In the previous study (Part I) a description was given of the ultrastructural changes occurring during indirect Wallerian degeneration in the intramedullary root fibre region of the kitten hypoglossal nerve. One of the striking features of this degeneration process was the appearance at an early stage of micro- glial cells completely covered by myelin, which apparently participated in phago- cytosis of degenerating axoplasm and to a small extent of their own myelin covering. Evidence was obtained indicating that the numerous degenerating glial cells seen somewhat later in the degeneration...
In the previous study (Part I) a description was given of the ultrastructural changes occurring during indirect Wallerian degeneration in the intramed...
References ...42 Subject Index ...48 Author Index...50 ...6 Introduction Chondrification of the somitic mesoderm producing the primordia of the vertebrae has been a favourite topic of investigation by those interested in understanding the me- chanisms underlying development and differentiation. Study of this tissue involves the investigation of cell proliferation, migration and cytodifferentiation, synthesis of extra cellular matricial products, inductive tissue interactions, and tissue morphogenesi- some of the major unsolved problems of modern developmental biology. The topic is a large one...
References ...42 Subject Index ...48 Author Index...50 ...6 Introduction Chondrification of the somitic mesoderm producing the primordia of the verteb...
According to the classical theory of functional structure of bone which was developed by J. Wolff (1884, 1892) and W. Roux (1895) following the investigations of the functional architecture of the substantia spongiosa by H. von Meyer (1867), bone is "functionally" laid down in gross form as well as in minute architecture in accordance with the "maximum-minimum-law". As a result of functional adaptation, a maximum of efficiency is achieved with a minimum of material (Kummer, 1962a). In this sense functional adaptation is a reaction of adaptation of the idiotype-within the bounds of the...
According to the classical theory of functional structure of bone which was developed by J. Wolff (1884, 1892) and W. Roux (1895) following the invest...
The structure and innervation of the juxtaglomerular apparatus are examined by both light and electron microscopy, using series of semithin and thin sections. At the vascular pole of the renal corpuscle, granulated and nongranulated epithelioid cells, Goormaghtigh's cells and mesangial cells, as well as adjacent smooth muscle cells, are all connected to each other. Due to their fine structure, their topographical conti- nuity, and the numerous gradual stages of transformation, the different components of the vascular wall are defined as ramified smooth muscle cells (epithelioid cells), which...
The structure and innervation of the juxtaglomerular apparatus are examined by both light and electron microscopy, using series of semithin and thin s...