Histology (Skin) - Part 2
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Histology (Skin) - Part 2

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Histology (Skin) - Part 2 Histology (Skin) - Part 2 Presentation Transcript

  • (sweat glands(eccrine Myoepithelial cell Sweat duct Sweat gland Secretory cell
  • ECCRINE AND APOCRINE GANDS
  • Skin Glands
  • Structures of skin: hair follicle  Invagination of epidermis  Hair contains keratin and melanin  Dermal papilla  Connective tissue invagination into bulb, has capillary network  Matrix  Germinative layer adjacent to dermal papilla  Also contains melanocytes  Sebaceous gland  Secretion empties into hair follicle(dermal papilla)  Arrector pili muscle bulb  Smooth muscle, inserts on hair follicle and base of epidermis
  • THE HAIR
  • The hair is formed of Shaft: medulla, cortex and cuticle The hair follicle is formed of : Inner root sheath formed of: Cuticle ,Huxleys layer,Henles layer Outer root sheath: identical with Malpighian Layer of epidermis Connective tissue sheath
  • Structures of skin: hairfollicle Arrector pili muscle Sebaceous gland Dermal papilla
  • Thick skin vs thin skin Thick skin  Palms and soles  Thicker epidermis  Hairless ,more sweat  glands Thin skin  Everywhere else  Thinner epidermis  Hair, sebaceous  And sweat glands
  • FINGER PRINTS
  • THE PANCREAS
  • The Pancreas
  • Exocrine part Stroma : thin C.T capsule &trabeculae. Parencaima : pancreatic acini ,lined with Pyramidal cells with apical acidophilic zymogen granules and basal basophilic striation. Secrete digestive enzymes via duct system starting by intercalated ducts.
  • Pancreatic acinus
  • PancreasIntercalated ducts&Centroacinar cells
  • Endocrine Pancreas
  • ISLETS OF LANGERHANS Non capsolated anastomosing cords of cells separated by blood sinusoids Alpha-cells 15-20um, prepheral Secrete glucacone 20 % stain pink with Gomori Beta –cells 10-15um, central in position 60-75%, Stain blue with Gomori stain Secrete insulin
  •  Delta cells 2% Secrete somatostatine which supresses A,B cells and growth hormone secretion PP cells 2% secrete pancreatic polypeptide which is involved in protein and carbohydrate metabolism. Ganglion cells Involved in nervous control of islet functions.
  • http://www.lab.anhb.uwa.edu.au/mb140/CorePages/Liver/Images/pan20he.jpg
  • Islets- glucagon
  • Islet- insulin
  • Islet-somatostatin
  • Cells of islets of langerhansβ Immunohistoch emical stain δα
  • Islet of langerhans
  • Pancreas
  • Pancreas
  • Quiz? ? DO YOU KNOW
  • 2. Where are the stem cells of theepidermis located? A. B. C. D. E.
  • 2. What is the name of the layerslabeled (A) &(B) and (C)? A. B. C. D. E.
  • The structure at the .3:pointer  A. is involved in touch sensation  B. contains unmyelinated nerve endings  C. both A and B  D. is involved in vibratory sensation  E. none of the above
  • Thank you