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Dense Regular CT

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Cells

Fibroblasts are the predominant cells in dense connective tissue. Fibroblasts are responsible for synthesizing collagen fibers. In dense regular connective tissue, the collagen fibers are densely packed. As a result, the purple-stained fibrocytes are squished between the cells.   

Fibers

Collagen fibers are the main structural component of dense regular connective tissue. These pink-stained fibers are arranged all in the same orientation, creating a wave-like feeling to this tissue.  Elastin fibers may also be present in dense connective tissue. 

Matrix

 The extracellular matrix of dense connective tissue contains a gel-like ground substance. It is composed of glycoproteins, proteoglycans, and water. It can barely be seen here due to the denseness of the tissue. This ground substance fills the spaces between cells and fibers, providing support and maintaining the structural organization of the tissue. 

Functions

The main function of dense regular connective tissue is to provide strength. It also resists tensile forces in one primary direction. Its parallel arrangement of collagen fibers allows it to efficiently transmit and withstand pulling forces along a single axis. This makes it particularly well-suited for structures subjected to consistent directional stress, such as tendons and ligaments.

Locations

Dense regular connective tissue forms tendons, which attach skeletal (not cardiac or smooth) muscles to bones. Ligaments are bands of dense regular connective tissue. They connect bones to other bones. Ligaments provide stability to joints and prevent excessive movement. Examples include the anterior cruciate ligament (ACL) and the medial collateral ligament (MCL) in the knee joint.

Easily Confused With

Smooth muscle

Photomicrograph of esophagus tissue, stained pink to highlight collagen fibers linearly arranged in a dense regular pattern. Scattered, small, dark elliptical nuclei (fibroblasts) run parallel to the fibers. Magnification unknown. Field of view is filled with fibrous tissue. The image is lit evenly.
Figure 1: Dense regular connective tissue of the esophagus. Pink collagen fibers with scattered dark nuclei. Microscopic view.
Photomicrograph of dense irregular connective tissue of plantar skin, intensely stained with hematoxylin and eosin (H&E). Thick bundles of eosinophilic collagen fibers are arranged in a non-parallel, interwoven pattern, dominating the field. Scattered elongated nuclei are seen within the collagen matrix, representing fibroblasts. The H&E staining highlights the protein-rich collagen as pink and the cell nuclei as darker shades.
Figure 2: Microscopic view of dense regular connective tissue, part of the plantar skin. Pink collagen fibers with other cells.

Figure 1: Esophagus and stomach, H&E, 40X Slide 155
Figure 2: Thick skin, sole of foot, H&E, 40X Slide 106
All by University of Michigan Histology, licensed under CC BY-NC-SA 3.0.

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General Information
Adipose CT
Areolar CT
Reticular CT
Dense Regular CT
Dense Irregular CT
Elastic CT
Bone CT
Hyaline Cartilage CT
Elastic Cartilage CT
Fibrocartilage CT

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