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