Swelling properties of dogfish cornea

Tolpin, Daniel W.; Klyce, Stephen D.; Dohlman, Claes H.

doi:10.1016/s0014-4835(69)80009-6

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…Recently a similar structure was discovered also in the primary spectacle of cyclostomes and in aquatic amphibia [Van Horn et al, 1969a, b]. The cornea of Squalus acanthias thickens towards the periphery, the increase in thickness being approxi mately 30% [Tolpin et at., 1969]. Numerous papers describe the morphologic structure of the elasmobranch cornea in great detail using different techniques [Polack, 1961;Smelser, 1962;Payrau et al, 1964Payrau et al, ,1965Kitano, 1966;Kitano and G oldman, 1966;G oldman and Benedek, 1967].…”

Section: Discussionmentioning

confidence: 90%

“…The swelling properties of the dogfish cornea were studied by Tolpin et al [1969], They stated that in the dogfish cornea swelling pressure is zero at its normal hydration, but rises abruptly as the hydration decreases. On the contrary, the mammalian stroma only reaches zero swelling pressure at hy drations much greater than normal.…”

Section: Discussionmentioning

confidence: 99%

“…According to Jacques et at. [1969] salinity is equal to 3.77-3.78%, pH 8.3, and (d) artificial dogfish aqueous humor [Tolpin et al, 1969] All experiments were performed at laboratory temperature. It could not be excluded that pH values measured in freshly prepared solution differed in some way from actual pH values after incubation of tissue.…”

Section: Methodsmentioning

confidence: 99%

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Hydration Properties of the Corneal Stroma in Dogfish Scyliorhinus canicula L

Obenberger¹,

Čejková²,

Bolková³

et al. 1971

Ophthalmic Res

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Corneas of the dogfish (Scyliorhinus canicula L.), with and without epithelium, were excised and immersed in different aqueous solutions, i. e. distilled water, 0.9% solution of NaCl, artificial dogfish aqueous humor, and sea water. Weights of the corneas after a 3-hour, 6.5-hour, and 19-hour immersion, and the final dry weight were compared with the initial weight of the fresh tissue. Not only did no swelling of the examined corneas appear but, even, in nearly all instances marked solubilization of the elasmobranch corneas connected with a decrease of their final dry weight occurred.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Hydration Properties of the Corneal Stroma in Dogfish Scyliorhinus canicula L

Obenberger¹,

Čejková²,

Bolková³

et al. 1971

Ophthalmic Res

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“…The cornea has as a feature the transparency in demanding chemical environments due to its mechanism of deturgescence and organization of collagenous fibers as well as presence of sutures found in the stromal layer (Tolpin et al, 1969). Differently from other vertebrate including the mammals, the corneous endothelium is not part of this transparency mechanism (Hueter).…”

Section: Discussionmentioning

confidence: 99%

Morphological Study of the Eye Bulb of the Hammerhead Shark, Sphyrna lewini (Elasmobranch: Carcharhinidae)

Muriana¹,

Vasconcelos

Leandro

et al. 2017

Int. J. Morphol.

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SUMMARY:The hammerhead sharks shows a head laterally expanded with eyes and nostrils on the edges, which gives the species a hammer appearance. Another strand of studies indicates that the hypothesis of head shape alterations for better adaptions in the sensorial system with the development of structures associated to binocular sight and others sensorial organs. Given the variety of characteristics, the study aim was to describe the anatomical constitution of the hammerhead shark eye bulb. The bulb and its annexes exenteration was performed, and further dissection; the morphological description of the muscle insertions and eye bulb components were based on direct observation and were further photographed and catalogued. The eye bulb fragments and its annexes were histological technical. Between the sclera and the choroid it was possible to observe, by the electronical scanning microscopy, the thin layer called supra-choroid, in this region, spaces often filled by lymphatic vessels allied to a matrix formed by loose conjunctive tissue are found. In the choroid, a layer which is rich in blood vessels, loose conjunctive tissue and collagen fibers, was observed, besides pigmentary cells full of melanin in its interior, which result in its layer's dark color. Ciliary body is a choroid's dilatation; it has the aspect of a thick ring in finger-like shape, pigmented, covering the sclera surface and containing pigmentary cells. The crystalline capsule, which shows an acellular covering that, is hyaline and homogeneous. In the electronical scanning microscopy, it was observed that the capsule is extremely thick especially in the anterior face. The capsule is very elastic, constituted mainly by thin lamellae of collagenous fibers, as illustrated by the electronically scanning microscopy. Anatomic variations related mainly to the position of the eye bulb in the skull, fibrous tunica and lens call the attention and must be related to its habitat.

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Physiological Chemistry of the Eye

Gw¹

1973

Archives of Ophthalmology

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Swelling properties of dogfish cornea

Cited by 9 publications

References 9 publications

Hydration Properties of the Corneal Stroma in Dogfish Scyliorhinus canicula L

Hydration Properties of the Corneal Stroma in Dogfish Scyliorhinus canicula L

Morphological Study of the Eye Bulb of the Hammerhead Shark, Sphyrna lewini (Elasmobranch: Carcharhinidae)

Physiological Chemistry of the Eye

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