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Wednesday, July 29, 2020 | History

3 edition of Electrical properties and fine structure of the ampullary canals of Lorenzini. found in the catalog.

Electrical properties and fine structure of the ampullary canals of Lorenzini.

Bernard Waltman

Electrical properties and fine structure of the ampullary canals of Lorenzini.

by Bernard Waltman

  • 138 Want to read
  • 36 Currently reading

Published in Stockholm .
Written in English

    Subjects:
  • Electric organs in fishes.,
  • Rays (Fishes)

  • Edition Notes

    Bibliography: p. 57-59.

    SeriesActa physiologica Scandinavica, v. 66. Supplementum, 264
    Classifications
    LC ClassificationsQL639 .W34
    The Physical Object
    Pagination59 p.
    Number of Pages59
    ID Numbers
    Open LibraryOL4380731M
    LC Control Number78650025

    In , Stefano Lorenzini first described a network of organs of unknown function in the torpedo ray—the ampullae of Lorenzini (AoL). An individual ampulla consists of a pore on the skin that is open to the environment, a canal containing a jelly and leading to .   Waltman B., Electrical properties and fine structure of the ampullary canals of Lorenzini. Acta Physiol. Scand. Suppl. , 1–60 (). [ Abstract ] [ Google Scholar ].

    On occasions when the dipole was perpendicular to the plane of the disk, the electrical field energy absorbed by ampullary groups decreased significantly. Calculations suggested that by reorienting its body the fish is able to phase out signals coming from dipoles with their axes on different planes from that of the skate's body. (). Electrical properties and fine structure of the ampullary canals of Lorenzini. (). Injections of calcium ions into spinal motoneurones.J. (). Intracellular calcium injection activates potassium conductance in Aplysia nerve cells. Fed. ().

    Electrical properties and fine structure of the ampullary canals of Lorenzini. Waltman B. Acta Physiol Scand Suppl, , 01 Jan Cited by: 17 articles | PMID: [Effective stimulation of Turkestan catfish electroreceptors] Broun GR, Mamadaliev A. Electrical properties and fine structure of the ampullary canals of Lorenzini. (). Improvements in epoxy resin embedding methods. (). Junctional complexes in various epithelia. (). Membrane potentials of the lobster giant axon obtained by use of the sucrose-gap technique.


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Electrical properties and fine structure of the ampullary canals of Lorenzini by Bernard Waltman Download PDF EPUB FB2

Get this from a library. Electrical properties and fine structure of the ampullary canals of Lorenzini. [Bernard Waltman]. Acta Physiol Scand Suppl. ; Electrical properties and fine structure of the ampullary canals of Lorenzini. Waltman B. PMID:Cited by: The ampullae of Lorenzini are well-known to generations of students of Zoology as the jelly-filled canals exposed whenever the head of a dogfish or ray is skinned during elementary dissection by: The ampullae of Lorenzini (Figures and ) are modified parts of the lateral line system (see later) and primarily sensitive to electrical fields (they can help a shark sense prey by detecting the electrical fields generated by activities of the prey).

They form a series of tube-like structures just beneath and parallel to the skin. Ampullae of Lorenzini in freshwater Carcharhinus leucas consist of canal walls composed of four cell types at various positions along the canal.

The canal wall is lined with large hillock-shaped cells that apparently secrete copious amounts of a mucopolysaccharide gel that fills the ampullary canal ().Basal to these hillock cells are squamous epithelial cells, which do not appear to Cited by: The ampulla of Lorenzini is the functional electrosensory unit that consists of a small subdermal ampulla and a canal that projects to a surface pore on the head or pectoral fins.

These sensory organs help fish to sense electric fields in the water. Each ampulla consists of a jelly-filled canal opening to the surface by a pore in the skin and ending blindly in a cluster of small pockets full of special jelly like substance.

The ampullae are mostly clustered into groups inside the body, each cluster having ampullae connecting with different parts of the skin, but. Potamotrygon lacks ampullae of Lorenzini (defined by their long canals), otherwise general for elasmobranchs. There are present however microscopic ampullary organs with extremely short canals.

A brief histologic description is provided, together with. The ampullary organ structure differs from all other previously described ampullae in the canal wall structure, the general shape of the ampullary canal, and the apically nucleated supportive cells.

Waltmann, B. () Electrical properties and fine structure of the ampullary canals of Lorenzini. Ada Physiol. Scand., 66 Suppl.

6C). The discharge rate thereby depends on (1) the oscillation period and (2) the probability of spike triggering. Preliminary results from discharge pattern analysis during dynamic responses indicate. Waltman, Electrical properties and fine structure of the ampullary canals of Lorenzini. Acta Physiol.

Scand. Suppl. Waltman, B. () Electrical properties and fine structure of the ampullary canals of Lorenzini. Acta Physiol. Scand., Suppl.Wilson, J.T.

and Martin, C.J. () On the peculiar rod-like tactile organs in the integument and mucous membrane of. Electrical properties and fine structure of the ampullary canals of Lorenzini. Electroreceptor mechanisms: the relation of impulse frequency to stimulus strength and responses to pulsed stimuli in the ampullae of Lorenzini of elasmobranchs.

InStefano Lorenzini first described a network of organs of unknown function in the torpedo ray—the ampullae of Lorenzini (AoL). An individual ampulla consists of a pore on the skin that is open to the environment, a canal containing a jelly and leading to an alveolus with a series of electrosensing cells.

The role of the AoL remained a mystery for almost years until research. a Schematic presentation of an ampulla of Lorenzini of the multialveolate type. The left side of the ampulla is opened to visualize epithelia of the canal, medial zone and alveoli. Waltman B.

Electrical properties and fine structure of the ampullary canals of Lorenzini. Acta Physiol Scand Suppl. ; – Articles from The Journal of General Physiology are provided here courtesy of The Rockefeller University Press. The Lorenzinian Ampullae of Polyodon spathula Waltman, B.: Electrical properties and fine structure of the ampullary canals of Lorcnzini.

Acta physiol, scand. 66, Suppl.(). Wcrs~ll, J.: Studies on the structure and innervation of the sensory epithelium of. Magnetite crystallites in bacteria and the ampullae of Lorenzini of the elasmobranch fish seem the only clear cases.

Magnetoreception may also be the only perceptual sense found in animals for which a similar sense is not manifest in humans. Waltman, B.Electrical properties and fine structure of ampullary canals of Lorenzini, Acta.

function for the organs when he noted the unusual thickness of the canal walls (Lorenzini, ), and fine structure of the ampullary canals of alters the electrical properties of the. The effects of chemical, thermal stimuli, Ca 2+, Mg 2+ and L-glutamate (L-GLU) on resting and evoked activity of the ampullae of Lorenzini of the skate were studied.

The diluted sea water applied to the opening of the ampullae canal caused an increase in the firing rate of the nerve fibres followed by gradual adaptation. Fine structure of ampullary.

Electrical properties and fine structure of the. The ampullary canal is composed of 1–2 layers of flattened squamous epithelial cells, the basement membrane.Electrical properties and fine structure of the ampullary canals of Lorenzini.

Acta Physiologica Scandinavica (Suppl.) * Pengarang untuk surat-menyurat ; email: [email protected](). Electrical characterization of gel collected from shark electrosensors. (). Electrical properties and fine structure of the ampullary canals of Lorenzini. (). Electroreception and the compass sense of sharks.

(). Electroreception in juvenile .