Limited matrix material Under scope appears as tightly packed sheets Epithelium attached to basal membrane (layer of connective tissue by a thin noncellular layer) Glycoproteins (basal lamina) secreted by epithelial cells and a mesh of fibers (reticular lamina) produced by the connective tissue Adhesive molecules (integrins) help bind cytoskeleton of epithelial cells to basement membrane
Avascular Diffusion allows for O2 and nutrients Can reproduce themselves
Based on cell shape Based on layers of cells
Give criteria Flat One layer Scale-like Diffusion easy through this tissue Alveoli, pleura, pericardium, lymph vessels
? What is the most widespread abundant tissue? Nerve tissue is derived from what germ layer? Define tissue Blood is a member of what tissue type?
What tissue lines body cavities? Function of epithelial tissue Where is keratinized squamous epithelium found? Know glandular differences Function of connective tissue Where is collagenous tissue found?
Matrix – intracellular material Ground substance – embedded in matrix along with fibers and fluid Qualities of matrix and fibers determine structure of tissue Blood – matrix is plasma – no fibers, many cells (except during coagulation) Number of fibers determine consistency/strength
Collagenous – white – tough and strong – occur in bundles (provides strength) Possibly accounting for more than one-fourth of protein in body Typically reflects aging process Reticular – elastic and delicate – occur in networks (supports nerves, capillaries) These are produced by fibroblasts and some other cells
Made of elastin Found in tissues that can stretch – nose, etc. What do you know about elastic products?
Protein fibers + proteoglycans (polysacharide chains – glucosamine) = matrix fluid This fluid is thick Barrier for microbes Also, transparent lubricant to hold tissue together
Structural characteristics of the intracellular material Fibrous – extracellular fibers are predominant feature Bone – fibers and hard mineral ground substance Cartilage – ground substance traps water to form a firm gel Blood - lack of fibers in matrix
Loose/ordinary/areolar Stretchable Most widely distributed of all tissues Connects adjacent structures – acts like glue that permits movement Term areolar refers to bubbly effect when pulled apart on dissection Matrix is soft, thick gel but hyaluronic acid can turn it watery IM absorption increases with watery state Strep bacterium release this acid to allow for ease of permeability
Macrophages carry on phagocytosis Type of WBC – mast cell
Predominately fat cells and few fibroblasts, macrophages and mast cells Provides padding Storage insulation
Three dimensional web (reticular network) Framework of the spleen, lymph, bone marrow Defense mechanism that acts as a filter, traps and eats invaders
Fibers packed densely in matrix Few fibroblasts Regular/irregular – depends on arrangement of fibers Dense – bundles of fibers of collagen – tendons (flexible and great strength) ligament – mostly elastic fibers Irregular – bundles not in parallel rows, but thick mat - dermis
Osseous Most specialized of connective tissue Collagen and mineral salts (65%) which creates density and strength Support/protection/mineral reserve Basic unit of the bone is the osteon (Haversian system) Osteocytes located in lacunae – arranged in concentric manner called lamellae Canaliculi connect each lacuna and osteocyte with bl vessels in Haversian canal
Only has one cell type – chondrocyte Chondrocytes produce fibers and tough gristle ground substance Also found in lacunae Avascular – diffusion Cartilage injury heals slowly
Fibrocartilage – strongest/most durable Strong densly packed collagen Intervertebral disks,meniscus Elastic cartilage – little collagen/great amt of elastic fibers Great flexibility External ear, voice box, larynx Hyaline (glass) - low amount of collagen – shiny/transparent Esophageal rings, end of bones
Most unusual Liquid state No ground substance or fibers Plasma (55%) and formed elements (cells) Body transport Maintains body temp. Regulates ph of body fluids Phagocytosis/defense Hematopoiesis – red marrow
How are salivary glands classified? What is known as loose ordinary connective tissue? What is the purpose of adipose tissue? What kind of tissue is red bone marrow? Another name for skeletal muscle
What tissue is composed of neurons? Most prevalent cartilage? Cilia are found on what types of cells? Most complex tissue Mature bone cells are called – Characteristics of skeletal muscles