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Quarterly Journal of Microscopical Science, Vol s3-100, 285-298, Copyright © 1959 by Company of Biologists
1 Department of Zoology, University of Cambridge
The histology of the peripheral nervous system of Rhodnius has been re-investigated by the use of the osmium/ethyl gallate method of staining. The fusiform enlargements (beading) of the fine sensory axons, both below the epidermis and in the larger nerves, mark the points at which a mitochondrion lies in the axoplasm. The large motor axons contain many mitochondria; sometimes these form chains as much as 20 µ long.
The formation of the interaxonal substance in the nerves by the glial cells (Schwann cells) is well shown by this staining method.
The cytoplasmic component of the nerve-sheath (perineurium) contains abundant mitochondria; this layer, which is rich in enzymes, seems largely responsible for the permeability properties of the sheath. The connective tissue component (neural lamella) contains collagen.
In the thin-walled sensilla of the antennae (presumed chemoreceptors) the distal nerve process ends in a small orifice near the base of the hair (as described by Slifer in grasshoppers). The axons from the sense cells in the antenna fuse extensively; at least 15 sense cells to an axon. This does not happen in the sensory axons from the leg.
The nerve-endings in the ventral abdominal muscles are described and figured.
