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In gewervelde ogen, de zenuwvezels route voor de retina, blokkeert wat licht en er een blinde vlek waar de vezels doorheen het netvlies. They are highly mobile and spaced widely to allow the animal to see behind itself for danger. Introduction to: Cephalopod Vision By Dr. James Wood and Kelsie Jackson An Introduction to Vision in Cephalopods (Figure 1: Four parallel light beams traveling from right to left are focused by a cephalopod eye. Unlike the vertebrate camera eye, the cephalopods' form as invaginations of the body surface (rather than outgrowths of the brain), and consequently they lack a cornea. Van Wikipedia, de gratis encyclopedie. WikiProject Animal anatomy (Rated C-class, High-importance) This article is part of WikiProject Animal anatomy, an attempt to organise a detailed guide to all topics related to animal anatomy apart from human anatomy. Unlike the vertebrate eye, a cephalopod eye is focused through movement, much like the lens of a camera or telescope, rather than changing shape as the lens in the human eye does. Apposition eyes are the most common form of eye, and are presumably the ancestral form of compound eye.They are found in all arthropod groups, although they may have evolved more than once within this phylum. gewerveld. The point where the light beams intersect on the left is … The eyes are located just above and behind the tentacles. Some annelids and bivalves also have apposition eyes. The eye of a cephalopod is strikingly large for the size of the animal, and in the case of the giant squid represents the largest eye in the animal world, nearly the size of a dinner plate. Octopus. Talk:Cephalopod eye. Cephalopod eye - Cephalopod eye. Language; Watch; Edit; Active discussions. In this video, I am giving you guys a basic overview of the cephalopod eyes and show you all the basic anatomy of the coleoid eyes (octopus, squid, cuttlefish). Notably, the both have lenses to refract light, a pupil to restrict incoming light, a retinal surface distributed along the back of the eye, and a well-differentiated optic nerve. First, let's take a look at the anatomy of the octopus eye, in comparison to a more familiar specimen (this figure is from Ogura et al., 2004): They look pretty similar, don't they?

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