Comprehensive Guide to Major Tissue Types, Skin Layers, and Accessory Structures

Overview: Covers surfaces, lines organs/cavities, and forms glands.
Functions: Protection, absorption, secretion, filtration, sensory reception.
Types:
- Simple Squamous: Lines lung air sacs and blood vessels.
- Simple Cuboidal: Lines kidney tubes and gland ducts.
- Simple Columnar: Lines digestive tract and gallbladder.
- Pseudostratified Columnar: Lines trachea; moves mucus.
- Stratified Squamous: Protects skin, mouth, and esophagus against abrasion.
- Transitional: Lines bladder; stretches.

Overview: Supports, protects, and connects body tissues and organs.
Functions: Protection, support, connection, storage, transport.
Types:
- Loose (Areolar): Wraps organs; holds tissue fluid.
- Adipose: Stores fat, cushions, and insulates.
- Dense Regular: Attaches muscle to bone.
- Dense Irregular: Resists tension from many directions.
- Cartilage (Hyaline): Cushions and smoothes joints.
- Bone (Compact): Protects organs; stores minerals.
- Blood: Transports nutrients and fights infection.

Overview: Contracts for movement, posture, and heat.
Functions: Movement, posture, heat generation.
Types:
- Skeletal: Voluntary; moves bones.
- Cardiac: Involuntary; pumps heart.
- Smooth: Involuntary; moves material through organs.

Overview: Processes information and sends electrical impulses.
Functions: Communication and control.
Types:
- Neurons: Transmit electrical signals.
- Neuroglia: Support and insulate neurons.

Epidermis (Outer): Waterproof barrier without blood vessels.
- Stratum Corneum: Dead, protective outer cells.
- Stratum Lucidum: Clear layer (thick skin only).
- Stratum Granulosum: Waterproof layer.
- Stratum Spinosum: New cells and defense.
- Stratum Basale: Cell production and melanocytes.
Dermis (Middle): Flexible layer with blood vessels, nerves, and glands.
- Papillary Layer: Areolar tissue with capillaries.
- Reticular Layer: Dense tissue giving strength.
Hypodermis (Deepest): Adipose tissue that anchors skin and insulates.