caa a22 4500 477096255 CHVBK 20180405111528.0 cr unu---uuuuu 170330e19960801xx s 000 0 eng 10.1007/BF00195009 doi (NATIONALLICENCE)springer-10.1007/BF00195009 An ultrastructural study of the perichondrium in cartilages of the chick embryo [Elektronische Daten] [A. Bairati, M. Comazzi, M. Gioria] The ultrastructure of perichondrial tissue of cartilage rudiments (metatarsus, tibiotarsus and sternum) of the chick embryo at various stages of development (H.H. stages 28-45) was investigated by transmission electron microscopy. Previous microscopic and submicroscopic data were generally confirmed, but new findings indicated: (a) the existence of a temporary syncytial state of perichondroblasts during the earliest developmental stages, (b) the existence of a perichondrial cambial layer of stem cells, (c) involvement of perichondroblasts in the appositional growth of cartilage. Electron microscopy revealed clear temporal relations between cell differentiation, perichondrial growth and the structure and production of perichondrial ECM. In addition, the boundaries between cartilage and perichondrial tissue were demonstrated unambiguously. Perichondrial structure varied specifically with each cartilage segment; in particular the perichondrium in long bone rudiments (where ossification starts early) contrasted with that in the permanent cartilage medial process of the sternum. Springer-Verlag, 1996 Chick rudiments nationallicence Development nationallicence Syncytium nationallicence Stem cells nationallicence Gallus gallus nationallicence Bairati A. Dipartimento di Fisiologia e Biochimica Generali, Sezione di Istologia ed Anatomia Umana, Via Celoria 26, I-20133, Milano, Italy aut Comazzi M. Dipartimento di Fisiologia e Biochimica Generali, Sezione di Istologia ed Anatomia Umana, Via Celoria 26, I-20133, Milano, Italy aut Gioria M. Dipartimento di Fisiologia e Biochimica Generali, Sezione di Istologia ed Anatomia Umana, Via Celoria 26, I-20133, Milano, Italy aut Anatomy and Embryology Springer-Verlag 194/2(1996-08-01), 155-167 0340-2061 194:2<155 1996 194 429 https://doi.org/10.1007/BF00195009 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00195009 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bairati A. Dipartimento di Fisiologia e Biochimica Generali, Sezione di Istologia ed Anatomia Umana, Via Celoria 26, I-20133, Milano, Italy aut NATIONALLICENCE 700 1- Comazzi M. Dipartimento di Fisiologia e Biochimica Generali, Sezione di Istologia ed Anatomia Umana, Via Celoria 26, I-20133, Milano, Italy aut NATIONALLICENCE 700 1- Gioria M. Dipartimento di Fisiologia e Biochimica Generali, Sezione di Istologia ed Anatomia Umana, Via Celoria 26, I-20133, Milano, Italy aut NATIONALLICENCE 773 0- Anatomy and Embryology Springer-Verlag 194/2(1996-08-01), 155-167 0340-2061 194:2<155 1996 194 429 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer