Last edited by Tuhn
Sunday, May 10, 2020 | History

5 edition of On the origin of the so-called test-cells in the Ascidian ovum found in the catalog.

On the origin of the so-called test-cells in the Ascidian ovum

by J. Playfair McMurrich

  • 258 Want to read
  • 25 Currently reading

Published by s.n. in [Boston? .
Written in English

    Subjects:
  • Ovum.,
  • Embryology.,
  • Oeuf.,
  • Embryologie.

  • Edition Notes

    Statementby J. Playfair McMurrich
    SeriesCIHM/ICMH Microfiche series = CIHM/ICMH collection de microfiches -- no. 27179, CIHM/ICMH microfiche series -- no. 27179
    The Physical Object
    FormatMicroform
    Pagination1 microfiche (9 fr.)
    ID Numbers
    Open LibraryOL24135216M
    ISBN 100665271794

      The precise mode of origin of the pseudhsemal system, or so-called blood-vessels, of the Echinoderms is not yet made out. But it is known that the cavity of these vessel* contains corpuscles similar to those which are found in. the perivisceral cavity and in the ambulacral vessels, and that all three communicate.   Oysters also have a so-called ovum, corresponding in character to that of the sea-urchins, but existing only on one side of their body. Now inasmuch as the sea-urchin is of a spherical form, and not merely a single disk like the oyster, and in virtue of its spherical shape is the same from whatever side it be examined, its ovum must necessarily.

    The book is the result of extensive but desultory reading, advocated by our well-meaning author, are simply absurdities. The boolk is well written, with excellent illustrations, and type On. the orig-in of the so-called " test cells " in. the ascidian. ovuLm, by J. McMarrich ; Sone notes on. the development of Arbricia pzimctzatla, by H. PREFATORY NOTE. This book of mine has little need of preface, for indeed it is “all preface” from beginning to end. I have written it as an easy introduction to the study of organic Form, by methods which are the common-places of physical science, which are by no means novel in their application to natural history, but which nevertheless naturalists are little accustomed to employ.

    diploid cells contain two sets of chromosomes and somatic cells are diploid. Reproduction that involves alternating meiosis and fertilization is called. sexual reproduction. Reduction division is a unique feature of meiosis. In the angle made by the outgoing intestine with the stomach, a blind diverticulum arises. It is at first a sim- ple coecum, but soon begins to branch (Fig. C), and finally forms an arborescent growth embracing the in- testine (Fig. ). This is the so-called pyloric gland, and it is probably homologous with the hepatic cceciim of Amphioxus.


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On the origin of the so-called test-cells in the Ascidian ovum by J. Playfair McMurrich Download PDF EPUB FB2

Additional Physical Format: Print version: McMurrich, J. Playfair (James Playfair), On the origin of the so-called "test-cells" in the Ascidian ovum. Details - On the origin of the so-called "test-cells" in the Ascidian ovum - Biodiversity Heritage Library The Biodiversity Heritage Library works collaboratively to make biodiversity literature openly available to the world as part of a global biodiversity community.

BHL works best with JavaScript enabled. On the origin of the so-called "test-cells" in the Ascidian ovum. By J. Playfair (James Playfair) McMurrich. Cite. BibTex; Full citation; Topics: Embryology, Ovum Author: J. Playfair McMurrich. On the origin of the so-called "test-cells" in the Ascidian ovum By J.

Playfair (James Playfair) McMurrich Topics: Embryology, Ovum. On the origin of the so-called "test-cells" in the Ascidian ovum [microform] / by J. Playfair McMurrich The inventions of Leonardo da Vinci Leonardo da Vinci, Many studies have dealt with the origin and differentiation of oocytes and their envelopes in ascidians and, in particular, with the origin and roles of test cells and the vitelline coat.

