Die Vorteile der aufgeschobenen Spalthauttransplantation und die Erweiterung ihres Anwendungsbereiches durch die Verwendung des Fibrinklebers

Zusammenfassung Die Vorteile der aufgeschobenen Spalthauttransplantation gegenüber der prim?ren Spalthautdeckung werden diskutiert, die Technik und unsere Erfahrungen aus einj?hriger Anwendungszeit der Methode werden berichtet. Bei besonderen. F?llen erm?glicht die Anwendung des Fibrinklebers ein gutes Ergebnis.

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Summary The advantages of the delayed skin grafting compared with primary skin grafting are discussed, the technique and our experiences in this method having been used clinically for one year are reported. In special cases the results improve by the use of the fibrin adhesive system.

     

Responses of visual cells in cat superior colliculus to relative pattern movement

Are there visual cells in the cat superior colliculus, selectively sensitive to relative pattern movement? Based on extracellular recordings from paralyzed pretrigeminal preparations, a sample of 76 collicular units could be divided into two main types according to relative movement sensitivity: those that responded optimally and selectively to one specific relative velocity between a small disk and a full-field grating; and those that discharged maximally whenever the grating shifted relative to a disk moving at one specific “absolute” speed, regardless of the precise relative velocity between the two. It was hypothesized that the latter group, in conjunction with extraretinal “calibration” cues, may be part of a neural mechanism encoding spatial depth in terms of motion parallax.     

Nitrous oxide modifies visual responses in the cat retina, striate cortex and superior colliculus

Extracellular records from 54 single cells in cat optic tract (14), visual cortex (18) and superior colliculus (22), have shown that ventilation of acute animals with a 70%: 30% mixture of N₂O/O₂ can modify unit responses to visual stimuli. Results indicate that, under nitrous oxide, (a) responses to flashed or moving stimuli may be severely reduced, and frequently abolished. This may be accompanied by either a sharp decrease; or, conversely, by a dramatic increase, in the resting discharge rate; (b) the degree of directional preference of a given unit, in response to a moving visual stimulus, may be substantially modified; (c) the temporal distribution of unit firing may be modified. While about half (57%) of the units in the optic tract were affected by N₂O, only 28% of cortical cells showed any N₂O-related response modification. The largest effect was observed in the superior colliculus, where 86% of cells were influenced by the anaesthetic. It is suggested that these results might be explained by a selective interference of N₂O with serotonergic transmitter mechanisms.