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Early Development of the Shoulder Girdle and Sternum in Marsupials (Mammalia: Metatheria) (Paperback)
Loot Price: R2,911
Discovery Miles 29 110
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Early Development of the Shoulder Girdle and Sternum in Marsupials (Mammalia: Metatheria) (Paperback)
Series: Advances in Anatomy, Embryology and Cell Biology, 109
Expected to ship within 10 - 15 working days
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The development of the breast-shoulder apparatus in the Marsupialia
was inves tigated and compared with the conditions in Monotremata
and Placentalia. The results were achieved by the investigation of
material comprising altogether 109 histological serial sections of
intrauterine embryos, neonates, and pouch young from 11 marsupial
species. Additionally, 54 skeletons of subadult and adult
marsupials from 25 species were included for comparison. The
embryonic states show a strong similarity to the developmental
stage of the breast-shoulder apparatus in the monotremes. In
contrast, the adult breast-shoulder apparatus generally corresponds
to that in placentals. The following elements can be observed in
the marsupial breast-shoulder apparatus during embryogenesis:
scapula, metacoracoid, procoracoid, first rib, paired sternal
elements, unpaired sternal element, and clavicle. All the elements
mentioned together form a compact, continuous arch in both the
intrauterine embryos and the neonates. In the pouch young, this
arch is reduced rather soon after birth, so that a compact
connection between the left and the right half of the body no
longer exists. All that remains is a loose connection via the
clavicle. The metacoracoid becomes the processus coracoideus
scapulae. The procoracoid becomes the praeclavium. The unpaired
sternal element fuses with the paired sternal element, generating
the uniform manubrium sterni. The first rib takes its usual
position in the thorax. In the pouch young, the breast shoulder
apparatus as a whole already shows all the typical characteristics
that can be determined in adults.
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