Studies on the Innervation of Bone Marrow with Special Reference to the Intramedullary Nerve Fibers in Dog and Goat

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Abstract
Histological studies on nerve fibers distributed in the bone marrow of young dogs and young goats have been performed, using silver staining methods.1. The nerves to be distributed in the bone marrow enter the medullary cavity through foramina nutricia in the form of a bundle of mixed nerve fibers, consisting of myelinated and non-myelinated ones. They are divided into two groups, nonvascular independent nerves and vascular proper ones.In addition, there are other nerve fibers which enter the medullary cavity through HAVERSian canals.2. The non-vascular independent and the vascular proper nerves form primary plexuses jointly and then give rise to simpler secondary plexuses.3. There are no nerve cells in the primary and the secondary nerve plexuses.4. Such nerve fibers as derived from these nerve plexuses form non-branching free endings of sensory nerve fibers in the interstitial tissue and also form terminal networks of vegetative nerve fibers on the walls of blood capillaries and venous sinuses and in the interstitial tissue.5. It has been ascertained that no terminal network of vegetative nerve fibers envelops free cells directly. This confirmation is different from the result reported by TAKEYAMA, but agrees with that published by STÖHR.

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