Download The Embryology of the Common Marmoset: Callithrix jacchus by I.R. Phillips PDF

By I.R. Phillips

The primates characterize a various workforce with the phylogenetic relationships of the var ious species mirrored of their early embryonic improvement. The contributors of the Tupaiidae, Lemuridae and Lorisidae convey nice similarities to the reduce mammals or even birds. The Tarsiidae characterize an intermediate step and the Platyrrhini and Catarrhini show the best similarities to guy. through the interval of embryogenesis, the size of an embryo are inadequate advisor to its age and lots more and plenty extra trustworthy info should be derived from a learn of its exterior shape and inner constitution. exam of embryological specimens from quite a few simian species dates again to the early 1900's yet a lot of this fabric used to be accrued in a haphazard means from animals shot within the wild. Heuser and Streeter (1941) depicted a chain of embryos of the rhesus monkey (Macaca mulatta) and correlated their gestational age with exterior shape and measurement. Streeter (1951) prepared human em bryos, among 24. 1 and forty seven. 1 days of post-ovulation age, into age teams or devel opmental horizons in accordance with their exterior shape and inner constitution. every one horizon was once days aside and numbered XI to XXIII. The transition from embryo to fetus happened on the finish of horizon XXIII and was once arbitrarily dermed because the element the place bone marrow invaded the cartilaginous precursor within the humerus. the sooner levels I-X were dermed as a result, (Heuser and nook, 1957; O'Rahilly, 1973).

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