Click here to load reader
Upload
jeremyschriner
View
272
Download
3
Embed Size (px)
Citation preview
Tissues
group of similar cells that perform a common function
Types of Tissues
1) Epithelium * covers body/organ surfaces * lines body cavities * forms glands
2) Connective * binds/supports/protects other tissues and
organs 3) Muscle
* moves body, materials within body 4) Nervous
* makes up the nervous system
CHARACTERISTICS OF EPITHELIA Cellularity Polarity
apical surface basal surface
Bound to underlying tissue by a basement membrane Avascularity High regenerative capacity Classified by LAYERS:
1) Simple Epithelium - one layer thick 2) Stratified Ep. - many layers thick
protective function Classified by cell SHAPE:
1) Squamous - flattened cells 2) Cuboidal - about as tall as they are wide 3) Columnar - taller than wider shaped cells
Epithelial- GLANDS
Exocrine Glands formed from epithelial tissues- they secrete their materials onto a free surface
A. Unicellular * one cell * secrete mucus
B. Multicellular * secrete materials through a duct
Connective Tissue
CHARACTERISTICS OF C.T. derived from mesenchyme (embryonic CT)
Consists of: 1) Cells 2) Fibers (protein) 3) Ground Substance
CT typically is vascular
CLASSIFICATION OF C.T.
Connective Tissue Proper Cartilage Bone (Osseous Connective Tissue)
1) Compact * outer shell of bone
2) Spongy * inner lattice-work of bone * houses hemopoietic tissue
Vascular Tissue (Blood)
Muscle Tissue
A. Skeletal Muscle Tissue * long, cylindrical cells * multinucleated * nuclei at periphery of cell * striations
B. Cardiac Muscle Tissue * short, cylindrical cells * some cells are bifurcated (branching) * has one or two centrally-located nuclei * intercalated discs * striations
C. Smooth (Visceral) Muscle Tissue * spindle-shaped cells * one centrally-located nucleus