ISSN:
1432-0878
Schlagwort(e):
Statocyst
;
Octopus vulgaris (Cephalopoda)
;
Gravity receptor system
;
First-order neurons
;
Synaptic organization
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Summary The neuronal and synaptic organization of the sensory epithelium (macula) of the gravity receptor system of Octopus vulgaris was investigated by serial electron microscopic reconstruction. Three different types of afferent neurons, unipolar, bipolar, and multipolar, are described. Afferent synapses exist between the secondary sensory cells (hair cells) and the afferent neurons. Consequently, the neurons are first-order neurons. Two morphologically distinct types of afferent synapses could be identified: the most common type, present on every hair cell, has a finger-like postsynaptic process; the second type, which does not occur on every hair cell, has a flat or somewhat curved postsynaptic process. As a rule, the hair cells each form synapses with more than one afferent neuron. The neurons, in turn, form synapses with more than one hair cell. A complicated arrangement of efferent synapses was found at the level of both the hair cells and the neurons. The results are discussed with reference to their physiological consequences.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00220653
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