sweat glands(eccrine)
Sweat gland
Myoepithelial cell
Sweat duct
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 Arrector pili muscle
Smooth muscle, inserts on hair follicle and base of epidermisbulb
(dermal papilla)
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: hair follicle
Dermal papilla
Arrector pili muscle
Sebaceous gland
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 langerhans
Immunohistochemical stain
β
δ
α
Islet of langerhans
Pancreas
Pancreas
DO YOU KNOW? ? Quiz
2. Where are the stem cells of the epidermis located?
A.
B.
C.
D.
E.
2. What is the name of the layers labeled (A) &(B) and (C)?
A.
B.
C.
D.
E.
3 .The structure at the 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 youThank you