Abstract

The longitudinal stretch receptor of the cockroach ( Blaberus) consists of a single multipolar neuron associated with a strand of connective tissue. Schwann cells invest the axon, cell body, and dendrites. The terminal regions of the dendrites are naked and embedded in the connective tissue matrix. There are no connexions between the naked sensory endings and the collagen-like connective tissue fibrils. Mitochondria are the only prominent cytoplasmic inclusion in the dendritic terminations. The ultrastructure is compared with that of vertebrate and invertebrate mechanoreceptors and correlated with electrophysiological data.

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