Histology: The Studyof Tissues
Four Categories of Tissues
• Epithelial Tissue
• Connective Tissue
• Muscle Tissue
• Nervous Tissue
Know functions
at this level
ONLY!
I. Epithelial Tissues
• Functions: protection, absorption, secretion, excretion
• Features: lack blood vessels, tightly packed, free edge
• Classified by shape and number of layers (for the most part!)
Simple Squamous Epithelium
Simple Cuboidal Epithelium
Simple Columnar Epithelium
Pseudostratified Columnar Epithelium
Stratified Squamous Epithelium
Stratified Columnar Epithelium
Stratified Cuboidal Epithelium
Transitional Epithelium
Glandular Epithelia
• Classified based on:
• How secretions move through the body:
• Exocrine vs. Endocrine glands
• How secretions are released from the gland:
• Apocrine, Merocrine, Holocrine secretion
II. Connective TissuesCells are widely spaced with extracellular material (matrix) between the cells
Loose Fibrous Connective Tissue (Areolar)
Dense Fibrous Connective Tissue
Adipose Tissue
Cartilage
Cartilage
Bone (Osseous Tissue)
Blood
III. Muscle Tissue
• Muscle tissue is conductive
• Muscle tissue is contractile (unique to this tissue)
• Three types:
• Skeletal
• Cardiac
• Smooth
Nervous tissue
• Nervous tissue is conductive
• Composed of:
1. neurons which generate and conduct impulses
2. neuroglial cells provide anatomical and functional support to the neurons