Mesenchyme is embryonic connective tissue. It is an undifferentiated tissue found in the embryo. Mucous connective tissue is a type of embryonic connective tissue; it is a subset of mesenchyme. Wharton's jelly is mucous connective tissue. Loose irregular connective tissue is areolar tissue. Dense irregular connective tissue is seen in the dermis. Dense regular connective tissue comprises tendons and ligaments.

Connective tissue develops from mesenchyme.

Connective tissue can be sub-classified into connective tissue proper, specialized connective tissue and embryonic connective tissue. Connective tissue proper consists of loose irregular connective tissue and dense connective tissue (regular and irregular). Specialized connective tissue includes cartilage, bone, adipose tissue, blood and hemopoietic tissue, and lymphatic tissue. Embryonic connective tissue includes mesenchyme and mucous connective tissue.

Of the four basic tissue types (epithelium, connective tissue, muscle and nervous tissue), connective tissue is the most diverse. Bone marrow, articular cartilage, mesenchyme and fat are all composed of connective tissue. The heart is a muscle. The main tissue type in the heart is cardiac muscle. Note: Please be aware that there is connective tissue in the heart. The blood in the heart, for example, is composed of connective tissue. The pericardium is also composed of connective tissue. However, the primary tissue composing the heart is cardiac muscle.

There are three types of fibers found in connective tissue: collagen fibers, elastic fibers, and reticular fibers. Collagen fibers are the most abundant fiber type in connective tissue. Purkinje fibers are seen in the heart. Purkinje fibers are specialized muscle fibers.

Myofibroblasts contain properties of both fibroblasts and smooth muscle cells. Fibroblasts, histiocytes, plasma cells, and mast cells are routinely seen in loose connective tissue. Fibroblasts produce collagen. The fibroblast also produces the ground substance in connective tissue. Myofibroblasts contain properties of both fibroblasts and smooth muscle cells. The histiocyte is a connective tissue macrophage. Plasma cells are derived from B lymphocytes. Mast cells secrete histamine. Mast cells also secrete heparin, SRS-A (slow reacting substance of anaphylaxis, ECF-A (eosinophilic chemotactic factor of anaphylaxis.

Of the four basic tissue types (epithelium, connective tissue, muscle and nervous tissue), connective tissue is the most diverse. Blood, bone, tendon, and intervertebral discs are all composed of connective tissue. The myometrium is the muscular layer of the uterus. Thus, the myometrium is composed of muscle tissue.

Connective tissue can be sub-classified into connective tissue proper, specialized connective tissue and embryonic connective tissue. Connective tissue proper consists of loose irregular connective tissue and dense connective tissue (regular and irregular). Specialized connective tissue includes cartilage, bone, adipose tissue, blood and hemopoietic tissue, and lymphatic tissue. Embryonic connective tissue includes mesenchyme and mucous connective tissue.

Connective tissue can be sub-classified into connective tissue proper, specialized connective tissue and embryonic connective tissue. Connective tissue proper consists of loose irregular connective tissue and dense connective tissue (regular and irregular). Specialized connective tissue includes cartilage, bone, adipose tissue, blood and hemopoietic tissue, and lymphatic tissue. Embryonic connective tissue includes mesenchyme and mucous connective tissue.

Connective tissue can be sub-classified into connective tissue proper, specialized connective tissue and embryonic connective tissue. Connective tissue proper consists of loose irregular connective tissue and dense connective tissue (regular and irregular). Specialized connective tissue includes cartilage, bone, adipose tissue, blood and hemopoietic tissue, and lymphatic tissue. Embryonic connective tissue includes mesenchyme and mucous connective tissue.

The histiocyte is a tissue macrophage. Fibroblasts, histiocytes, plasma cells, and mast cells are routinely seen in loose connective tissue. Fibroblasts produce collagen. The fibroblast also produces the ground substance in connective tissue. Myofibroblasts contain properties of both fibroblasts and smooth muscle cells. The histiocyte is a connective tissue macrophage. Plasma cells are derived from B lymphocytes. Mast cells secrete histamine. Mast cells also secrete heparin, SRS-A (slow reacting substance of anaphylaxis, ECF-A (eosinophilic chemotactic factor of anaphylaxis.

Mesenchyme is embryonic connective tissue. It is an undifferentiated tissue found in the embryo. Mucous connective tissue is a type of embryonic connective tissue; it is a subset of mesenchyme. Wharton's jelly is mucous connective tissue. Loose irregular connective tissue is areolar tissue. Dense irregular connective tissue is seen in the dermis. Dense regular connective tissue comprises tendons and ligaments.

