The periosteum is best described as which type of connective tissue?

The periosteum is best described as which type of connective tissue?

• A. Dense regular connective tissue
• B. Dense irregular connective tissue
• C. Elastic connective tissue
• D. Loose connective tissue

Answer: (B)

Collagen fiber orientation drives how a connective tissue resists stress. The periosteum has an outer fibrous layer made of dense irregular connective tissue, with collagen fibers arranged in multiple directions. This irregular arrangement lets the periosteum withstand forces coming from any direction, which is essential for guarding and nourishing bone. Dense regular connective tissue, with parallel collagen fibers, is typical of tendons and ligaments and isn’t suited to multi-directional forces like those acting on bone. Elastic connective tissue is rich in elastic fibers and is found where stretch is key; the periosteum isn’t primarily about elasticity. Loose connective tissue is less dense and provides packing and insulation rather than a tough, protective covering.

Collagen fiber orientation drives how a connective tissue resists stress. The periosteum has an outer fibrous layer made of dense irregular connective tissue, with collagen fibers arranged in multiple directions. This irregular arrangement lets the periosteum withstand forces coming from any direction, which is essential for guarding and nourishing bone.

Dense regular connective tissue, with parallel collagen fibers, is typical of tendons and ligaments and isn’t suited to multi-directional forces like those acting on bone. Elastic connective tissue is rich in elastic fibers and is found where stretch is key; the periosteum isn’t primarily about elasticity. Loose connective tissue is less dense and provides packing and insulation rather than a tough, protective covering.