Histology: Human Tissues

Histology: Human Tissues

1. Epithelial

   • 3 Surfaces of Epithelial Cells:
     • apacial surface: exposed to the body
     • lateral surface: side of the cells
     • basal surface: attached to the basement membrane
   • avascular-: they aren't supplied with blood BUT they are supplied with nerve suuply.
   • Epithelial tissue: lines body cavities & cover internal & external body surfaces; stain
     • little extracellular matrix between closely packed cells (very little white space between cells)
   • 2 Types of Epithelial Tissue: 1.covering & lining epitheliaum, 2.glandular epithelium
     • Covering and Lining: classified according to the arrangement of cells in layers and the cell shape
     • Glandular: classified as either endocrine or excorine
       • Endocrine: secretes hormones into the bloodstream
       • Exocrine: secrete products through ducts & empty at covering lining epithelium
   • 3 Arrangements: simple-1 single layer, stratified-multiple layer, pseudostratified-appears to have more then one layer
     • Stratified Squamous Epithelium
     • Simple Columnar Epithelium
     • Pseudostratified Columnar Epithelium
     • Stratified Cuboidal Epithelium
   • Cell shapes: squamous, cuboidal, columnar, transitional
     • Simple Squamous Epithelium
     • Stratified Columnar Epithelium
     • Transitional Epithelium
     • Simple Cuboidal Epithelium

2. Muscular

   • Skeletal Muscle Tissue
     • pulls on bones allowing body movements; voluntary and striated
   • Cardiac Muscle Tissue
     • forms wall of ehart, pumps blood through blood vessels; involuntary and striated
   • Smooth Muscle Tissue
     • found in walls of hollow organ like bladder; involuntary and not striated
   • Functions rpoduces movement, releases heat, maintains posture, supports soft tissue, moves substances:

3. Connective

   • Loose Connective Tissue
     • Areolar
     • Adipose
     • Reticular
   • Cartilage
     • Hyaline
     • Fibrocartilage
     • Elastic
   • Dense Connective Tissue
     • Regular
     • Irregular
     • Elastic
   • Bone
   • Liquid Connective Tissue
     • Blood
     • Lymph

4. Nervous

   • Function: conducts nerve impulses
   • Neurons
     • converts stimuli into nerve impulses and conduscts them
   • Neuroglia
     • do not generate nerve impluses but serve supportive functions

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