Tissues

1
Tissues

• Definition?
• Histology- study of tissues within the body
  systems
• Classified based on
• Embryonic development
• Intercellular space
• Four Tissue Types

2
EPITHELIAL TISSUE

• Very Little intercellular space material
• Derived from all three embryonic layers
• Regeneration??
• Arranged in sheets with a basement membrane
• Exposed surface (internal or external)
• Function
• Protection
• Cover internal and external surfaces
• Secretion and absorbtion (Glands)
• Classified by shape of cells and number of layers

3
EPITHELIAL TISSUE

• SIMPLE SQUAMOUS
• Single layer
• Squamous shape
• Lining of body cavity, lungs, blood vessels

4
EPITHELIAL TISSUE

• SIMPLE CUBOIDAL
• Single layer
• Cuboidal shaped
• Kidney tubules, glands

5
EPITHELIAL TISSUE

• SIMPLE COLUMNAR
• Single layer
• Columnar shape
• Lining of digestive tract
• Modified by presence of cilia

6
EPITHELIAL TISSUE

• STRATIFIED SQUAMOUS
• Multi layer
• Outer most layer- squamous cells
• Inner- cuboidal or columnar
• Lining of mouth, esophagus, skin

7
EPITHELIAL TISSUE

• PSEUDOSTRATIFIED COLUMNAR
• One layer
• Appears stratified
• Respiratory tract

8
Glands

• One cell or a group of specialized epithelial
  cells to secrete substances into ducts, the
  surfaces or blood
• Exocrine
• Example- sweat or salivary glands
• Endocrine
• Example- hormones

9
CONNECTIVE TISSUE

• Abundant extracellular material
• Derived from the mesoderm
• Matrix (dominant part)
• Fiber, cells in liquid, gel, or solid matrix
• Highly vascular
• Function
• Bind and/or support other tissue
• Store nutrients

10
CONNECTIVE TISSUE

• Tendons
• Dense fiberous
• Abundant, well organized fiber

11
CONNECTIVE TISSUE

• ADIPOSE TISSUE
• Loose connective
• Semisolid matrix
• Store large droplets of fat
• BLOOD
• Lymph
• Liquid, fluid matrix
• Sometimes in different category
• RBC- Red Blood Cells
• WBC- White Blood Cells

12
CONNECTIVE TISSUE

• CARTILAGE
• Chondrocytes
• Small cavities- lacunae
• Dense, solid elastic matrix
• Ear, nose

13
CONNECTIVE TISSUE

• BONE
• Osteocytes
• Solid, rigid matrix
• Hardest CT
• Impregnated w/ calcium salts

14
MUSCLE TISSUE

• Derived from mesoderm
• Little intercellular matrix, fibers close
  together
• Cells have ability to contract
• Function
• Locomotion
• Other body movement
• Pg 156-157,162 slides 161

15
MUSCLE TISSUE

• SKELETAL
• Voluntary movement
• Typically attach to bone
• Long and cylindrical
• Transverse striation
• Each fiber is multi-nuclear

16
MUSCLE TISSUE

• SMOOTH
• Involuntary movement
• Nonstriated
• Predominant
• Long, spindle shape
• Single nucleus
• Internal organs

17
MUSCLE TISSUE

• CARDIAC
• Striations
• Involuntary
• One nucleus
• Deep center
• Heart muscle

18
NERVE TISSUE

• Derived from ectoderm
• Little intercellular matrix
• Cells very high ability to
• Respond to stimuli
• Transmit impulses
• Two types
• Neurons and Neuroglia

19
NERVE TISSUE

• NEURON
• Cell Body(3)
• Dendrites (5)
• Axon(1)

20
List of intercellular matrix

• Least to most
• Epithelial
• Muscular
• Nervous
• connective