tissues definition: tissues definition: collections of cells
TRANSCRIPT
Tissues
• Definition: Collections of cells and extracellular materials that perform specific functions
Tissues
• Intercellular Connections – Gap junctions
– Tight junctions
– Intermediate junctions and desmosomes
• Early Embryonic Tissue: the Primary Germ Layers– Ectoderm
– Mesoderm
– Endoderm
–(click here for embryonic/fetal development animation)
• Primary Tissue Types (Derived from the Embryonic Tissue)
– Epithelial Tissue
– Connective Tissue
– Muscle Tissue
• Primary Tissue Types (Derived from the Embryonic Tissue)
– Epithelial Tissue
– Connective Tissue
– Muscle Tissue
– Neural Tissue
•Characteristics of Epithelial Tissue
– Layers of cells that form a barrier
– Free surface
– Basement membrane
•Characteristics of Epithelial Tissue
– Layers of cells that form a barrier
– Free surface
– Basement membrane
– Closely packed cells
•Characteristics of Epithelial Tissue
– Layers of cells that form a barrier
– Free surface
– Basement membrane
– Closely packed cells
– Avascular
•Characteristics of Epithelial Tissue– Layers of cells that form a barrier
– Free surface– Basement membrane– Closely packed cells– Avascular– Regeneration
•Functions of Epithelial Tissue
– Physical protection
– Permeability Control– Sensations
– Secretions
Classification of Epithelial Tissue
• Functional Classification– Glandular epithelium
– Lining and covering epithelium
• Anatomical Classification (based on shape of cells and number of cell layers)– Simple Squamous
– Simple Cuboidal
• Anatomical Classification (based on shape of cells and number of cell layers)– Simple Squamous
– Simple Cuboidal
– Simple Columnar
• Anatomical Classification (based on shape of cells and number of cell layers)– Simple Squamous– Simple Cuboidal– Simple Columnar– Stratified Squamous
• Anatomical Classification (based on shape of cells and number of cell layers)– Simple Squamous– Simple Cuboidal– Simple Columnar– Stratified Squamous– Transitional
• Anatomical Classification (based on shape of cells and number of cell layers)– Simple Squamous– Simple Cuboidal– Simple Columnar– Stratified Squamous– Transitional– Pseudostratified Columnar
• Anatomical Classification (based on shape of cells and number of cell layers)– Simple Squamous– Simple Cuboidal– Simple Columnar– Stratified Squamous– Transitional– Pseudostratified Columnar
• Maintenance of Epithelial Structural Integrity – Intercellular connections
• Desmosomes and intermediate junctions
• Maintenance of Epithelial Structural Integrity – Intercellular connections
• Desmosomes and intermediate junctions
– Basement membrane