The pecten is believed to both nourish the retin In this species the pecten consists of 12 highly vascularised pleats, held together apically by a heavily pigmented 'bridge' and projects freely into the vitreous body in the ventral part of the eye cup. 1967 May;120(3):427-61. if yes then how? In this study was investigated the structure of pecten oculi in the ostrich, duck, pigeon, turkey, and starling. In addition to the two eyelids usually found in vertebrates, it is protected by a third transparent movable membrane. Hey friend, Am I right if you are asking about pecten? We took him to vet. Some bird groups have specific modifications to their visual system linked to their way of life. This structure is claimed to perform a number of functions in the life of pigeon. Am J Anat. We investigated at different developmental stages the antigen recognition and presentation capacity of pecteneal hyalocytes that adhere to the pecten oculi in the eye of domestic chickens. Introduction The pecten oculi is a unique anatomical structure of the avian eye. he told to give oxytetracyclin. "1 Histologically, all the retinal layers found in man are present in the pigeon, but the retina is 1}^ to 2 times thicker than in man because of the thickness of the inner The functions are: (1) As the pecten is an erectile structure, it is possible that irregular shad­ows cast by this organ provide many blind spots on the retina. ? We have given only one dose of the drug by dissolving in water. Raviola E, Raviola G. PMID: 4166773 but the condition seems to be very chronic. complete puss around eyes. Nat New Biol. It is a non-sensory, pigmented structure that projects into the vitreous humor from the point where the optic nerve enters the eyeball. 26.46) is a pleated, strongly pigmented vascular fold projecting into the cavity of the eye from the entrance of the optic nerve. what should we do more???? I have found a pigeon who had puss kind of formation around both eyes and beak. A light and electron microscopic study of the pecten of the pigeon eye ... A similar material is found on the outer surface of the basal lamellae and imperceptibly merges with the ground substance of an unusually thick adventitial layer that is permeated by numerous unit fibrils of collagen. The development and histochemical study on the pecten … The pecten or pecten oculi is a comb-like structure of blood vessels belonging to the choroid in the eye of a bird. Pecten (Fig. On the micrograph above, the very folded nature of the pleats is clearly visible. Barlow HB, Ostwald TJ. The pecten oculi is found in the vitreous chamber of the eye of all avians (Rochon- Duvigneaud 1943) and it is considered an indirect retinal trophic system (Michaelson1954, Puzzolo 1994), more effectively functioning during saccadic oscillations (Pettigrew et al 1990). In recent years, the ablation experiments of Wingstrand and Munk (1965) have been taken by most hypothesis that the pecten, which is the only vascular structure within the posterior cham-ber of the avian eye, serves as a replacement for the direct vascularization of the retina found in most other vertebrates. Though there are the several components which work all together to have the functional eyes in birds, but a comb like distinctive structure of pecten oculi specifically found in avian eye. It is large and much pleated in predatory birds, which detect minute movements at great distances, and is small and smooth in nocturnal birds. CHAPTER 7 The Structural Organization of the Pigeon Retina B. P. HAYES Department of Visual Science, Institute of Ophthalmology, Judd Street, London, WC1H 9QS CONTENTS . Introduction The pecten oculi is a unique anatomical structure of the avian eye. can we clean his eyes?? A light and electron microscopic study of the pecten of the pigeon eye. Functional morphology of the pecten oculi in the nocturnal spotted eagle owl (Bubo bubo africanus), and the diurnal black kite (Milvus migrans) and domestic fowl (Gallus gallus var.