By Milan Klima
The improvement of the breast-shoulder equipment within the Marsupialia was once inves tigated and in comparison with the stipulations in Monotremata and Placentalia. the consequences have been accomplished through the research of fabric comprising altogether 109 histological serial sections of intrauterine embryos, neonates, and pouch younger from eleven marsupial species. also, fifty four skeletons of subadult and grownup marsupials from 25 species have been incorporated for comparability. The embryonic states exhibit a robust similarity to the developmental level of the breast-shoulder gear within the monotremes. by contrast, the grownup breast-shoulder gear ordinarily corresponds to that during placentals. the next parts could be saw within the marsupial breast-shoulder gear in the course of embryogenesis: scapula, metacoracoid, procoracoid, first rib, paired sternal parts, unpaired sternal aspect, and clavicle. all of the components pointed out jointly shape a compact, non-stop arch in either the intrauterine embryos and the neonates. within the pouch younger, this arch is lowered relatively quickly after beginning, in order that a compact connection among the left and the suitable half the physique now not exists. All that is still is a free connection through the clavicle. The metacoracoid turns into the processus coracoideus scapulae. The procoracoid turns into the praeclavium. The unpaired sternal aspect fuses with the paired sternal aspect, producing the uniform manubrium sterni. the 1st rib takes its traditional place within the thorax. within the pouch younger, the breast shoulder gear as an entire already exhibits all of the regular features that may be decided in adults.
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Additional resources for Early Development of the Shoulder Girdle and Sternum in Marsupials (Mammalia: Metatheria)
28A-M. Clavicle, praeclavium, sternum, and ribs in adult and subadult marsupials. A-C Trichosurus vulpecula. D Phalanger gymnotis. E Petaurus australis. F Petaurus breviceps. G Pseudocheirus lemuroides. H Phascolarctos cinereus. I Vombatus ursinus. J Wallabia rufogrisea. K Macropus robustus. L Macropus gigantea. M Petrogale penicillata the processus xiphoideus, have also developed much more massively in Phascolarctos cinereus than in most of the other marsupials. , climbing in trees and clinging to trunks and branches.
0 mm). 5-mm-Iong embryos of Trichosurus. Mesenchymatous condensations in the anlage of the breast-shoulder apparatus can be recognized in the area of the coracoid-scapular plate. The anlagen of the clavicle and of the ribs are also visible. The anlagen of the sternum do not yet exist. 5 mm). This stage may be compared with those of the 11- to 12-mm-Iong embryos of Trichosurus and the 11- to 13-mm-Iong embryos of Phascolarctos. It is the ontogenetically significant stage in which, in the region of the breast-shoulder apparatus, the sternal bands are just begInning to have contact in the median plane (Figs.
Its cranial tip is only slightly developed. , the sternebrae and 51 M Fig. 28A-M. Clavicle, praeclavium, sternum, and ribs in adult and subadult marsupials. A-C Trichosurus vulpecula. D Phalanger gymnotis. E Petaurus australis. F Petaurus breviceps. G Pseudocheirus lemuroides. H Phascolarctos cinereus. I Vombatus ursinus. J Wallabia rufogrisea. K Macropus robustus. L Macropus gigantea. M Petrogale penicillata the processus xiphoideus, have also developed much more massively in Phascolarctos cinereus than in most of the other marsupials.