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15 Cards in this Set

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EPITHELIAL TISSUE

- found between differing environments


- ex: skin separates body's external enviro from that within

FUNCTION OF EPITHELIAL TISSUE

1. protection


2. absorption


3. secretion


4. sensory reception

CHARACTERISTICS OF EPITHELIUM

1. cellularity


2. innervated but avascular


3. regeneration

1. CELLULARITY

- close compacted network of cells within an extracellular material that binds cells together

2. INNERVATED BUT AVASCULAR

- epithelia = innervated by nerves which are receptive to specialized stimuli

- epithelia don't contain blood vessels


- nourishment provided by constituents of blood that diffuse from underlying connective tissue


3. REGENERATION

- epithelium has a high regenerative capacity

CLASSIFICATION OF EPITHELIA

- naming epithelia requires 2(+) words




first describes the layering...


A. simple - single layer of cells


B. stratified - multiple layer of cells




second describes the shape...


A. cuboidal - cube like


B. squamous - square-like


C. columnar - column-like


TYPES OF EPITHELIA




WHAT, FUNCTION, WHERE?

1. simple cuboidal epithelium


2. simple columnar epithelium


3. pseudo-stratified columnar epithelium


4. stratified squamous epithelium


5. stratified cuboidal epithelium


6. stratified columnar epithelium


7. transitional epithelium

1. SIMPLE CUBOIDAL



WHERE:


- kidney tubules


- secretory portions of glands


FUNCTION:


- secretion


- absorption

2. SIMPLE COLUMNAR

WHAT:


- single layer of tall cells w. oval nuclei


- some may have cilia or contain mucous secreting unicellular glands




WHERE:


- nonciliated type:


- lines digestive tract, gall bladder, excretory ducts of glands


- ciliated type:


- lines small bronchial tubules & portions of uterus




FUNCTION:


- absorption


- secretion of mucous


- ciliated propels substance to/from bronchioles & uterine tubes

3. PSEUDO-STRATIFIED COLUMNAR

WHAT:


- single layer of cells containing different heights


- some contain cilia, others don't


WHERE:


- non-ciliated type:


- ducts of large glands


- parts of urethra


- ciliated:


- lines trachea & respiratory tract


FUNCTION:


- secretion of mucous


- ciliated propels mucous



4. STRATIFIED SQUAMOUS

WHERE:


- outer layers of skin


- lining of esophagus


- lining of mouth & vagina


FUNCTION:


- protects underlying structures from abrasions

5. STRATIFIED CUBOIDAL

WHERE:


- ducts like sweat glands, mammary glands, salivary glands


FUNCTION:


- protection

6. STRATIFIED COLUMNAR

WHERE:


- rare but found in urethra of male


FUNCTION:


- protection


- secretion

7. TRANSITIONAL

WHAT:


- can appear to be moving between cubelike & columnlike but move to squamous shape


WHERE:


- bladder


- lining of uterus


FUNCTION:


- permit distension w.o disruption