Three‐dimensional reconstruction of the angioarchitecture of the ciliary body of the West Indian manatee (<i>Trichechus manatus</i>)

Natiello, Michelle; Samuelson, Don

doi:10.1111/j.1463-5224.2005.00406.x

Cited by 7 publications

(4 citation statements)

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“…Increased numbers and prominence of iridal and ciliary body blood vessels have also been found in other aquatic mammals such as the beluga, narwhal and fin whale 36 . Previously, the ciliary body musculature was thought to be the only means of accommodation in mammals, but the lack of ciliary body musculature is now considered as a likely adaptation to aquatic life 38 . The ability to increase aqueous outflow via both the intrascleral vessels and ciliary body vessels as identified in the manatee and pilot whale, and as appears to be the situation in Leatherbacks, has been surmised to facilitate changes in the IOP by allowing more control over the production of aqueous humor.…”

Section: Discussionmentioning

confidence: 98%

Ocular morphology of the Leatherback sea turtle (Dermochelys coriacea)

Brudenall¹,

Schwab

Fritsches

2008

Veterinary Ophthalmology

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Section: Discussionmentioning

confidence: 98%

Ocular morphology of the Leatherback sea turtle (Dermochelys coriacea)

Brudenall¹,

Schwab

Fritsches

2008

Veterinary Ophthalmology

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“…Southern right whale, pilot dolphin, and the manatees also share the lack of ciliary body musculature and increased vasculature in the ciliary processes. The increase in vascular supply has been linked with the development of an alternative mechanism of lens accommodation to compensate the absence of ciliary musculature (Hatfield et al, 2003; Natiello and Samuelson, 2005).…”

Section: Discussionmentioning

confidence: 99%

Morphology of the Eye of the Southern Right Whales (Eubalaena australis)

Buono

Fernández

Herrera

2011

The Anatomical Record

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Recently, there has been a growing interest in the anatomy and optics of the visual system of cetaceans. However, much of the new information has been focused on odontocetes, and relatively little is known about the visual anatomy of baleen whales. The aim of this study was describe the eye anatomy of the southern right whale (Eubalaena australis). Eye samples were collected from 26 calves, four adults with known body length, as well as two specimens of unknown body length that had stranded near their nursery ground at Península Vald es, Argentina, over 6 years. We provide anatomical descriptions of the eyeball and extraocular structures, as well as quantitative data in the form of eyeball, corneal, scleral, and lens measurements. To explore the sensitivity of the eye to light, the f-number was estimated in one specimen. We found that the eyes of the calves differed from those of the adults in having less periorbital fat surrounding the eyeball. We also observed variations in the abundance of periorbital fat among the adult specimens. The regression analysis revealed a correlation between body length and eyeball size. By contrast, the dimensions of the cornea were only weakly correlated with body length. The estimated f-number suggests that the optical sensitivity of the Eubalaena australis eye is relatively low. However, caution had to be taken in interpreting f-number as a proxy of eye sensitivity because it depends on the lens size, which can be affected by the fixation methods used. Anat Rec,

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“…Sections made were 6 microns thick and stained most often with Masson's trichrome. The Masson's trichrome stain was favored because it aided in the visualization of the blood vessels and in three‐dimensional reconstructions, which is described separately 10 . Other stains used included hematoxylin and eosin (H&E), and periodic acid‐Schiff (PAS) 11,12…”

Section: Methodsmentioning

confidence: 99%