Elements of histology / by E. Klein.

  • Klein E. (Edward), 1844-1925.
Date:
1883
Catalogue details

Licence: Public Domain Mark

Credit: Elements of histology / by E. Klein. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    Chap. XIV.] Nerve-fibres. ioS which form an intercommunicating system, and anastomose with the lymphatics of the epineurium whence they can be injected. Between the lamellae, and ia the spaces, are situated flattened endotheloid connective tissue corpuscles. The nerve-bundles are either single or compoxmd. In the former the nerve-fibres contained in a bundle are not sub-divided into groups, in the latter the bundles are sub-divided by thicker and thinner septa of fibrous connective tissue connected with the peri- neurium. When a nerve-bundle divides—as when a trunk repeatedly branches, or when it enters on its peri- pheral distribution—each branch of the bundle receives a continuation of the lamellar perineurium. The more branches the perineurium has to supply, the more re- duced it becomes in thickness. In some of these minute branches the perineurium is reduced to a single layer of endothelial cells. When one of these small bundles breaks up into the single nerve-fibres, or into small groups of them, each of these has also a continuation of the fibrous tissue of the perineurium. In some places this perineural continuation is only a very delicate endothelial membrane, at others it is of considerable thickness, and still shows the laminated nature. Such thick sheaths of single nerve-fibres, or of small groups of them, represent what is called Henle's sheath. 138. The nerve-fibres are held together within the bundle by connective tissue, called the Endoneurium (Fig. 64). This is a homogeneous ground substance in which are embedded fine bundles of fibrous connective tissue, and connective tissue corpuscles, and capillary blood-vessels arranged so as to form a network with elongated meshes. Between the perineurium and the nerve-fibres are found here and there lymph spaces; similar spaces separate the individual nerve-fibres, and have been injected by Key and Eetzius.