Tissues of the Body Notes (pt2) (Anat and Phys)

Nervous Tissue

Carries electrical signals to the brain or spinal cord. Consists of neurons and supporting cells

Afferent Sensory Neurons

Carries sensory message TOWARD brain/spinal cord

Efferent Motor Neurons

Carries motor (movement) message AWAY from brain/spinal cord

Interneurons

Connects afferent and efferent neurons

Neuron

Nerve cell

Muscle Tissue

Contracts and produces movement

Skeletal Muscle

Voluntary, striated (striped), organized, multinucleate cells

Cardiac Muscle

Involuntary, striated (striped), intercalated disk cells

Smooth Muscle

Involuntary, mix of striated and not striated (chaotic), disorganized cells with a control nuclei

Inflammation

First line of defense by our bodies if our tissues are invaded.

Characteristics:

- Dilation of blood vessels

- Increasing blood vessel permeability

- Redness, swelling, heat, pain

Regeneration

Tissue Repair. Replaces destroyed tissue with new tissue

Fibrosis

Tissue Repair. Growth of fibrous connective tissue (scar tissue)

Steps to restoring tissues

1. Inflammation

2. Restores blood; blood clot replaced by granulation (delicate pink tissue)

3. Regeneration

In pure ... healing goes completely through ... no clots or scarring

infections, regeneration

If the wound is small and tissue is actively dividing, then new tissue covers over the granulation tissue, thus there is...

Little to no scarring

If the wound is large or the tissue is amitotic (less cell division ongoing), then fibrous tissue remains and hardens. this tissue is now called...

scar tissue

Ectoderm

Nervous Tissue

Mesoderm

Muscle and connective tissue

Endoderm

Mucosae

Strong Regeneration

epithelial, bone, areolar connective, dense irregular connective, blood-forming (Happy)

Moderate Regeneration

Smooth muscle and dense regular connective tissue (Neutral)

Weak Regeneration

skeletal muscle and cartilage (Sad)

No Regeneration

cardiac muscle and nervous tissue (Angry)