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Introduction to Tissues

Introduction to Tissues. HISTOLOGY. Biology of Tissues Understanding the structure and function of tissues will help you understand the structure and function of the entire body. Types of Tissue. Several Subtypes in the body but 4 main types of tissues Epithelial Connective Muscle

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Introduction to Tissues

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  1. Introduction to Tissues

  2. HISTOLOGY • Biology of Tissues • Understanding the structure and function of tissues will help you understand the structure and function of the entire body

  3. Types of Tissue • Several Subtypes in the body but 4 main types of tissues • Epithelial • Connective • Muscle • Nervous

  4. EPITHELIAL • Function: covers and protects the body; lines cavities; functions in absorption, secretion and excretion; glandular activity • Structure: form in either sheets or glands • Examples in the body: skin; lining of Respiratory, digestive, reproductive tracts; glands http://www.hartnell.edu/tutorials/biology/images/Epithelial_types.jpg

  5. CONNECTIVE • Function: support body structure; transport substances • Structure: sparsely arranged containing structural fibers • Examples: bone; cartilage; tendon; ligaments; blood; fat http://www.eoearth.org/files/123901_124000/123959/250px-Tissue-fig-3.gif

  6. MUSCLE • Function: movement of body and organs; production of heat • Structure: long fibrous cells • Examples: heart; muscles in head, neck, arms, etc; organ muscles such as stomach http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19917.jpg

  7. NERVOUS • Function: communication; regulation of body function • Structure: many cell types • Examples: brain, spinal cord, nerves, sensory organs http://encyclopedia.lubopitko-bg.com/images/Nervous%20tissue1.jpg

  8. Embryonic Tissue Development • Four major tissue types develop early in embryonic development (within the first 2 months of development) • Blastocyst: hollow ball of cells • Implants in uterus and within 2 weeks primary germ layers have developed • Endoderm, Ectoderm, Mesoderm • Called Gastrulation • Each germ layer develops into different systems

  9. http://www.stemcure.com/images/pic_sc_stemcell.gif

  10. Ectoderm • Epidermis • Lining of mouth, anus, nostrils • Sweat and sebaceous glands • Hair • Tooth enamel • Nervous system • Sensory parts of eyes, nose, ear

  11. Mesoderm • Muscles • Bone • Cartilage • Blood • Lining of Blood Vessels • Dermis of skin • Organs of Excretory and Reproductive system • Connective Tissue

  12. Endoderm • Lining of digestive system and respiratory system • Portions of liver and pancreas • Urinary bladder • Lining of urethra • Thyroid, parathyroid, thymus

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