CONNECTIVE TISSUE

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Functions of Connective Tissue

binding, support, protection, insulation, and transportation.

Mesenchyme

all connective tissue arise from this embryonic tissue. forms from the mesoderm layer and eventually differentiates into all other connective tissues.

Connective Tissue composed of...

mainly nonliving extracellualr matrix that separates the cells of the tissue.

Ground Substance

unstructured material that fills the space btwn the cells and contains the fibers.

Collagen Fibers

extremely strong provide high tensile strength.

Elastic Fibers

contain elastin: able to stretch and recoil.

Reticular Fibers

fine, collagenous fibers that form networks.

Structural Connective Tissue cell types

Each major class has a fundamental cell type that exsists in immature and mature forms.

Areolar CT

loose CT proper; bind body parts together while allowing them to move freely over one another, wraps small blood vessels and nerves, glands, subcutaneous tissue.

Adipose CT

loose CT proper; fat, tissue, richly vascularized, functions in nutrient storage, protection, and insulation.

Reticular CT

loose CT proper; forms internal framework of lymph nodes, spleen, and the bone marrow.

Dense Regular CT

dense CT proper; closely packed bundles of collagen fibers running same direction, tendons and ligaments.

Dense Irregular CT

dense CT proper; thick bundles of collagen fibers arranged in an irregular fashion, found in dermis.

Hyaline Cartilage

very abundant, firm support with some pliability, avascular, lacks nerve fibers.

Elastic Cartilage

found where strength and stretchability are needed, external ear, avascular, lacks nerve fibers.

Fibrocartilage

found where strong support and ability to withstand heavy pressure, intervertebral discs.

Bone

osseous tissue; ability to support and protect body structures due to hardness.

Blood

classified as a connective tissue b/c it developed from mesenchyme; blood cells and plasma proteins

Connective tissue producing cells

-blasts; fibroblasts, chondroblasts, osteoblasts, hemocytoblasts.

Connective Tissue maintaining cells

-cytes; fibrocytes, chondrocytes, osteocytes, erythrocytes, leucocytes.

Membranes

epithelial sheet+connective tissue proper. simple organs. cutaneous membrane=the skin. mucous membrane=lines lumen of all systems which open to the enviroment. Serous membrane=lines body cavities (mesothelium). Parietal/Visceral include pleura, pericardium, peritoneum.

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