What is the medullary cavity?

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Prepare for the VetSkill Level 3 Diploma VN02 – Diagnostic Principles Test. Engage with multiple-choice questions, hints, and explanations. Achieve your certification!

Multiple Choice

What is the medullary cavity?

Explanation:
The medullary cavity is the central hollow inside a bone. It runs through the shaft of long bones and is surrounded by the dense outer bone (cortical bone). This cavity is lined by the endosteum and houses bone marrow, which is essential for producing blood cells (red marrow in children, largely yellow marrow in adults). It is not the outer layer of bone—that would be the cortical bone. It is not the space inside a joint—that space is the synovial cavity. It isn’t a cavity within the periosteum, which is a membrane covering the bone’s exterior. So the central hollow within a bone best fits the medullary cavity.

The medullary cavity is the central hollow inside a bone. It runs through the shaft of long bones and is surrounded by the dense outer bone (cortical bone). This cavity is lined by the endosteum and houses bone marrow, which is essential for producing blood cells (red marrow in children, largely yellow marrow in adults). It is not the outer layer of bone—that would be the cortical bone. It is not the space inside a joint—that space is the synovial cavity. It isn’t a cavity within the periosteum, which is a membrane covering the bone’s exterior. So the central hollow within a bone best fits the medullary cavity.

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