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DEVELOPMENT OF THE SHOULDER OF OPOSSUM,Didelphys virginiana, IN RELATION TO ORIGIN OF LIMB MUSCULATURE.
Author(s): 
Pages: 123-130
Year: Issue:  1
Journal: Acta Anatomica Sinica

Keyword:  肢芽肩部肌肉肌节实验胚胎学腹侧负鼠中胚层Harrison研究工作鼠胚;
Abstract: It has long been controversial whether or not the limb musculatureoriginates from the myotome. On the basis of morphological evidence foundin the study of the development of the shoulder of the opossum, Didelphysvirginiana the present paper presents some facts in support of the latter view. In the early stage of development, there is a set of venous network, theborder veins, interposed between the primorial dermis of the limb bud on theone hand and the premuscular and precartilage anlagen on the other. Theborder veins can be traced in subsequent stages of development to the subcu-taneous veins of the adult. Furthermore, the celluler structures of the primordialdermis and the two anlagen are found to be quite different, while the twoanlagen themselves are close resemble except in their degree of staining. Theconnections of the primitive dermis with the dermatome and the connectionsof the precartilage and premuscular anlagen with the somatopleure have beendefinitely observed. The above structural relationships have been observed alsoin the hindlimb of the opossum and in other vertebrates except fish. Itseems justified to conclude thet the dermis and subcutaneous tissue of thelimb bud orginate from the dermatome and that the skeletal muscular ele-ments originate from the somatopleure.
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