Infrastructure of an electroreceptor in the mormyrid fish Gnathonemus petersii I

Derbin, C.; Szabo, T.

J Ultrastruct Res 22(5/6): 469-484


Accession: 024864340

Download citation:  

Article/Abstract emailed within 1 workday
Payments are secure & encrypted
Powered by Stripe
Powered by PayPal

The tuberous organ, a specific cutaneous organ of Gnathonemus, represents 1 electro-receptor type in these weakly electric fish of Mormyridae. The structure of the sensory cell, as well as the presence of specific accessory cells, differentiates them from the common sense organs bearing hair cells as sensory elements. In the tuberous organ each sensory cell lies with almost its entire surface free in an intra-epidermal sensory chamber while the basal cell membrane is in contact with the subsensory platform through an opening of the sensory chamber. The neurosensory junctions, the only ones found between sensory cell membrane and nerve endings, have the same characteristics as the afferent sensory junction described in other sense organs. The epithelial cells of the epidermis overlying the tuberous organ have a strongly vacuolated cytoplasm and a particular organization. The subsensory platform is composed of 4 types (I-IV) of cells: 3 of them display a concentric organization around the nerve axis located between the basement membrane and the sensory cell. The cells of types I and II appear to have an excretory function in relation to the contents of the sensory chamber. The electrophysiological results are discussed on the basis of these morphological data.