The pecten helps to solve this problem, lifting the blood vessels away from the retina and leading to the extremely sharp eyesight of birds such as hawks. pecten synonyms, pecten pronunciation, pecten translation, English dictionary definition of pecten. Pecten shells or scallops are among the most popular group of molluscs for seashell collectors because of their wide variety of forms and colors. It is a non-sensory, pigmented structure that projects into the vitreous body from the point where the optic nerve enters the eyeball. It is present in all birds and some reptiles. The genus Pecten comprises dozens of species and has been divided into several smaller genera in recent years. 2. In the eye of the bird a comb like structure is present. It is a non-sensory, pigmented structure that projects into the vitreous body from the point where the optic nerve enters the eyeball. They may encounter angels in the form of birds, see images of a beloved bird that has died and believe it is acting as a spirit guide, or glimpse bird images, or animal tokens, symbolizing something God wants to communicate. It is a non-sensory, pigmented structure that projects into the vitreous humor from the point where the optic nerve enters the eyeball. People sometimes see birds appear before them to deliver spiritual messages. The pecten or pecten oculi is a comb-like structure of blood vessels belonging to the choroid in the eye of a bird. Pecten are able to “leap” by forcibly ejecting a stream of water from the shell. Morphological and Histological Description of the Pecten Oculi in the Sparrow Hawk (Accipiter nisus). [4] It is present in all birds and some reptiles. The pecten or pecten oculi is a comb-like structure of blood vessels belonging to the choroid in the eye of a bird. A light and electron microscopic study of the pecten of the ... a moderate number of coated vesicles and of coated and uncoated inpocketings of the plasmalemma is present in the endothelial cells. Examples include the oxygenating structure in the eye of a bird, and the organ used by some insects for STRIDULATION . [3] In the vertebrate eye, blood vessels lie in front of the retina, partially obscuring the image. The pecten is believed to both nourish the retin In this work, we provide morphological and morphometric data on the pecten oculi of this bird to demonstrate its struc-tural and ultrastructural organization and to present The pecten helps to solve this problem by greatly reducing the number of blood vessels in the retina and leading to the extremely sharp eyesight of birds such as hawks. It is a rectangular plate. The pecten oculi of the quail was studied by scanning electron microscopy. (b) The vessels which eventually become the veins of the pecten are developmentally the oldest, the artery being a secondary modification of a cilioretinal vessel, (c) A homologue of the hyaloid vessel of mammals is present in birds. In the vertebrate eye, blood vessels lie in front of the retina, partially obscuring the image. There are nearly 500 different recent species known, divided in 4 families. The pecten is believed to both nourish the retina and control the pH of the vitreous body. It is soft and vascular. Although functional morphology of the pecten oculi correlates with the life-style of the bird [15], histologic findings obtained from this study and previous study [2, 5, 8] in various bird species demonstrated that pecten oculi is basically composed of numerous capillaries, large …