Tissues
Group of cells with similar structures or related function
4 Basic types of tissues
Epithelial
Connective
Muscle
Nervous
Epithelial
Covering
Connective
Support
Muscle
Movement
Nervous
Communication
Histology
Study of tissues
Primary Germs Layers
Formation of the 1st embryonic events
3 Different layers that give rise to the four primary tissues
Ectoderm
Mesoderm
Endoderm
Ectoderm
Superficial- nervous tissues and skin
Mesoderm
Middle- muscle, connective tissues
Ectoderm
Deep- lining of digestive system, respiratory tract
Epithelial Characteristics
Tightly packed cells forming sheets
Little to no intracellular space
High regeneration
Supported by a CT basement membrane
Avascular- No blood vessels
Epithelial Locations
Skin, membranes, lining of cavities
Forming glands of the boby
Epithelia Classification
Has two part names
1st part tells
numbers of layers
Simple
one layer
Stratified
many layers
2nd part tells
shape of the cell
Squamous
Flattened, scale like
Cuboidal
boxlike
Columnar
taller, and wide
Others
transitional, glandular, pseudostratified
Simple Squamous Epithelia
Single layer;flattened
Nuclei location: central
Simple Squamous Epithelia
Function
Allowing for fast filtration or diffusion of substances
Simple Squamous Epithelia
Locations
Air sacs of lungs, lining of blood vessels and heart chambers, serous membranes
Simple Cuboidal Epithelia
Single layer of cube
Nuclei Location: central
Simple Cuboidal Epithelia
Functions
Absorption and Secretion
Simple Cuboidal Epithelia
Locations
Duct walls of gland, Kidney tubules, surface of ovary
Simple Columnar Epithelium
Single layer Tall
Nuclei Location: Bottom of cell
Simple Columnar Epithelium
Functions
Absorption and secretion
Simple Columnar Epithelium
Locations
Digestive tract, Gland ducts
Gallbladder
Ciliated Simple Columnar Epithelium
Ciliated Simple Columnar epithelium
Single layer of tall
Contains: Cilia
May Contain goblet cells produce mucus
Ciliated Simple Columnar Epithelium
Secretion and Movement
Ciliated Simple Columnar Epithelium
Small bronchi, uterine/fallopian tubes, auditory tubes
Several layers of flat cells
May contain a tough protective protein: Keratin
Protection and Durability
Wear and tear areas
1. epidermis carries keratin
2. Mouth, tongue, esophagus
3. Vagina
Pseudostratified Columnar Epithelium
One layer of column but appears as several layers
Surface my contain: cilia
May contain: Goblet cell
Pseudostratified Columnar Epithelium
Functions
Absorption and Secretion
Movement of mucous
Pseudostratified Columnar Epithelium
Location of ciliated
Upper respirator tract
Location of nonciliated
Ducts that carry sperm
Transitional Epithelium
Appearance varies
Transitional Epithelium
Function
Allows for stretch and distension
Transitional Epithelium
Location
Bladder and Ureters-connects kidneys to bladder