Where is simple squamous tissue found?
- Air sacs of lungs,
- Blood vessels
- Lymphatic vessels
- Lining of ventral cavities(serosae)
Describe simple squamous epithelium.
- Single layer of flattened cells
- Disc-shaped nuclei and sparse cytoplasm
- Simplest of the epithelia
Describe simple cuboidal epithelium
- Single layer of cube-like cells
- Large, spherical central nuclei
Where is simple cuboidal epithelium located?
- Kidney tubules
- Ducts and secretory portions of the small glands
- Ovary surface
Describe simple columnar epithelium.
- Single layer of tall cell
- Round to oval nuclei; some bear cilia
- Layer may contain mucus-secreting unicellular glands(goblet cells)
What is the location of simple columnar epithelium?
- Non-cilated type most of the digestive tract, gallbladder, and excretory ducts of some glands
- Ciliated variety lines small bronchi, uterine tubes, and some region of the uterus.
Describe pseudostratified columnar epithelium.
- Single layer of cell, with differney heights.
- Nucei are seen at different levels.
What is the location of pseudostratfied columnar epithelium?
- Non-ciliated type in male's sperm-carrying duct and ducts of large glands
- Ciliated variety lines the trachea, most of the upper respiratory tract.
Describe stratified squamous epithelum
- Several layers of cells
- Basal cells are cuboidal or columnar and metabolically active
- Surface cells are flattened and are keratinized
Where can you find stratified squamous epithelium?
- Non-keratinized: moist lining of the esophagus, mouth, and vagina
- Keratinized: forms the epidermis of the skin; dry membrane
Describe stratified cuboidal epithelium
Two layers of cube-like cells
Where can you find stratified cuboidal epithelium?
- Largest ducts of sweat glands
- Mammary glands
- Salivary Glands
Describe stratified columnar epithelium.
- Several layers;
- Basal cell usually cuboidal
- Superficial cells elongated and columnar
Where can you find stratified columnar epithelium?
Describe transitional epithelium.
Resembles both stratified squamous and stratified cuboidal; surface cells dome shaped or squamous like
Where can you find transitional epithelium?
Lines the ureters, urinary bladder, and part of the urethra
Describe mesenchyme(connective tissue)
Embryonic connective tissue; gel-like ground substance containing fibers; star-shaped mesenchymal cells
Where can you find mesenchyme(connective tissue)?
Primarily in embryo
Describe areolar loose connective tissue
- Gel-like matrix
- Contains all three fibers: elastic, collagen, and fibroblast nuclei
Where are areolar loose connective tissue located?
- Widely distributed under epithelia of body; forms lamina propria of mucous membranes.
- Surrounds capillaries
Where can you find adipose loose connective tissue?
- In breast
- Under skin
- Around kidneys
Describe adipose loose connective tissue
Packed with fat cells(adipocytes); nuclei pushed to the side due to fat
Describe reticular loose connective tissue
Network of reticular fibers in a typical loose ground substance
Where can you find reticular loos connective tissue?
Describe dense regular; dense connective tissue.
- Parallel collagen fibers
- Major cell fibroblast
Where can you find dense regular; dense connective tissue?
Describe elastic; dense connective tissue
Contains a high proportion of elastic fibers
Where can you find elastic dense connective tissue?
- Walls of arteries
- Within walls of bronchi
Describe dense irregular; dense connective tissue.
- Irregularly arranged collagen fibers
- Major cell fibroblast
Where can you find dense irregular connective tissue?
- Fibrous joint capsule
- Dermis of the skin
Describe hyaline cartilage
- Amorphous but firm matrix
- Chondroblasts produce the matrix and when mature, lie in lacunae
- Collagen fibers form an imperceptible network
Where can you find hyaline cartilage?
- Costal cartilages of the ribs
- Cartilage of the nose, trachea, and larynx
Describe elastic cartilage
Similar to hyaline cartilage but with more elastic fibers in matrix
Where can you find elastic cartilage?
- Supports the external war(pinna)
- Matrix similar to but less firm than in hyaline cartilage
- Thick collagen fibers predominate
Where can you find fibrocartilage?
- Intervertebral discs
- Pubic symphysis
Where can you find osseous connective tissue?
Describe osseous tissue.
- Hard, calcified matrix containing many collagen fibers
- Osteocytes lie in lacunae
Describe blood connective tissue
Red and white blood cells in fluid matrix(plasma)
Where can you find blood?
In Blood vessels
Where can you find nervous tissue?
Describe nervous tissue
Neurons are branching cells; cells processes that may be quite long extend from the nucleus-containing cell body
Describe skeletal muscle
Long, cylindrical, multinucleate cells; obvious striations
Describe cardiac muscle
Branching, striated, generally uninucleate cells
that interdigitate at specialized junctions
Where can you find skeletal muscle?
Skeletal muscles attached to bones
Where can you find cardiac muscle?
Walls of the heart
Describe smooth muscle
- Spindle-shaped cells with central nuclei,
- No striations,
- Arranged closely to form sheets
Where can you find smooth muscle?
Mostly in the walls of hollow organs