Eye of Navanax: Optic activity, circadian rhythm and morphology

Daily and Seasonal Rhythms

“…The rhythm in the isolated eye was discovered by Jacklet (488) in studies on the eye of Aplysia californica . Subsequently, similar rhythms were documented in other species of Aplysia (489, 490), Navanax inermis (288), Bulla gouldiana (103), and Bursatella leachi plei (101). In each of these species, circadian rhythms are expressed in the frequency of large‐amplitude compound action potentials in the optic nerve that arise from a population of electrically coupled cells in the eye.…”

Daily and Seasonal Rhythms

“…The rhythm in the isolated eye was discovered by Jacklet (488) in studies on the eye of Aplysia californica . Subsequently, similar rhythms were documented in other species of Aplysia (489, 490), Navanax inermis (288), Bulla gouldiana (103), and Bursatella leachi plei (101). In each of these species, circadian rhythms are expressed in the frequency of large‐amplitude compound action potentials in the optic nerve that arise from a population of electrically coupled cells in the eye.…”

Variations in the retinal designs of pulmonate snails (Mollusca, Gastropoda): squaring phylogenetic background and ecophysiological needs (I)

“…Of all the gastropods with well-developed cameratype eyes studied, only the opisthobranch Navanax inerrnis possesses an eye with a "bi-lobed" lens and a non-hemispherical retina (Eskin & Harcombe 1977).…”

Opsin-like immunoreactivity in the circadian pacemaker neurons and photoreceptors of the eye of the opisthobranch mollusc Bulla gouldiana

“…The eyes of several opisthobranch molluscs contain a pacemaker that generates a circadian rhythm in the fre quency of spontaneous optic nerve impulses (Jacklet 1969;Eskin and Harcombe 1977;Eskin 1979;Block and Roberts 1981;Block and Wallace 1982). These impulses are large (-100 p.V) compound action potentials that re sult from the simultaneous firing of a population of elec trically coupled retinal cells.…”

Daily and Seasonal Rhythms

“…The rhythm in the isolated eye was discovered by Jacklet (488) in studies on the eye of Aplysia californica . Subsequently, similar rhythms were documented in other species of Aplysia (489, 490), Navanax inermis (288), Bulla gouldiana (103), and Bursatella leachi plei (101). In each of these species, circadian rhythms are expressed in the frequency of large‐amplitude compound action potentials in the optic nerve that arise from a population of electrically coupled cells in the eye.…”

Variations in the retinal designs of pulmonate snails (Mollusca, Gastropoda): squaring phylogenetic background and ecophysiological needs (I)

“…Of all the gastropods with well-developed cameratype eyes studied, only the opisthobranch Navanax inerrnis possesses an eye with a "bi-lobed" lens and a non-hemispherical retina (Eskin & Harcombe 1977).…”

Opsin-like immunoreactivity in the circadian pacemaker neurons and photoreceptors of the eye of the opisthobranch mollusc Bulla gouldiana

“…The eyes of several opisthobranch molluscs contain a pacemaker that generates a circadian rhythm in the fre quency of spontaneous optic nerve impulses (Jacklet 1969;Eskin and Harcombe 1977;Eskin 1979;Block and Roberts 1981;Block and Wallace 1982). These impulses are large (-100 p.V) compound action potentials that re sult from the simultaneous firing of a population of elec trically coupled retinal cells.…”

Daily and Seasonal Rhythms

“…The rhythm in the isolated eye was discovered by Jacklet (488) in studies on the eye of Aplysia californica . Subsequently, similar rhythms were documented in other species of Aplysia (489, 490), Navanax inermis (288), Bulla gouldiana (103), and Bursatella leachi plei (101). In each of these species, circadian rhythms are expressed in the frequency of large‐amplitude compound action potentials in the optic nerve that arise from a population of electrically coupled cells in the eye.…”

Variations in the retinal designs of pulmonate snails (Mollusca, Gastropoda): squaring phylogenetic background and ecophysiological needs (I)

“…Of all the gastropods with well-developed cameratype eyes studied, only the opisthobranch Navanax inerrnis possesses an eye with a "bi-lobed" lens and a non-hemispherical retina (Eskin & Harcombe 1977).…”

Opsin-like immunoreactivity in the circadian pacemaker neurons and photoreceptors of the eye of the opisthobranch mollusc Bulla gouldiana

“…The eyes of several opisthobranch molluscs contain a pacemaker that generates a circadian rhythm in the fre quency of spontaneous optic nerve impulses (Jacklet 1969;Eskin and Harcombe 1977;Eskin 1979;Block and Roberts 1981;Block and Wallace 1982). These impulses are large (-100 p.V) compound action potentials that re sult from the simultaneous firing of a population of elec trically coupled retinal cells.…”