AEMCA Practice Exam

What are osteons?

1. Muscle fibers

2. Joint cavities

3. Formation of osteocytes around a Haversian canal

4. Connective tissues of the skin

The correct answer is: Formation of osteocytes around a Haversian canal

Osteons are structural units of compact bone, and they consist of concentric layers of mineralized matrix surrounding a central Haversian canal, which contains blood vessels and nerves. The formation of osteocytes, which are mature bone cells, occurs around these Haversian canals as the bone grows and develops. Osteocytes are embedded within small spaces called lacunae and extend their processes through tiny channels known as canaliculi, allowing for communication and nutrient exchange between the cells and the Haversian canal. The correct answer highlights the relationship between osteocytes and the Haversian canal, emphasizing the organized structure that contributes to the strength and functionality of bone tissue. This specialization is essential for maintaining the health and density of bones, facilitating their role in support and movement. Understanding the role of osteons in bone anatomy is crucial for fields such as anatomy, physiology, and medicine, where bone health is a key concern.