Test cells differentiate in close association with oocytes and, although several functions have been attributed to them during oogenesis, none has ever. Blood Cell Ultrastructure of the Ascidian Botryllus schlosseri. Article in Acta Zoologica 59(3‐4) - April with 11 Reads How we measure 'reads'.

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Search the history of over billion web pages on the Internet.

search Search the Wayback Machine. Featured texts All Books All Texts latest This Just In Smithsonian Libraries FEDLINK (US) Genealogy Lincoln Collection.

National Emergency Full text of "The physiology of. Full text of "The pineal organ; the comparative anatomy of median and lateral eyes, with special reference to the origin of the pineal body; and a description of the human pineal organ considered from the clinical and surgical standpoints" See other formats.

The Biodiversity Heritage Library works collaboratively to make biodiversity literature openly available to the world as part of a global biodiversity community. Ovum Spermatozoa. On the origin of the so-called "test-cells" in the Ascidian ovum.

View Metadata. By: McMurrich, J. Playfair (James Playfair). An aphid is an insect that has a beak to sip plant sap. When placed on a herbaceous stem, it soon has its mouthparts embedded and is withdrawing plant sap.

Sometimes so much plant sap. having corresponding to it the ovum stage of ontogeny. The line of descent is then traced through the moroea, blastaea and gastrcea, familiar to all readers of Haeckel's writings, and then passes to the Platodaria and Platodinia, two groups of turbellarian worms represented to-day by the so-called Accela and the Rhabdo-ccela.

The ninth stage is. The follicle cells sometimes give origin to a chorion enveloping the ovum, and in some instances grow out into long external villiform processes.

Within the chorion appear in many instances a number of so-called test-cells. The origin and fate of both the follicular and the test-cells are involved in much difficulty (see lit.

cited below). The nervous systems of the pelagic larval forms of sea squirts (Urochordata and Ascidia) are laid out much like those of vertebrates.

Nonneural cells, usually called ependymal cells, outnumber neurons. When the larvae become sessile, the brain is remodeled, becoming an order of magnitude larger. A system of gynaecology; A system of gynaecology it will be clear that the publication of the above essay made an enormous difference in the value attributed to so-called mechanical causes.

gradual increase in bulk of the ovum and its intolerance of a rapid dilating force a contrast aptly illustrated in the history of the induction of. THE BIOLOGY OF THE SEASONS BY J. Biology of the Seasons should differ from a Natural History And that is our aim in this book.

of the Year. hatched from the delicate envelope of the ovum, and begin life to wriggle about in the dissolving jelly. awkward-looking, half-made creatures at They are somewhat first, and when they.

Primary egg membranes are formed by the egg itself, secondary by the follicle cells around the egg, and tertiary by the uterus or oviduct.

All three types of membrane are sometimes found covering one egg, as in one of the cockroaches, Periplaneta. If only one egg covering occurs. Structure of the Skeletal System made up of 80 bones skull, Ribs sternum (breastbone) spine (spinal column or bony vertebrae) made up bones of limbs (arms, legs, feet and hands.) girdle (clavicle, scapula, pelvis (hip)) the vertebrae protect the spinal cord.

the ribs which connect around to attach to the sternum and protects the heart and. [Issued as University Circular No.

18, September, SEPTEMBER, ] JOHNS HOPKINS UNIVERSITY CIIWULARS. TABLE OF CONTENTS. Johns Hopkins University Circulars. The following statement sounds patently false.

"The different cells in your body rarely have genomes with the identical nucleotide sequence." Provide. The origin-and later development of these cells will he discussed after completing our descrip tion of the gonads.

‘ The Ovary. --lt'l_l:~lt§_£§§§_M9f‘ltl'i§_pY§.}f}: as the germinal epithelium graduzilly _ing_r_§eses in thickness it is in someliiristances dividedlby the 4 ' iooigeurdus cords.68)The first axial support for the embryo is called the ________.

68) Answer:notochord Diff: 2 Type: SA MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the ques 69) Relaxin is a hormone produced by the placenta and ovaries.