Macrophages are mononuclear phagocytes. Many tissues have resident (fixed) macrophages. Fixed macrophages are given a unique name, depending on the tissue that they are located in. Kupffer cells are the hepatic macrophages. Histiocytes are macrophages seen in connective tissue. Dust cells are alveolar macrophage found in the respiratory tract. Langerhans cells are macrophages seen in the skin. Microglia are the central nervous system macrophages.

Brown adipose tissue is multilocular adipose tissue. This is present during fetal development and then decreases after birth. White adipose tissue is unilocular adipose tissue. This type of tissue persists into adulthood.

Mesenchyme is embryonic connective tissue. It is an undifferentiated tissue found in the embryo. Mucous connective tissue is a type of embryonic connective tissue; it is a subset of mesenchyme. Wharton's jelly is mucous connective tissue. Loose irregular connective tissue is areolar tissue. Dense irregular connective tissue is seen in the dermis. Dense regular connective tissue comprises tendons and ligaments.

Microglia are supporting cells in the nervous system. Fibroblasts, histiocytes, plasma cells, and mast cells are routinely seen in loose connective tissue. Fibroblasts produce collagen. The fibroblast also produces the ground substance in connective tissue. The histiocyte is a tissue macrophage. Plasma cells are derived from B lymphocytes. Mast cells secrete histamine. Mast cells also secrete heparin, SRS-A (slow reacting substance of anaphylaxis, ECF-A (eosinophilic chemotactic factor of anaphylaxis.

Plasma cells are derived from B lymphocytes. Fibroblasts, histiocytes, plasma cells, and mast cells are routinely seen in loose connective tissue. Fibroblasts produce collagen. The fibroblast also produces the ground substance in connective tissue. Myofibroblasts contain properties of both fibroblasts and smooth muscle cells. The histiocyte is a connective tissue macrophage. Plasma cells are derived from B lymphocytes. Mast cells secrete histamine. Mast cells also secrete heparin, SRS-A (slow reacting substance of anaphylaxis, ECF-A (eosinophilic chemotactic factor of anaphylaxis.

Mesenchyme is embryonic connective tissue. It is an undifferentiated tissue found in the embryo. Mucous connective tissue is a type of embryonic connective tissue; it is a subset of mesenchyme. Wharton's jelly is mucous connective tissue. Loose irregular connective tissue is areolar tissue. Dense irregular connective tissue is seen in the dermis. Dense regular connective tissue comprises tendons and ligaments.

Within connective tissue, the cells and fibers are embedded in the ground substance. The ground substance is amorphous material. It is composed of proteoglycans and glycosaminoglycans. Hyaluronic acid and chondroitin sulfate are glycosaminoglycans.

A peripheral blood smear would be best visualized with Wright's stain. Hematoxylin and eosin stain is the most commonly used tissue stain for routine histological examination. Lipids are best displayed with a sudan stain. Silver impregnation, such as with a reticular stain, can be used to visualize reticular fibers. Collagen fibers can be differentiated from other fibers by staining with Masson's

Verhoeff Elastic stain stains elastic fibers blue/black. Collagen stains pink/red.

Of the four basic tissue types (epithelium, connective tissue, muscle and nervous tissue), connective tissue is the most diverse. The pubic symphysis, ligaments, areolar tissue, and organ capsules are all composed of connective tissue. The spinal cord is composed of nervous tissue.

Fibroblasts produce collagen. The fibroblast also produces the ground substance in connective tissue. Fibroblasts, histiocytes, plasma cells, and mast cells are routinely seen in loose connective tissue. Fibroblasts produce collagen. The fibroblast also produces the ground substance in connective tissue. Myofibroblasts contain properties of both fibroblasts and smooth muscle cells. The histiocyte is a tissue macrophage. Plasma cells are derived from B lymphocytes. Mast cells secrete histamine. Mast cells also secrete heparin, SRS-A (slow reacting substance of anaphylaxis, ECF-A (eosinophilic chemotactic factor of anaphylaxis.

Connective tissue can be sub-classified into connective tissue proper, specialized connective tissue and embryonic connective tissue. Connective tissue proper consists of loose irregular connective tissue and dense connective tissue (regular and irregular). Specialized connective tissue includes cartilage, bone, adipose tissue, blood and hemopoietic tissue, and lymphatic tissue. Embryonic connective tissue includes mesenchyme and mucous connective tissue.

Connective tissue can be sub-classified into connective tissue proper, specialized connective tissue and embryonic connective tissue. Connective tissue proper consists of loose irregular connective tissue and dense connective tissue (regular and irregular). Specialized connective tissue includes cartilage, bone, adipose tissue, blood and hemopoietic tissue, and lymphatic tissue. Embryonic connective tissue includes mesenchyme and mucous connective tissue.