Principal and secondary visual inputs are processed in separate pathways with distinct neuropil
regions, including separate laminae and medullae (Strausfeld and Barth, 1993; Strausfeld et al.
The ir nerve fibers were detected throughout the neuropils
of the ganglion, especially in the dorsal and ventral horns (Fig.
In branchiopods, there are always only two visual neuropils
and they are not linked by crossing fibers.
In these animals, such chemosensory information is conveyed to the central nervous system through two anatomically distinct but parallel pathways: the aesthetascolfactory lobe pathway and the non-aesthetasc-lateral antennular neuropil
pathway, which are reciprocally connected by local olfactory interneurons (Schmidt et al.
The immunoreactivity of both types of nerve fibers were also found throughout the neuropils
of the ganglia, especially in the dorsal and ventral horn regions, (Fig.
A second possible supportive structure found in this study consisted of ubiquitous fibrous bodies in the neuropils
and axonal bundles.
Antennular withdrawal motoneurons in the lateral antennular neuropil
of Callinectes sapidus.
The dorsal lobe is located in the dorsal region of the anterior and posterior lobes, which are characterized by small neuropils
(asterisks in Fig.
In contrast, no cellular elements displaying GLU-L immunoreactivity could be found during embryogenesis, apart from a few sensory elements localized in the tail and a strong but partly undifferentiated immunoreactivity in the ganglion neuropils
This region of glomerular neuropil
has proved to be enigmatic in both its functional significance and its capricious appearance across taxa (Sandeman and Sandeman, 1994; Sandeman et al.
By day 4, the various 5-HT-containing fibers became more intensely stained as they projected into the neuropil
and velum, with the elaboration of velar and apical innervation continuing through days 5 and 6 (Fig.
In the CG, as in crustacean ganglia generally, synaptic interactions occur in complex neuropils
formed by collateral processes and branches from axons (Alexandrowicz, 1932, 1934, 1952; Obsawn, 1972; Aizu, 1975; Hawkins and Howse, 1978; Mirolli et at.