410
M. V. L. BENNETT
Fig. 36. Anatomy of the electric organ of Eigenmannia. Organ isolated from
osniic acid fixed material. Dorsal up, rostra1 to the right viewed from the lateral
surface. ( A ) Low power view. The five columns of electrocytes are numbered
dorsoventrally. Two segmental nerves ( n ) run ventroposteriorly and give off
branches to the electrocytes. A complete cell of column 4 is seen most clearly. The
small spots on the cells are nuclei. The posterior, innervated ends of the cells are
more darkly stained. There is little extracellular space between cells, and the cells
usually overlap somewhat in the longitudinal axis. ( B ) The anterior end of a cell
of column 3 lies lateral to the next cell anteriorly, and is similarly overlapped by
the cell caudal to it. ( C ) Details of innervation of a cell from column 4. ( D )
Innervation of the anterior cell from column 5 in A. Magnifications the same in
A and B and in C and D.
M. V. L. BENNETT
Fig. 36. Anatomy of the electric organ of Eigenmannia. Organ isolated from
osniic acid fixed material. Dorsal up, rostra1 to the right viewed from the lateral
surface. ( A ) Low power view. The five columns of electrocytes are numbered
dorsoventrally. Two segmental nerves ( n ) run ventroposteriorly and give off
branches to the electrocytes. A complete cell of column 4 is seen most clearly. The
small spots on the cells are nuclei. The posterior, innervated ends of the cells are
more darkly stained. There is little extracellular space between cells, and the cells
usually overlap somewhat in the longitudinal axis. ( B ) The anterior end of a cell
of column 3 lies lateral to the next cell anteriorly, and is similarly overlapped by
the cell caudal to it. ( C ) Details of innervation of a cell from column 4. ( D )
Innervation of the anterior cell from column 5 in A. Magnifications the same in
A and B and in C and D.