Sinu-Atrial Node of Mature Dromedary Camel Heart (Camelus dromedarius) with Special Emphasis on the Atrial Purkinje Like Cardiomyocytes
Wael Ghonimi,
Ahmad Balah,
Mohamed Hafez Bareedy,
Hoda Fa Salem,
Shehata Mm Soliman,
Ahmad Elbaz,
Amr Helal,
Ahmad Awad Abuel-Atta
Issue:
Volume 3, Issue 2, March 2015
Pages:
25-33
Received:
28 February 2015
Accepted:
5 May 2015
Published:
13 May 2015
Abstract: The sinu-atrial node (SAN) is one of the impulse conducting system of the camel heart. Anatomically, it lies beneath the epicardium, at the cranial end of the terminal sulcus, near the junction between the superior vena cava to the lateral wall of the right atrium and the right auricle. Histologically, SAN is located in the subepicardial layer of the terminal crest and can be identified as a mass of specialized and modified cardiac myocytes. Moreover, it appeared elongated in shape and bent oblong. SAN appears strongly similar to the general structure of the glands where, it is formed of two parts; the stroma and the parenchyma. The stroma is consisted of a fibrous connective tissue capsule that is completely investing the SAN from all sides. From the capsule, thin connective tissue septa or trabeculae are extending to inside the node, dividing the later into lobes. These lobes form the SAN head or the SAN body. From this body, the SAN arms processes take their way out. These arms are considered the internodal and interatrial pathways to the different sites in the right and left atria. So, the SAN head with arms giving the octopus like-appearance for the node. The parenchyma is consisted of three different types of specialized and modified cardiac myocytes; the perinuclear clear zone cells (“P” cells), the transitional cells (“T” cells) and the atrial Purkinje like cells or Purkinje like conducting cells.
Abstract: The sinu-atrial node (SAN) is one of the impulse conducting system of the camel heart. Anatomically, it lies beneath the epicardium, at the cranial end of the terminal sulcus, near the junction between the superior vena cava to the lateral wall of the right atrium and the right auricle. Histologically, SAN is located in the subepicardial layer of t...
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Most Beautiful Pigeons of Bangladesh
Issue:
Volume 3, Issue 2, March 2015
Pages:
34-37
Received:
19 November 2014
Accepted:
17 December 2014
Published:
16 May 2015
Abstract: Pigeons are not aristocratic bird but its body shape, colorful feathers, ornamentation, care, mode of breeding; availability and cost seem to be aristocratic. From the very beginning of human welfare there existed a good relation between pigeon and human. At the dawn of human civilization pigeons are used as letter sending. Later on its tumbling is another great point for its peculiar life. These birds are more social, lovely and sophisticated and found most of the houses in rural and urban areas. Observed seven very nice pigeons are- western crowned pigeon, fantail, jacobin, frillback, pouter, trumpeter and swallow. Their breeding is not normal as local pigeon except fantail. Though the western crowned pigeon is wild but in captivity its breeding and maintenance is not bad. Though these pigeons are produced fewer squab but only 1-2 pair in a year is shown great economic value. Mentioned pigeons are chosen by peoples only on ornamental feathers except the enlarge crop of the pouter. Observed some pigeons are reared in aristocratic family of the famous people or for research affairs so that it can be easily considered as aristocratic ones. Jacobin pigeon was the best to queen Victoria. In America, trumpeter is one of the most popular breed to all. Moreover, emperor Akbar reared fantail and pouter pigeons with other pigeons and naturalist Charles Darwin established a pigeon farm in his yard for explain his book ‘variation of plants and animals under domestication’. From the history the frillback is called Darwin pigeon. Pablo Picasso and Gypsy Rose Lee like fantail pigeon and Johnny Otis is famous for swallow pigeon collection. Out of seven breeds only crown pigeon and frillback evolved by natural selection and others from artificial selection by judicious breeding. Except fantails other six pigeons need to foster pigeons for its squab rising.
Abstract: Pigeons are not aristocratic bird but its body shape, colorful feathers, ornamentation, care, mode of breeding; availability and cost seem to be aristocratic. From the very beginning of human welfare there existed a good relation between pigeon and human. At the dawn of human civilization pigeons are used as letter sending. Later on its tumbling i...
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