By H. Aldskogius

In the former learn (Part I) an outline was once given of the ultrastructural alterations happening in the course of oblique Wallerian degeneration within the intramedullary root fibre area of the kitten hypoglossal nerve. one of many impressive beneficial properties of this degeneration strategy used to be the looks at an early degree of micro­ glial cells thoroughly coated via myelin, which it appears participated in phago­ cytosis of degenerating axoplasm and to a small quantity in their personal myelin masking. proof was once acquired indicating that the varied degenerating glial cells noticeable a little bit later within the degeneration strategy have been derived from those myelin-covered microglial cells. for the reason that glial cells of the sort defined within the prior learn have by no means been implicated within the technique of direct Wallerian degeneration, the chance exists that they could in truth be attribute for oblique Wallerian degeneration. even though, this probability can't be properly assessed until our current particularly scanty wisdom in regards to the early glial response in the course of direct Wallerian degeneration is prolonged. hence the current research has been undertaken to check the ultrastructural adjustments in the course of direct W allerian degeneration within the kitten, with specific connection with the potential prevalence of myelin-covered microglial cells and degenerating glial cells of the sort defined within the prior learn (see half I). considering the fact that no systematic extremely­ structural learn on direct Wallerian degeneration in immature animals appear to exist, observations on alterations within the myelinated nerve fibres and the differing kinds of glial cells were included.

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Extra resources for Indirect and Direct Wallerian Degeneration in the Intramedullary Root Fibres of the Hypoglossal Nerve: An Electron Microscopical Study in the Kitten

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31. 2 days at operation, 7 days survival. Above, membrane-bounded body containing a great number of closely packed ribosome-sized granules. In the surrounding cytoplasm several ribosomes (rib) can be seen and one Iipid droplet (ld). X 45000 3 Adv. Anatomy, Vol. 50/1 Fig. 35. 5 days at operation, 15 days survival. Longitudinal section. Part of a myelin-covered microglial cell (nucleus = nu). The nuclear membrane is poorly outlined. arge vacuoles (vac) and several membrane-bounded bodies. Three of them have a lamellated content (arrows).

Alternatively, they might contain glial cell cytoplasm from other glial cells and thus be heterophagosomes (DeDuve and Wattiaux, 1966). This second possibility seems less likely than the first, however. The appearance of autophagosomes in myelin-covered microglial cells may indicate that such cells are under some kind of metabolic stress (cf. Daniel and Strich, 1969). Augmented autophagy often occurs in cells subjected to sublethal injury (for reviews see DeDuve and Wattiaux, 1966; Ericsson, 1969).

Lamellated structures electron-dense axoplasmic fragments or degenerating glial cells were not found in any perivascular cell. No pictures were seen suggesting a migration of cells through the basement membrane either into or from the interstitial space nor were any pictures obtained suggesting cell migration through the vessel wall. Mitotic cells Mitotic cells were observed more frequently than in the control material or than in experimental material taken from the unoperated side. Most of these cells occurred from 1 to 2 weeks postoperatively.

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