6. Osteonic canals, also known as Haversian and Central canals, contain ______________________________.

Question

BlackTom AI · Accepted Answer

To tackle the question properly, I will go through each option in turn and explain what it is and why it does or does not fit with the function of osteonic (Haversian/Central) canals.
Option 1: the epiphyseal plate. The epiphyseal plate, or growth plate, is the area of growing tissue near the ends of long bones in children and adolescents. It is not a component of the osteonic canal system, and it does not contain the vascular channels responsible for nourishing bone tissue. This makes this choice incorrect for describing what osteonic canals contain.
Option 2: osteocytes. Osteocytes are mature bone cells embedded in lacunae within the bone matrix. They reside in lacunae and extend processes through canaliculi to communicate with other osteocytes. While osteocytes are part of bone tissue, they do not reside within the osteonic canals themselves, nor do they constitute the vascular content of those canals. Thus this option is not accurate for what osteonic canals contain.
Option 3: articular cartilage. Articular cartilage covers the ends of bones at joints and provides a smooth surface for articulation. It is not a feature of the osteonic canal system and does not participate in the vascular network within the bone. Therefore, this statement is not correct in the context of osteonic canal contents.
Option 4: blood vessels. The osteonic (Haversian) canal houses blood vessels and nerve fibers that run longitudinally through the bone. These vessels supply nutrients and remove waste from bone cells, forming a core component of the vascular system within compact bone. This aligns precisely with the known anatomy of Haversian canals, so this option correctly describes what these canals contain.
Option 5: lacunae. Lacunae are small chambers within the bone matrix that house osteocytes. They are connected by canaliculi but are not the contents of the Haversian canal itself. While lacunae are part of the bone’s microarchitecture, they do not reside inside the osteonic canal, making this option incorrect for describing canal contents.
In summary, the statements about epiphyseal plates, osteocytes, articular cartilage, and lacunae each describe distinct bone features or cell locations that are not what the osteonic canal contains. The description that matches the histology and function of the osteonic canal is the presence of blood vessels (and nerve fibers), which fit the role of supplying nutrients and maintaining bone tissue.

6. Osteonic canals, also known as Haversian and Central canals, contain ______________________________.单项选择题

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