Histology- the study of tissues

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Presentation transcript:

Histology- the study of tissues

4 tissue types Epithelial Tissue Muscle Tissue Nervous Tissue Covers both internal and external surfaces Muscle Tissue Highly specialized tissue designed to contract Nervous Tissue 2 types of cells neurons (carry signal) and neuroglia (care for and support neurons). Connective Tissue Connects, protects, supports, insulated, energy storage, blood formation, & body tissue repair (Scars)

Epithelial Tissue # of layers Cell shape Simple one Stratified  >1 Cell shape Cuboidal- Cube shaped Columnar – column shaped Sqamous- squished like a pancake.

Epithelial Tissue- Simple Columnar Squamous Cuboidal

Simple Squamous Cell Membrane Nucleus Single layer of Flattened cells

Simple Cuboidal Cell Membrane Nucleus Basement Membrane Single layer Cube shaped cells

Simple Columnar Single layer Column shaped Cell Membrane Nucleus cells Basement Membrane

Epithelial Tissue- Stratified Squamous Cuboidal Columnar

Stratified Squamous Cell Membrane Nucleus Basement Membrane

Stratified Cuboidal-Not on practical Found: Sweat gland ducts Ovarian follicular cells Salivary gland ducts Function: Secretion Absorption Protection against infection

Stratified Columnar- Not on practical Found: Mammary gland ducts Larynx Portions of the male urethra Function Protection secretion

Exceptions Pseudostratified Ciliated columnar Transitional Epithelium Collapsed Distended

Pseudostratified Ciliated columnar Cell Membrane Nucleus Cilia Basement Membrane Free surface

Transitional Epithelium Nucleus Cell Membrane Basement membrane

Muscle Tissue Highly specialized tissue designed to contract 3 types: Skeletal Muscle Cardiac Muscle Smooth Muscle

Skeletal Muscle Striations Multiple Nuclei Muscle Fibers

Cardiac Muscle Intercalated Disk Nucleus Striations

Smooth Muscle Nucleus Muscle cell

Nervous Tissue Two major cell populations Neurons- specialized cells that receive stimuli and conduct impulses all over the body Neuroglia- special cells that protect, support, and insulate the more delicate neurons

Motor Neuron

Multipolar neuron/ Motor neuron Glial Cells Dendrite Axon Hillock Nucleolus Cell body Axon Nucleus

Connective Tissue Usually have a rich blood supply Composed of many cell types Great deal of non-cellular, nonliving material between cells (Matrix) Jelly Fibers Interstial fluid, cell adhesion proteins, & proteoglycans Dependent on combo is can be liquid, semisolid, gel-like or very hard Collagen fibers: very strong and flexible but not elastic Elastic fibers- can be stretched but return to their original shape Reticular fibers- fine collagen fibers, not strong but fill spaces

Connective Tissues (CT)- all derived from mesenchyme CT proper Areolar CT Dense CT Regular Irregular Adipose Reticular Cartilage Hyaline Cartilage Fibrocartilage Elastic cartilage Bone Blood

Loose (Areolar) Connective tissue Reticular Fiber Collagen Fiber Nucleus Elastic fiber

Loose connective tissue Adipose Tissue Reticular tissue Adipocyte Cell membrane Reticular fiber Nucleus Cell of organ being supported by the fibers

Dense connective tissue Nucleus Collagen Fiber Collagen Fiber Nucleus Dense Regular CT Dense Irregular CT

CT-Cartilage Hyaline Cartilage fibrocartilage Elastic Cartilage

Hyaline Cartilage Chondrocyte Lacuna Perichondrium

Fibrocartilage Collagen fibers Chondrocyte

Elastic Cartilage Lacuna Elastic Fibers Chondrocyte

Bone Osteon Lacuna Central canal Concentric Lamella

Blood Red Blood Cell Plasma White Blood Cell Platelet