A1 and lamina muscularis mucosae Fig. A2 as the lamina propria Fig. A3 , as the tela submucosa Fig. A4 , and as an organ envelope, the tunica adventitia Fig. Skip to main content. This service is more advanced with JavaScript available. Advertisement Hide. Lipid is preserved and stained black when the tissue is prepared using osmium tetroxide as a fixative. Slide 49 Esophagus. Leukocytes are white blood cells that are readily found in connective tissue.
Lymphocytes similar in size to red blood cells are the most common connective tissue leukocyte. Aggregates of lymphocytes are often found associated with the mucosal epithelium of the GI tract, such as this slide of the esophagus.
They have a small amount of slightly basophilic cytoplasm and a large, darkly stained nucleus because of condensed chromatin. Use Slide 51 pyloric stomach to compare lymphocytes no visible cytoplasm to plasma cells which contain abundant cytoplasm. Slide 80 Pancreas. Observe the eosinophils surrounding the large duct in the center of this slide. These cells are another type of leukocyte that are identified by their bilobed nucleus and refractile specific granules that are stained by eosin.
Connective tissue can be classified as either connective tissue proper or specialized connective tissue. Connective tissue proper includes: loose connective tissue also called areolar and dense irregular connective tissue. Specialized connective tissue types include: dense regular connective tissue, cartilage, bone, adipose tissue, blood, and hematopoietic tissue. The majority of specialized connective tissues will be studied in future laboratories. Slide 13 Trachea. Loose connective tissue areolar is located under the thick eosinophilic basement membrane of the respiratory epithelium in the trachea.
The most numerous cell types are fibroblasts. In addition, other fibers such as collagen, elastic, and reticular fibers are present. Its matrix appears transparent or glassy when viewed under a microscope.
It provides strong support while providing pads for shock absorption. It is a major part of the embryonic skeleton, the costal cartilages of the ribs, and the cartilage of the nose, trachea, and larynx. This is a blend of hyaline cartilage and dense regular connective tissue. Because it is compressible and resists tension well, fibrocartilage is found where strong support and the ability to withstand heavy pressure are required.
It is found in the intervertebral discs of the bony vertebrae and knee meniscus. Bone tissue is also called the osseous tissue. The osseous tissue is relatively hard and lightweight in nature. It is mostly formed of calcium phosphate in the chemical arrangement termed calcium hydroxyapatite, which gives bones their rigidity.
It has relatively high compressive strength, but poor tensile strength, and very low shear stress strength. The hard outer layer of bones is composed of compact bone tissue, so-called due to its minimal gaps and spaces.
Filling the interior of the bone is the trabecular bone tissue an open cell porous network also called cancellous or spongy bone , which is composed of a network of rod and plate-like elements that make the overall organ lighter and allow room for blood vessels and marrow.
This is considered a specialized form of connective tissue. Blood is a bodily fluid in animals that delivers necessary substances, such as nutrients and oxygen, to the cells and transports metabolic waste products away from those same cells.
It is an atypical connective tissue since it does not bind, connect, or network with any body cells. It is made up of blood cells and is surrounded by a nonliving fluid called plasma. Privacy Policy. Skip to main content. Organization at the Tissue Level. Search for:. Connective Tissue. Learning Objectives Describe the main characteristics and functions of connective tissue. Loose connective tissue has some fibroblasts, although macrophages are present as well. Collagen fibers are relatively wide and stain a light pink, while elastic fibers are thin and stain dark blue to black.
The space between the formed elements of the tissue is filled with the matrix. The material in the connective tissue gives it a loose consistency similar to a cotton ball that has been pulled apart. Loose connective tissue is found around every blood vessel, helping to keep the vessel in place.
The tissue is also found around and between most body organs. In summary, areolar tissue is tough, yet flexible, and comprises membranes. Fibrous connective tissues contain large amounts of collagen fibers and few cells or matrix material. The fibers can be arranged irregularly or regularly with the strands lined up in parallel. Irregularly-arranged fibrous connective tissues are found in areas of the body where stress occurs from all directions, such as the dermis of the skin.
Regular fibrous connective tissue is found in tendons which connect muscles to bones and ligaments which connect bones to bones. Cartilage is a connective tissue. The cells, called chondrocytes mature cartilage cells , make the matrix and fibers of the tissue.
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