Download Das Gehirn by Jacques-Michel Robert PDF

By Jacques-Michel Robert

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Sample text

Im fünften Schwangerschaftsmonat findet für den Fötus die bisherige Stille ihr Ende - von diesem Zeitpunkt an nimmt er von außen Stimmen oder auch Gesang wahr. Die ursprüngliche Gehörzone des Kortex entspricht der ersten Temporalwindung. Die Fasern des Hörnervs eines jeden Ohrs sind bilateral, in beiden Temporallappen, vertreten. Zu Beginn des zweiten Schwangerschaftsmonats bildet sich mit den Augenbläschen eine weitere paarige Ausstülpung des Neuralrohrs, aus der nach Einstülpung die Linsenplatte und das Pigmentepithel der Netzhaut hervorgehen, während der Augenbläschenstiel den Sehnerv liefert.

Wo liegen deren Ursachen, und gibt es eine Antwort darauf? Welche Folgen können diese Störungen haben? Sind die Nervenzellen des Gehirns in der Lage, diese Vorfälle zu verkraften und wieder die Leistungsfähigkeit ihrer Zellgenossen zu erreichen? All diese Fragen sollen im nächsten Kapitel genauer behandelt werden. Mögliche Störungen Bei einer gestörten Versorgung mit Glukose und Sauerstoff reagiert das Gehirn sofort. B. bei Gefäßausbuchtungen und -fehlbildungen). In manchen Fällen kommt es sogar zur Gefäßruptur.

Per Computer wurden alle Daten der Szintillatoren erfaßt und auf einem Bildschirm dargestellt. Jeder Region wurde dabei symbolisch eine bestimmte Farbe zugeordnet: Wenn der Patient seine rechte Hand bewegte, erhellte sich die für die Steuerung der Motorik zuständige Stirnregion auf der entgegengesetzten Seite (die motorischen Nervenbahnen laufen überkreuz). Wenn er seine Augen öffnete, leuchtete der Hinterhauptlappen (Okzipitallappen), in dem sich die Sehrinde befindet, auf. Ließ man den wachen Patienten im Dunkeln mit verschlossenen Ohren »denken«, dann reagierte die präfrontale Rindenregion, die nur beim Menschen gut entwickelt ist.

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