General characteristics of dense fibrous tissue
Dense fibrous connective tissue is a type of proper connective tissue where the extracellular matrix is in a solid or gel-like state and significantly predominates over cells. The main criterion for "density" is that fibers (predominantly collagen) are gathered into thick bundles, while the amorphous component and cellular elements are present in minimal amounts.
The primary task of this tissue is to perform mechanical and supportive functions, i.e., ensuring maximum tensile strength.
Classification by fiber orientation
The principle of dividing dense fibrous connective tissue is based on the direction of fiber bundles, which directly depends on the vector of the applied functional load:
- Dense irregular connective tissue: fiber bundles are directed in various directions (multidirectional orientation), intertwining to form a strong three-dimensional network.
- Dense regular connective tissue: fiber bundles have a strictly ordered arrangement and run parallel to each other in one direction.
Varieties of dense regular tissue
Dense regular connective tissue is additionally subdivided according to the predominance of certain types of fibers in its composition:
- Collagen type: contains exclusively collagen fibers. Tendons, fasciae, organ capsules, and most ligaments are built from it.
- Elastic type: includes both collagen and elastic fibers. Due to its high elastin content, it has a characteristic yellowish tint (a striking example is the ligamentum nuchae).
Options for cambium localization in tissues
In various tissues, stem and germinative (cambial) cells can be located differently:
- Localized cambium: cells are gathered in a specific zone (for example, the basal layer of the skin epidermis or the neck of glands in the stomach).
- Diffuse cambium: cambial elements are not localized in one place, but scattered throughout the volume of the tissue. This is characteristic of connective tissues and the epithelium of endocrine glands (e.g., the pituitary and thyroid glands).
- External cambium: precursors are located outside the structure itself. For example, cartilage cell precursors (chondroblasts) lie in the surrounding perichondrium, which consists of fibrous connective tissue.
Dense tissue is the "ropes" of the body: if the fibers intertwine like a web — irregular, if they march in strict parallel — regular (collagen or elastic).
Class and exam questions
What is the main criterion for the "density" of fibrous connective tissue?
The main criterion is that fibers (mainly collagen) are combined into powerful bundles and predominate over cellular elements and the amorphous component.
What is the difference between dense regular and irregular tissue?
In irregular tissue, fiber bundles run in different directions, forming a network. In regular tissue, fibers are ordered and oriented strictly parallel.
Where is the cambium located in the external type?
In the external type, cambial elements are located outside the tissue itself, like, for example, chondroblasts in the perichondrium surrounding cartilage.
What else to study on this topic
- Age-related changes in dense fibrous connective tissue
- Regeneration processes in fibrous connective tissues
- Sources of connective tissue development in embryogenesis
- Cellular composition and features of the extracellular matrix
- Structure and functions of loose fibrous connective tissue
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