Morphological Study of the Iris Musculature in Diurnal and Nocturnal Raptors

In literature it is established that the iris musculature consists of striate muscle fibers in birds while in mammals it consists of smooth muscles. Some authors report the presence of smooth muscle tissue also in the iris of some species of birds. In the present study we report on the iris muscle t...

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Autores principales:	Coli,Alessandra, Stornelli,Maria Rita, Barsotti,Giovanni, Ceccherelli,Renato, Giani,Eleonora, Lenzi,Carla, Giannessi,Elisabetta
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2016
Materias:	Iris Striated musculature Smooth musculature Morphology Raptors
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200016
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spelling	oai:scielo:S0717-950220160002000162016-07-13Morphological Study of the Iris Musculature in Diurnal and Nocturnal RaptorsColi,AlessandraStornelli,Maria RitaBarsotti,GiovanniCeccherelli,RenatoGiani,EleonoraLenzi,CarlaGiannessi,Elisabetta Iris Striated musculature Smooth musculature Morphology Raptors In literature it is established that the iris musculature consists of striate muscle fibers in birds while in mammals it consists of smooth muscles. Some authors report the presence of smooth muscle tissue also in the iris of some species of birds. In the present study we report on the iris muscle tissues (type of tissue, direction and mean diameter of muscle fibers or cells) in five species of Accipitriformes (diurnal raptors) and four species of Strigiformes (nocturnal raptors) because they show different way of life depending of their predatory behavior. This morphological study was carried out from raptors died or euthanized at the Wild Life Rescue Centre of Sea and Water birds in Livorno (Italy). From histological examination of iris serial radial sections we find both striated and smooth musculature even if with marked differences among analyzed species, not directly correlated with diurnal or nocturnal lifestyle. Striated fibers are always present, mainly with cross direction, throughout the iris stroma, while the histological differences concern the smooth cells. Indeed, harrier and sparrow hawk (Accipitriformes) and great horned owl and little owl (Strigiformes) show a compact layer of cross smooth muscle cells throughout the iris stroma. In the other species analyzed smooth muscle cells are slightly detectable as scattered or not detectable. Since the cross smooth muscle tissue allows to maintain a myotic state for extended periods of time, our results might be correlated more to the predatory behavior than the taxonomic order.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.34 n.2 20162016-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200016en10.4067/S0717-95022016000200016
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Iris Striated musculature Smooth musculature Morphology Raptors
spellingShingle	Iris Striated musculature Smooth musculature Morphology Raptors Coli,Alessandra Stornelli,Maria Rita Barsotti,Giovanni Ceccherelli,Renato Giani,Eleonora Lenzi,Carla Giannessi,Elisabetta Morphological Study of the Iris Musculature in Diurnal and Nocturnal Raptors
description	In literature it is established that the iris musculature consists of striate muscle fibers in birds while in mammals it consists of smooth muscles. Some authors report the presence of smooth muscle tissue also in the iris of some species of birds. In the present study we report on the iris muscle tissues (type of tissue, direction and mean diameter of muscle fibers or cells) in five species of Accipitriformes (diurnal raptors) and four species of Strigiformes (nocturnal raptors) because they show different way of life depending of their predatory behavior. This morphological study was carried out from raptors died or euthanized at the Wild Life Rescue Centre of Sea and Water birds in Livorno (Italy). From histological examination of iris serial radial sections we find both striated and smooth musculature even if with marked differences among analyzed species, not directly correlated with diurnal or nocturnal lifestyle. Striated fibers are always present, mainly with cross direction, throughout the iris stroma, while the histological differences concern the smooth cells. Indeed, harrier and sparrow hawk (Accipitriformes) and great horned owl and little owl (Strigiformes) show a compact layer of cross smooth muscle cells throughout the iris stroma. In the other species analyzed smooth muscle cells are slightly detectable as scattered or not detectable. Since the cross smooth muscle tissue allows to maintain a myotic state for extended periods of time, our results might be correlated more to the predatory behavior than the taxonomic order.
author	Coli,Alessandra Stornelli,Maria Rita Barsotti,Giovanni Ceccherelli,Renato Giani,Eleonora Lenzi,Carla Giannessi,Elisabetta
author_facet	Coli,Alessandra Stornelli,Maria Rita Barsotti,Giovanni Ceccherelli,Renato Giani,Eleonora Lenzi,Carla Giannessi,Elisabetta
author_sort	Coli,Alessandra
title	Morphological Study of the Iris Musculature in Diurnal and Nocturnal Raptors
title_short	Morphological Study of the Iris Musculature in Diurnal and Nocturnal Raptors
title_full	Morphological Study of the Iris Musculature in Diurnal and Nocturnal Raptors
title_fullStr	Morphological Study of the Iris Musculature in Diurnal and Nocturnal Raptors
title_full_unstemmed	Morphological Study of the Iris Musculature in Diurnal and Nocturnal Raptors
title_sort	morphological study of the iris musculature in diurnal and nocturnal raptors
publisher	Sociedad Chilena de Anatomía
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200016
work_keys_str_mv	AT colialessandra morphologicalstudyoftheirismusculatureindiurnalandnocturnalraptors AT stornellimariarita morphologicalstudyoftheirismusculatureindiurnalandnocturnalraptors AT barsottigiovanni morphologicalstudyoftheirismusculatureindiurnalandnocturnalraptors AT ceccherellirenato morphologicalstudyoftheirismusculatureindiurnalandnocturnalraptors AT gianieleonora morphologicalstudyoftheirismusculatureindiurnalandnocturnalraptors AT lenzicarla morphologicalstudyoftheirismusculatureindiurnalandnocturnalraptors AT giannessielisabetta morphologicalstudyoftheirismusculatureindiurnalandnocturnalraptors
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Morphological Study of the Iris Musculature in Diurnal and Nocturnal Raptors

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