skin (integument)
DESCRIPTION
Skin (Integument). Figure 5.3. Epidermis. Layers of the Epidermis: STRATA = LAYERS. C G S B D. C G S B D. Epidermis. Tissues. Groups of cells similar in structure and function The four types of tissues Epithelial Connective Muscle Nerve. EPITHELIAL TISSUE. - PowerPoint PPT PresentationTRANSCRIPT
Skin (Integument)
Figure 5.3Epidermis
Layers of the Epidermis: STRATA = LAYERS
Epidermis
C
G
S
B
D
C
G
S
B
D
Tissues
• Groups of cells similar in structure and function
• The four types of tissues–Epithelial
–Connective
–Muscle
–Nerve
EPITHELIAL TISSUE
Epithelial Tissue
–covers the body surfaces
–lines the lumen of organs
–lines the body cavities
–forms glands and lines ducts
Epithelial Tissue - characteristics• Cellularity –• Special contacts – tight / desmosomes• Polarity – apical / basal• Supported by connective tissue – lamina• Avascular but innervated – • Regenerative –
Classification of Epithelia
• Simple or stratified
Figure 4.1a
apical
basal
Classification of Epithelia• Squamous, cuboidal,
or columnar
• DESCRIPTION
Figure 4.1b
Simple Squamous
Figure 4.2a
DESCRIPTION
FUNCTIONS
PRESENCE- glomeruli, alveoli, etc.
Alv Org
Lung XS
Alv Org
AL
Type II cell
C
Squamous
(bar = 1um)
Lumen of alveolusSimple squamous of alveolusSimple squamous of capillary
Lumen of alveolus
Respiratory membrane
Capillary Simple squamous epithelium
Capillary wall is Simple squamous epithelium
Kidney (Glomerulus) Simple squamous epithelium (arrow) lines the glomerulus. Bar = 50um
NEPHRON TUBULE CONTAINS THE GLOMERULUS
Epithelia: Simple Cuboidal
Figure 4.2b
• DESCRIPTION• FUNCTIONS• PRESENCE-
Beginning of nephron tubule
Longitudinal section of nephron tubules
Cross section of nephron tubules
2,000L 180L
1.5L
FILTER RESORB SECRETE
EXCRETE
Epithelia: Simple Columnar
Figure 4.2c
DESCRIPTION
FUNCTIONS
PRESENCE
Gall BladderSimple columnar epithelium lines the gall bladder. Note the underlying connective tissue with blood vessels.
Bar = 100 Microns
Gall BladderSimple columnar epithelium lines the gall bladder. Note the underlying connective tissue with blood vessels.
Bar = 100 Microns.
Goblet cell
... ... with microvilli (brush border)with microvilli (brush border)
ciliacilia
... ... with ciliawith cilia
Figure 4.2d
DESCRIPTION
FUNCTIONS
PRESENCE
Trachea The pseudostratified columnar epithelium of the trachea is ciliated and has goblet cells.
Bar = 50 um
Pseudostratified columnar epithelium Pseudostratified columnar epithelium with cilia and goblet cellswith cilia and goblet cells
Trachea Pseudostratified columnar epithelium