Histology The study of tissues Tissue A group
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Histology The study of tissues
Tissue A group of similar cells working together to perform a common function.
4 Types of Tissues Epithelial n Connective n Muscle n Nervous n
Epithelial Tissue Covers a body surface or lines a body cavity
Characteristics of Epithelial Tissue n n Composed of closely packed cells with specialized points of attachment Have a free surface and attached to a basement membrane n n n Avascular but innervated Rapid cell division Specialized to form glands
Functions of Epithelial Tissue n n n Protection Absorption Secretion n Filtration Excretion Sensory
Classification of Epithelial Tissue Cell Shape: Squamous – flattened cells Cuboidal- boxes Columnar-tall Cell Arrangement: Simple – single layers Stratified – multiple layers
Examples of Epithelial Tissue
Simple Squamous Epithelium (Alveoli of lungs & linings of Blood vessels) n n
Simple Cuboidal Epithelium (Kidney tubules) n A. B. Cuboidal cells Nucleus of cell
Simple Columnar Epithelium (Digestive Tract) n A. B. C. Columnar cells Nucleus Cell membrane
Pseudostratified Epithelium (Trachea) n A. B. C. Basement membrane Cilia Nucleus
Stratified Squamous Epithelium (Lining of mouth) n A. B. Layers of epithelium Surface cells
Stratified Squamous Epithelial (Human Cheek Cells) A. B. C. Nucleus Cytoplasm Cell Membrane
Transitional Epithelium (Urinary bladder) n A. B. Surface cells Attached cells Specialized for stretching
Connective Tissue
Connective Tissue Found everywhere in the body; most abundant and widely distributed of all the tissues.
Characteristics of Connective Tissue n Cells widely separated by an extracellular matrix n Varying degrees of vascularization
Functions of Connective Tissue Binding and support n Protection n Insulation n Transportation n
Structural Elements n Ground Substance – unstructured material that fills the space between the cells n n Cells Fibers n n n Collagen fibers Elastic fibers Reticular fibers
Examples of Connective Tissue
Areolar Connective Tissue (beneath the skin) n A. B. C. Fibroblasts Collagen fibers Elastic fibers
Reticular Tissue (Spleen, liver, lymph nodes) n A. Reticular fibers
Adipose Tissue (Fat) n A. B. Nucleus of fat cell Fat droplet
Dense Fibrous Connective Tissue (Tendons) n A. B. Fibroblasts Collagenous fibers
Hyaline Cartilage (Ends of bones, trachea, larynx) n A. B. C. Chrondrocyte Matrix Lacuna
Bone n A. B. C. D. Central Canal Lamellae Osteocyte in lacuna Canaliculi
Blood n Leucocytes (White Blood Cells) Erythrocytes (Red Blood Cells) Sickle Cells
Muscle Tissue Responsible for body movements
Classification n Location n Skeletal Cardiac Visceral n Appearance n n n Smooth Striated Action n n Voluntary Involuntary
Skeletal Muscle: Attached to bones for movement n n n A. B. AKA: Muscle fibers Long, blunt, cylindrical Multinucleated Striated Voluntary Width of cell Nucleus
Cardiac Muscle: Found in heart n n n A. B. Involuntary Mononucleate Branched Striated Intercalated discs Nucleus
Visceral/Smooth Muscle: Found in walls of hollow organs n n n Involuntary Spindle-shaped Mononucleate No visible striations B. Nucleus
Nervous Tissue Regulates and controls body functions
2 Major Cell Types Neurons Generate and conduct nerve impulses Functional cells of the nervous system Supporting Cells Nonconducting Support, protect and insulate neurons Neuroglia
Parts of Neuron n n Cell Body Dendrite n n Receives information from sensory receptors Axon n Carries impulses away from cell body to target structure
Neurons & Neuroglia n A. B. Cell Body Cell Process (axon or dendrite) Neuroglia (small dark dots)
Neuromuscular Junction n A. B. C. Axon Motor end plates Skeletal cell
- Body tissue
- Chapter 3 cells and tissues answer key
- Body tissues chapter 3 cells and tissues
- Cells form tissues. tissues form __________.
- Chapter 3 cells and tissues
- Tissue are grouped together to form various
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- Exercise 17 gross anatomy of the brain and cranial nerves
- Connective tissue histology quiz
- Stratified columnar characteristics
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- Steps in histopathology
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- Regular connective tissue
- Study of diseased tissue
- A tissue is a group of cells having
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- Types of tissues
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- Tissues are groups of similar cells working together to
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- Types of tissues
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- Tissues are groups of similar cells working together to
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- Identify tissue
- Types of tissues
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- Chapter 3 cells and tissues figure 3-1
- Endocrine tissues
- What are the four major tissue types
- Tissues working together
- Tissues in circulatory system
- Simple columnar epithelial tissue function
- Plastid
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- Definition of periradicular disease
- What do all connective tissues have in common
- Chapter 5 tissues
- Chapter 3 cells and tissues figure 3-1