Cancellous or more commonly known as the spongy bone is a porous form of bone present in animals. It is located mostly towards the end of the long bones surrounded by compact bones. It is more flexible in nature but is softer and much weaker than the compact bone. The spongy structure of the bone is attributed to the trabeculae, the lattice-like matrix found inside it. It is the site of storage of red bone marrow, which is formed by condensing of the trabecular matrix around the blood vessels. This also makes it highly vascular. Structurally, the spongy bone is made of up of cells known as osteocytes, that sit in small cavities known as lacunae. It is present mostly in the joints and provides flexibility to the skeleton. Due to its spongy nature, it absorbs shock and helps to make the bones stronger.

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Chapter 19, Problem 1A

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Cancellous or more commonly known as the spongy bone is a porous form of bone present in animals. It is located mostly towards the end of the long bones surrounded by compact bones. It is more flexible in nature but is softer and much weaker than the compact bone.

The spongy structure of the bone is attributed to the trabeculae, the lattice-like matrix found inside it. It is the site of storage of red bone marrow, which is formed by condensing of the trabecular matrix around the blood vessels. This also makes it highly vascular. Structurally, the spongy bone is made of up of cells known as osteocytes, that sit in small cavities known as lacunae. It is present mostly in the joints and provides flexibility to the skeleton. Due to its spongy nature, it absorbs shock and helps to make the bones stronger.

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