500
M. V. L. BENNETT
Fig. 5. Distribution of tonic, ampullary electroreceptors of the transparent catfish, Kryptopterus bicirrhus. Each small spot represents a receptor. The direction
toward which the ampulla opens is indicated in several places (see also Fig. 16).
From Wachtel and Szamier (1969).
is by the lateral line nerves (Dijkgraaf, 1968; Roth, 1969). Ampullae of
Lorenzini are found in most elasmobranchs (Dotterweich, 1932). The
distribution varies with the species and is diagrammed for a skate in Fig.
6 and for a shark in Fig. 7. Again, the innervation is by the lateral line
nerves (Fig. 7 ) .
There are differing usages as to whether the lateral line nerves are
termed part of the eighth nerve, acoustico-lateralis system or whether
different branches are considered part of the facial and vagal nerves
( Figs. 2, 4, and 7 ) . The central connections are those of acoustico-lateralis
system, and the former terminology seems preferable (Berkelbach van
der Sprenkel, 1915).
In freshwater electric fish, electroreceptors are generally visible under
Fig. 6. Ampulla of Lorenzini of the skate Raja. The canals on dorsal and ventral
surfaces are shown on left and right, respectively. The canal openings are indicated
by dots. From Murray ( 1962).
M. V. L. BENNETT
Fig. 5. Distribution of tonic, ampullary electroreceptors of the transparent catfish, Kryptopterus bicirrhus. Each small spot represents a receptor. The direction
toward which the ampulla opens is indicated in several places (see also Fig. 16).
From Wachtel and Szamier (1969).
is by the lateral line nerves (Dijkgraaf, 1968; Roth, 1969). Ampullae of
Lorenzini are found in most elasmobranchs (Dotterweich, 1932). The
distribution varies with the species and is diagrammed for a skate in Fig.
6 and for a shark in Fig. 7. Again, the innervation is by the lateral line
nerves (Fig. 7 ) .
There are differing usages as to whether the lateral line nerves are
termed part of the eighth nerve, acoustico-lateralis system or whether
different branches are considered part of the facial and vagal nerves
( Figs. 2, 4, and 7 ) . The central connections are those of acoustico-lateralis
system, and the former terminology seems preferable (Berkelbach van
der Sprenkel, 1915).
In freshwater electric fish, electroreceptors are generally visible under
Fig. 6. Ampulla of Lorenzini of the skate Raja. The canals on dorsal and ventral
surfaces are shown on left and right, respectively. The canal openings are indicated
by dots. From Murray ( 1962).