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Cephalopods, as active marine predators, possess sensory organs specialized for use in aquatic conditions. [1] They have a camera-type eye which consists of an iris, a circular lens, vitreous cavity (eye gel), pigment cells, and photoreceptor cells that translate light from the light-sensitive retina into nerve signals which travel along the optic nerve to the brain. [2]
The giant Pacific octopus (Enteroctopus dofleini), also known as the North Pacific giant octopus, ... Close-up of E. dofleini showing one of the eyes, ...
An octopus (pl.: octopuses or octopodes [a]) is a soft-bodied, eight-limbed mollusc of the order Octopoda (/ ɒ k ˈ t ɒ p ə d ə /, ok-TOP-ə-də [3]).The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids.
In octopus eyes, the nerve fibers route behind the retina, and do not block light or disrupt the retina. In the example, 4 denotes the vertebrate blind spot, which is notably absent in the octopus eye. In both images, 1 denotes the retina and 2 the nerve fibers, including the optic nerve (3).
Although color changes appear to rely primarily on vision input, there is evidence that skin cells, specifically chromatophores, can detect light and adjust to light conditions independently of the eyes. [38] The octopus changes skin color and texture during quiet and active sleep cycles. [39]
In octopus eyes, the nerve fibers route behind the retina, and do not block light or disrupt the retina. In the example, 4 denotes the vertebrate blind spot, which is notably absent in the octopus eye. In both images, 1 denotes the retina and 2 the nerve fibers, including the optic nerve (3).
Credit: Marleen Moise/WireImage via Getty Images Katy Perry is mourning the loss of celebrity hairstylist Jesus Guerrero. Perry, 40, a former client of Guerrero’s, shared a heartfelt post via ...
Vitreledonella richardi, also known as the glass octopus, is a transparent, gelatinous, and almost colorless meso-to bathypelagic octopod found worldwide in tropical and subtropical seas. Because this octopus mostly lives in deep ocean waters, there have been very few observations of it in the wild.