Part IV Nervous Tissue Main component of nervous

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Part IV: Nervous Tissue Main component of nervous system Structure: neuron = dendrite +

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

Part IV: Nervous Tissue 2 Major Cell Types: Neurons Respond to stimuli Transmit electrical

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

Tissue Repair Wound healing Two ways: 1. Regeneration: replace destroyed tissue by same kind

Tissue Repair Wound healing Two ways: 1. Regeneration: replace destroyed tissue by same kind of cells 2. Fibrosis: form scar tissue (dense fibrous connective tissue) Depends on: Type of tissue damaged Severity of injury

Steps to Tissue Repair: 1. Inflammation Capillaries become very permeable WBC’s and clotting proteins

Steps to Tissue Repair: 1. Inflammation Capillaries become very permeable WBC’s and clotting proteins seep into injured area Clot prevents loss of blood (surface dries, forms a scab)

Steps to Tissue Repair: 2. Granulation tissue forms Delicate pink tissue with new capillaries

Steps to Tissue Repair: 2. Granulation tissue forms Delicate pink tissue with new capillaries Connective tissue produces collagen fibers Epithelial cells multiply over granulation tissue

Steps to Tissue Repair: 3. Surface epithelium regenerates Surface epithelium thickens Fibrous tissue matures

Steps to Tissue Repair: 3. Surface epithelium regenerates Surface epithelium thickens Fibrous tissue matures – forms scar tissue

Regenerative Capacity of Different Tissues Extremely Well Moderate • Skin epidermis • Smooth •

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