Structural, Cytochemical and Functional Organization of Statocysts of Cephalopoda

Vinnikov, Ya. A.; Gasenko, O. G.; Bronstein, Alexander A.; Tsirulis, T. P.; Иванов, В. П.; Pyatkina, G. A.

doi:10.1007/978-1-4615-8618-0_3

Cited by 5 publications

(5 citation statements)

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“…Young (i960) mentioned an elaborate supracristal, cristal and infracristal nerve plexus at the level of light microscopy and discussed the fibres as most probably being efferent. Later, ultrastructural findings of vesicle filled profiles, some of which clearly being presynaptic, supported his idea (Barber 19660;Vinnikov et al 1967). The results o and recent neuroanatomical and electrophysiological findings, now leave no doubt that the elaborate plexus of fine fibres is efferent in n atu re:…”

Section: Crista Efferent Systemmentioning

confidence: 82%

“…Each crista section is composed of various types of large and small hair cells, supporting cells, and large neurons underneath and small neurons at the side (Young i960;Barber 1966a;Vinnikov et al 1967;Budelmann 1977). The large hair cells are arranged in regular rows parallel to the course of the crista ridge.…”

Section: Angular Acceleration Receptor Systemmentioning

confidence: 99%

“…Each hair cell bears numerous kinocilia, but it is morphologically polarized in only one direction, as defined by the orientation of the basal foot structure and the arrangem ent of the internal 9 x 2 + 2 tubuli contained in each kinocilium (figure 97) (Barber 1966 b;Budelmann 1977). The nature of the hair cells has been a subject of controversy (compare Young i960; Budelmann 1977): they were earlier considered to be prim ary receptor cells with an axon running from their base (Hamlyn-Harris 1903;Young i960;Barber 1966a;Vinnikov et al 1967); but electron micrographs of complete serial sections have shown that at least the large hair cells in the middle of the crista ridge are secondary sensory cells (Budelmann 1977). U ncertainty also exists about the nature of the neurons: they have been described as being neurosensory (Young i960) or glial cells ('dark cells'; Barber (1966a)).…”

Section: Angular Acceleration Receptor Systemmentioning

confidence: 99%

“…For ffeneral data on the gross morphology and fine structure of the Octopus crista, see Young ( t 96o), Barber (1966aBarber ( ,b, 1968, Vinnikov et al (1967), , and Budelmann (i977)-3.1. Morphometry of the crista ( 1, 2 and 4)…”

Section: R Esultsmentioning

confidence: 99%

“…There are about 1000 first-order afferent neurons in all nine crista sections, 85% of which are small and 15 % are large (table 4). The nature of these neurons has been a subject of much controversy (Owsjannikow & Kowalevsky 1867;Young i960;Barber 1966a;Vinnikov et al 1967;Aldred et a l. 1983). O ur data now clearly show that the neurons are postsynaptic to the large and small ventral secondary sensory hair cells; this characterizes the neurons as being first-order afferent neurons to these hair cells (see §4.1.5).…”

Section: Rista Cellular Organizationmentioning

confidence: 99%

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The angular acceleration receptor system of the statocyst of Octopus vulgaris : morphometry, ultrastructure, and neuronal and synaptic organization

Budelmann

Sachse

Staudigl

1987

Phil. Trans. R. Soc. Lond. B

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The angular acceleration receptor system (crista/cupula system) of the statocyst of Octopus vulgaris has been thoroughly reinvestigated, and detailed information is presented regarding its morphometry, ultrastructure, and neuronal and synaptic organization. In each of the nine crista sections, some receptor hair cells are primary sensory cells with an axon extending from their base. Also, there are large and small secondary sensory hair cells without axons, which make afferent synapses with large and small first-order afferent neurons. The afferent synapses are of two morphologically distinct types, having either a finger-like or a flat postsynaptic process; both can be seen in the same hair cell. In addition to the afferents, there is a dense plexus of efferent fibres in each crista section, and efferent synapses can be seen at the level of the hair cells and of the neurons. The morphometric analysis of the nine crista sections shows obvious differences between the odd-numbered (C1, C3, C5, C7, C9) and the even-numbered (C2, C4, C6, C8) crista sections: they differ in length, in the number of the small primary sensory cells and in the number of the small first-order afferent neurons. Centrifugal cobalt filling of the three crista nerves revealed a disproportionate innervation of the nine crista sections: the anterior crista nerve innervates section C1 and the first half of section C2, the medial crista nerve innervates the second half of section C2, sections C3, C4, C5, and the first half of section C6, and the posterior crista nerve innervates the second half of section C6, and sections C7, C8 and C9. In each of the three crista nerves, only 25% of the total number of axons are afferent fibres, the remaining 75 % are efferent. To each of the nine crista sections a cupula is attached. In the form and size of the cupulae there is again a conspicuous difference between the odd and the even crista sections: a small widebased cupula is attached to each of the odd crista sections, whereas the even crista sections each have a large narrow-based cupula with a small area of attachment. The results are discussed with reference to their functional consequences.

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Section: Crista Efferent Systemmentioning

confidence: 82%

Section: Angular Acceleration Receptor Systemmentioning

confidence: 99%

Section: Angular Acceleration Receptor Systemmentioning

confidence: 99%

Section: R Esultsmentioning

confidence: 99%

Section: Rista Cellular Organizationmentioning

confidence: 99%

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