Tisses

TISSUE

Need for cells to cooperate
Similar in 
     Structure
     Function
     Embryonic origin
     Bound together with
          intercellular materials

Types of Tissue
	Epithelium
	Connective
	Muscular
	Nervous



Germ Layers
     Endoderm 
          Digestive
          Associated structures

     Mesoderm
          Skeleton
          Muscle

     Ectoderm
          Outer covering of skin
          Nervous system

Epithelium

Epithelial cells
     Connected together
	Many cells
	Little matrix
     Attached to

Supporting layer
     Basement  Membrane
     Lamina Propria
     Separates from underlying tissues

Functions
     Protection
     Absorption
     Excretion
     Secretion



Junctions
     Tight
          Form barrier

     Gap
          20 Angstrom separation
          Bridges
          Transport between cells
               Ions
               Molecules

     Intermediate
          Cemented

     Desmosome
          Fiber bound



                          TYPES


Simple - Single layer
Stratified - Several distinct layers
Pseudostratified 
     Appear as several layers
     All contact BM

                         SHAPES

Squamous - Flat and thin
Cuboidal - Square
Columnar - Rectangular
Flask - Goblet shaped
Pyramidal - Pyyramid shaped
Spindle - Long and thin
Transitional - Changes w/organ state

Connective Tissue

MUSCLE

Smooth
Skeletal
Cardiac

NERVE

Neurons
Glial cells
     Astrocytes - blood-brain barrier
     Microglia - WBC of CNS
     Ependimal - CSF production
     Oligodendrocytes - Myelin in CNS
     Schwann - Myelin in PNS