Address upon the development of the brain / by Wilhelm His.

  • His, Wilhelm, 1831-1904.
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: Address upon the development of the brain / by Wilhelm His. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    formation they follow eacli other in a curve, or rather in a broken line. Owing to this curve the extremity of the brain canal is turned ventrally, and it extends beyond the extremity of the notochord and of the alimentary canal (Fig. 1). Fig. 1. Photographic reproduction of black-board drawing made by Prof. His for his Lecture. 13. Diagrammatic representation of early condition of the neural tube, showing the manner in which it becomes bent on itself. A. Diagrammatic representation of a mesial longitudinal section through the head and neck of a human embryo. The brain-flexures and the optic vesicle are seen, and the manner in which the fore-brain is bent around the anterior extremity of the notochord and fore- gut is indicated. The early heart is shown bulging out in front of the foregut. The different sub-divisions of the brain are marked off from each other by dotted lines. In both diagrams (A as well as 13) a dotted line running in the long axis of the neural tube indicates the separation of the alar from the basal lamina of the lateral wall.