1. Part IV: Nervous Tissue
Main component of nervous system
Structure: neuron = dendrite + cell body + axon
Function: regulates and controls body functions
Location in the body: brain, spinal cord, nerves

2. Part IV: Nervous Tissue
2 Major Cell Types:
Neurons
Respond to stimuli
Transmit electrical impulses
Other cells
Support, insulate, protect neurons

4. Tissue Repair Wound healing Two ways:
Regeneration: replace destroyed tissue by same kind of cells
Fibrosis: form scar tissue (dense fibrous connective tissue)
Depends on:
Type of tissue damaged
Severity of injury

5. Steps to Tissue Repair:
Inflammation
Capillaries become very permeable
WBC’s and clotting proteins seep into injured area
Clot prevents loss of blood (surface dries, forms a scab)

6. Steps to Tissue Repair:
Granulation tissue forms
Delicate pink tissue with new capillaries
Connective tissue produces collagen fibers
Epithelial cells multiply over granulation tissue

7. Steps to Tissue Repair:
Surface epithelium regenerates
Surface epithelium thickens
Fibrous tissue matures – forms scar tissue

8. Regenerative Capacity of Different Tissues
Extremely Well
Moderate
Weak
Virtually None
(mostly scar tissue)
Skin epidermis
Mucous membranes
Fibrous connective
Blood
Bones
Smooth muscle
Tendons, ligaments
Skeletal muscle
Cartilage
Cardiac muscle
Nervous tissue