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Some observations on the tusks of an Indian elephant the innervation of the pulp


, : Some observations on the tusks of an Indian elephant the innervation of the pulp. Anat Rec 76(1): 81-91

The pulp is presented as a cone with an elliptical base, 35.5 X 33.0 mm.; a slightly curved axis, the height of which from the center of the base to the apex is 112.8 mm.; and the apex inclines about 5[degree] from the vertical. As the crown of the tusk closes in during growth, a central tract of secondary dentin is formed which extends through the tooth. This tract contains a lesser number of irregular dentinal tubules, some lacunae, and what are evidently the remnants of enclosed and calcified capillaries. Both medullated and non-medullated fine nerve fibers enter the pulp at the base of the tusk and proceed toward the apex singly or in small fasciculi of 3-10 fibers. Some fibers pass in the walls of the entering arteries, while others are independent of them. A double nerve plexus is described in the adventitia of arteries and their branches. Neither definite nerve endings nor ganglion cells are observed around blood vessels. Nerve fibers traced peripherally lose their medullary sheaths beneath the layer of odontoblasts and as varicose fibers pass directly between the cells or enter, after a short course, tangential to their bases. The fibers terminate in simple bead-like endings at various levels, but none is traced beyond the peripheral ends of the bodies of the cells.

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