General Overview

Tissues

A group of specialized cells with a common embryonic origin that carries out a specific function

Histology

The study of microscopic tissues

Tissue: Four Primary Types

• Epithelial Tissue: Lines can covers body surfaces or form glands

• Connective Tissue: Provides structural support and internal framework

• Muscular Tissue: Provide movement, insulation, and protection

• Nervous Tissue: Transmit electrical impulses to coordinate the body

Embryonic Origin

The development of body tissues that resembles as germ layers

Embryonic Origin: Three Layers

• Ectoderm: The outer layer of tissues that rises from the integumentary and nervous system

• Mesoderm: The middle layer of tissues that rises from the cardiovascular system, connective tissues, and muscular system

• Endoderm: The inner layer of tissues that rises from the lining of digestive and respiratory tracts and its accessory organs and glands

Tissue Membrane

Thin layer of cells that cover or line a body surface

Tissue Membrane: Mucous Membrane

Membranes of epithelial tissues that line the digestive, respiratory, and urogenital tract, which provide protection, mucous production, and enzyme secretion

• Protection: Makes it harder for pathogens and microbes to penetrate through

• Mucous Production: Produces mucous to prevent dehydration, provide lubrication, and trap particles

• Enzyme Secretion: Secretes enzymes to catalyze ingestion and digestion

Tissue Membrane: Serous Membrane

Membranes of areolar connective tissues that cover the organs in the anterior cavity, which produce serous fluid to reduce friction

Pleura: Covers and houses the lungs

Pericardium: Covers and houses the heart

Peritoneum: Covers and houses the visceral organs in the abdominal cavity

Tissue Membrane: Synovial Membrane

Membranes of synoviocytes that line hollow cavities in joints to produce synovial fluid to reduce friction, nourish cartilage, and clear microbes

Tissue Membranes: Cutaneous Membrane

Membranes tissues that cover the entire body surface, known as the skin, which are made up of two layers

• Epidermis: The superficialer layer of the skin

• Dermis: The deep layer of the skin