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الوصف التشكليائي والتركيب النسجي للبنكرياس المعثكلة في الخفاش الكحلي (Kuhl, 1817) Pipistrellus kuhlii == Morphological Description and Histological Structure of the Pancreas in Al - Kuhlii Bat Pipistrellus kuhlii (Kuhl, 1817)
Author name:
خالدة محمد عليوي العوادي
Supervisor name:
بيداء حسين مطلك
General topic:
Biology
Specific topic:
Zoology - Histology
Degree:
Master
University:
University of Baghdad - Ibn Al-Haytham College Of Education For Pure Sciences - Department Of Biology
Language:
Arabic
University location:
Baghdad
First pages:
24T3243 - p.pdf
Abstract:
The present study was designed to investigate the morphological description and histological structure of the pancreas gland in Bat Pipistrellus kuhlii.A total number of (20) ,10 male and 10 female bats were used in this study after taking out the pancreas gland it was fixed with fixative solutions their the sequent steps of preparing histological slides were done after that they were stained by using routine and special stains. These stains were represented by (Heamtoxylin - Eosin, Periodic acid Schiff, Chrom alum heamtoxylin, Modified aldehyde Fuchsin and Masson’s trichrome).The morphological study showed that the pancreas gland in Kuhli's bat is represented by a compact type of pancreatic tissue it is white to yellowish color divided into three divisions head, body and tail. The pancreatic tissue lies in the abdominal cavity near the mass of intestine at the mesentery network which is connected with the coiled region of the duodenum from one side and the extended mesenteries between the dorsal part of stomach and the ventral part of spleen from the other side. The pancreas gland has only one duct that originated from the pancreatic body which is opened in the upper part of the duodenum.The pancreas gland is surrounded by loose connective tissue it extend trabeculae that divides the gland into many lobules that differs in size and shape. The pancreatic tissue is characterized into two portions, the exocrine portion and endocrine portion, the exocrine portion is represented by a compound tubule - acinar gland which consists of a large number of acini and the ductal system, each acini represented by a serous secretory unit which consists of many pyramidal cells that surround a small lumen,the apics of narrow cells are headed towards the acinar lumen while their bases are wide and based on the basement membrane. The acinar sizes are variable some acini are large others are small. The acinr cells number range from (6 to 9) cells. The ductal system which eliminate the products of secretory units to the duodenum it is initiate with centroacinar cells, these cells are connected with intercalary ducts which connected with intralobular duct, these ducts lead to the interlobular duct, which their diameter is larger than the diameter of intralobular ducts. The inter lobular ducts eliminate their secretory contents in the main duct which opened in the upper part of the duodenum.The endocrine portion is represented by clusters of cells known as islets of Langerhans which appeared as masses of cells diffused among the exocrine portion units, they're separated from each other by a thin layer of connective tissue.The islets are randomly distributed within the pancreatic tissue, it is obvious that these islets are massively concentrated in the body part of pancreas inside the lobules and around the ducts as in the pancreas head. The study also revealed that there were difference in the diameters and numbers of the islets, the mean diameters of the islets was reached (1.86) micrometer with range (1 - 2.75) micrometer whereas the mean number of islets was (1.6) islet per millimeter with rang of (1 - 3) islet.Each islet consists of three types of cells arranged as irregular clusters, they are separated from each other with blood capillary network. They were differentiated by using routine and special stains, these cells are Alpha cells they have rounded shape with oval nucleus they lies at the peripheral part of the islet. Beta cells they’re oval shaped with spherical nucleus they lies at the center of the islet, while delta cells are irregular shaped, with pale color lies between Alpha and Beta cells they’re less in number and they may appear as single cell or as small clusters and mostly lies at the peripheral part of the islet.The islet stained with faint blue in routine stains (Heamtoxylin and Eosin), and they were stained with faint blue when using special stains (Chrome alum phloxine) while the nucleus of Alpha cells stained with dark red and the Beta cells nucleus stained blue whereas Delta cells nucleus appeared in pink to pale red color. When using modified aldehyde Fuchsin the islets stained with greenish blue, alpha cells stained with orang, beta cells were blueish green and delta cells stained with green
