Neurogenesis in the procerebrum
of the snail Helix aspersa: a quantitative analysis.
(2001) reported that the metacerebro-procerebral neuron (MPN) of Limax marginatus is an output-neuron from the procerebrum
. The MPN receives monosynaptic inputs from the superior and inferior tentacle nerves.
This part of their nervous system, the procerebrum, is unique among gastropod nervous systems in that it has 20,000 to 50,000 small neurons of uniform size (Zs.-Nagy and Sakharov, 1970; Chase, 2000; Zaitseva, 2000) that process sensory information from the olfactory tentacles (Gelperin and Tank, 1990; Ratte and Chase, 2000).
In the terrestrial snail Helix luco rum, migration of neurons into the procerebrum has been shown during the first 30 days of post-hatch growth (Zakharov et al., 1998).
In this paper I show three possible sources of neuron addition to the procerebrum. Cerebral tubes, described here in H.
35-42) review regeneration in neural tissues ranging from mollusc to mammal with particular emphasis on the snail Umax, which has the ability to regenerate its procerebrum
without an external intervention.
In fact, the procerebrum and other parts of the cerebral ganglion are derived from distinct ectodermal invaginations, which arise during development and fuse into a single structure at a late stage (Van Mol, 1967; Chase, 2000).
Interganglionic dendrites constitutean output pathway from the procerebrum of the snail Achatina fulica.
Model for olfactory discrimination and learning in Limax procerebrum incorporating oscillatory dynamics and wave propagation.
(iii) The anterior dorsal region of the cerebral ganglia tends to differentiate into association or integration centers, as seen in the procerebrum of pulmonates (Hanstroem, 1928; Bargmann, 1930; Van Mol, 1967; Chase and Tolloczko, 1989; and see Chase, 2002, for a recent review).
Interganglionic dendrites constitute an output pathway from the procerebrum of the snail Achatina fulica.
In the olfactory center (the procerebrum
) of Limax, bursting neurons possess a chloride-channel-coupled GLU-receptor that seems to be involved in the propagation of oscillatory activities (Watanabe et al., 2003).