Histology

Histology

1. Study of Tissue

   • Types of Tissues
     • Epithelial
       • Definition:
         • Tissues composed of layers of closely spaced cells
           • Function
             • Forms glands
             • Serve for protection
             • Cover organ surfaces
             • Secretion
             • Absorption
             • Filtration
               • Definition:
                 • Movement down pressure gradient
             • Sensation (5 senses)
             • Excretion (remove waste)
           • Locations
             • Epidermis
             • Inner lining of digestive tract
             • Liver
               • And other glands
           • Characteristics:
             • Cellularity (How the matrix forms)
               • Closely packed together like continous sheets
             • Avascular but innervated
     • Connective
       • Definition
         • Tissue with usually more matrix than cell volume
           • Function
             • Support
             • Bind
             • Protect organs
           • Location
             • Tendon and ligament
             • Cartilage and bone
             • Blood
     • Nervous
       • Definition
         • Tissue containing excitable cells
           • Function
             • Rapid transmission of coded information to other cells
           • Location
             • Brain
             • Spinal cord
             • Nerves
     • Muscular
       • Definition
         • Tissue composed of elongated, excitable muscle cells
           • Function
             • Contraction
           • Location
             • Skeletal muscles
             • Heart (Cardiac muscle)
             • Smooth muscles (Walls of viscera)
   • Definition of tissue
     • Group of cells that have the same function
   • All contain:
     • Matrix (Extracellular fluid)
       • Composed of:
         • Ground substance
           • Other names:
             • Clear gel
             • Tissue fluid