HISTOLOGY Flashcards
memorization
The microscopic study of the tissues of the body
Histology
Four types of tissue:
- Epithelial tissue
- Connective tissue
- Muscular tissue
- Nervous tissue
Function of tissues
- Epithelial tissue -
- Connective tissue -
- Muscular tissue -
- Nervous tissue -
Function of tissues
- Epithelial tissue - COVERS body surfaces, lines body cavities, and form glands
- Connective tissue - SUPPORTS the other three basic tissues, both structurally and functionally
- Muscular tissue - Made up of contractile cells and is responsible for MOVEMENT
- Nervous tissue - CONTROL; receives, transmits and integrates information from outside and inside the body to CONTROL activities of the body
Germinal Tissue Layers:
- Ectoderm - outermost layer
- Mesoderm - middlemost layer
- Endoderm - innermost layer
Germinal tissue origin of epithelial tissue:
Ectoderm, mesoderm and ectoderm
Germinal tissue origin of connective tissue:
Mesoderm
Germinal tissue origin of muscular tissue:
Mesoderm
Germinal tissue origin of nervous tissue:
Ectoderm
It is the lining, covering, and glandular tissue of the body; functions include protection, absorption and secretion;
Epithelial tissue
Two (2) types of epithelial tissue:
- Covering or lining epithelium
- Glandular epithelium
Covering or lining epithelium is classified according to _______ and _____:
Number of cellular layers and
Cell shape
Classification of covering/lining epithelium according to the NUMBER OF CELLULAR LAYERS:
- Simple - one layer of cells
- Pseudostratified - special type of simple epithelium
- Stratified - Two or more layers
- Transitional - special type of stratified epithelium that can be greatly stretched
Classification of covering/lining epithelium according to CELL SHAPE:
- Squamous - Flat and thin cells
- Cuboidal - CUbe-shaped cells, as wide as they are tall
- Columnar - Tall and thin cells, cells are taller than they are wide
What type of covering/lining epithelium is located in the alveoli of the lungs and blood vessel endothelium:
Simple squamous
What type of covering/lining epithelium is located in the surface of the ovaries, kidney tubules and thyroid follicles?
Simple cuboidal
What type of covering/lining epithelium is located in the lining of the digestive tract from stomach to anus?
Simple columnar
Type of covering/lining epithelium located in the ling of nasal cavity and nasal sinuses; trachea
Pseudostratified columnar
Type of covering/lining epithelium located in keratinized: skin (epidermis) and non-keratinized: mouth, throat and esophagus:
Stratified squamous
Type of lining/covering epithelium located in the sweat gland ducts, ovarian follicles
Stratified cuboidal
Type of lining/covering epithelium located in the mammary gland ducts, larynx
Stratified columnar
Type of lining or covering epithelium in the lining of the urinary bladder, urethra, ureter
Transitional
Two types of glandular epithelium:
- Endocrine gland
- Exocrine gland
Often called as the ductless glands wherein the secretions diffuse directly into the blood vessels that weave through the glands
ENDOCRINE GLAND
Examples of endocrine glands:
Pituitary gland
Thyroid gland
Adrenal glands
PANCREAS
Gland that retain their ducts and their secretion empty through the ducts to the epithelial surface
EXOCRINE GLAND
Examples of exocrine glands:
Sweat glands
Sebaceous glands
Salivary glands
PANCREAS
Classification of exocrine gland:
- Structural classification
- Modes of secretion
Structural classification of exocrine gland:
- Simple exocrine glands - have a single, nonbranched duct
- Compound exocrine glands - have multiple, branched duct
Modes of secretion of exocrine gland:
- Merocrine - Release of secretory products by exocytosis
- Apocrine - release of secretory products as pinched off fragments of the gland cells 9partial removal of the cell)
- Holocrine - shedding of the entire cells and become part of the secretion (complete removal of the cell)