderm which arises from it is not made altogether clear by Schwann. Form and Function A Contribution to the History of Animal Morphology Endoderm: the inner layer of the blastoderm in the embryo, giving origin to the mid-intestine and other visceral organs: see entoderm. Explanation of Terms Used in Entomology Of course if you think it more scientific to say that what we are discussing is not Adam and Eve and Eden, but the phylogeny of the blastoderm— SAVVY. Back to Methuselah It is characteristic of this kind of ovum that there is always a row of nuclei, called the yolk-nuclei, placed in the denser yolk immediately adjacent to the blastoderm. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Elsewhere in the blastoderm they are distinctly separate. Text Book of Biology, Part 1: Vertebrata According to his account the cells of the blastoderm are formed actually in the ovum. Form and Function A Contribution to the History of Animal Morphology We call this layer the blastoderm, and the sphere itself the blastula, or embryonic vesicle. The Evolution of Man — Volume 2 Let the Creator say, if you like, 'I will establish an antipathetic symbiosis between thee and the female, and between thy blastoderm and her blastoderm.' Back to Methuselah But it must be borne in mind that all the nucleated masses of which the blastoderm consists are in continuity with each other and with the sparse protoplasmic reticulum of the subjacent yolk. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z This blastoderm is a simple, completely closed vesicle, the internal cavity of which is entirely full of food-yelk. The Evolution of Man — Volume 1 When the egg leaves the ovary the nucleus disappears, leaving behind it this rudiment of the blastoderm, which rapidly grows and increases in size. Form and Function A Contribution to the History of Animal Morphology This layer is the blastoderm, the simple epithelium from the cells of which all the tissues of the body proceed. The Evolution of Man — Volume 2 The first of these differentiations in time is the formation of the germ-layers, which takes place by a splitting or separation of the blastoderm into a series of superimposed lamellæ. Form and Function A Contribution to the History of Animal Morphology 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 |
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