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Bone tissue is generally classified as compact or spongy bone. Compact bone forms the hard outer layer of bone while spongy bone forms the porous interior. Spongy bone, also known as cancellous bone, is composed of a lattice-like arrangement of osteocytes known as trabeculae.
Spongy bone is usually located at the ends of the long bones (the epiphyses), with the harder compact bone surrounding it. It is also found inside the vertebrae, in the ribs, in the skull and in the bones of the joints. Spongy bone is softer and weaker than compact bone, but is also more flexible.
Like compact bone, spongy bone, also known as cancellous bone, contains osteocytes housed in lacunae, but they are not arranged in concentric circles. Instead, the lacunae and osteocytes are found in a lattice-like network of matrix spikes called trabeculae (singular = trabecula) ( Figure 6.3.8 ).
Spongy bone, also known as cancellous or trabecular bone, is a lighter, less dense type of bone tissue found within the interior of bones. It has a porous, honeycomb-like structure composed of trabeculae, which are thin rods and plates of bone that form a meshwork.
Both the epiphyses and metaphyses have a thin cortical layer of compact bone that is filled with a porous bone arrangement called spongy bone. The spaces within the spongy bone are filled with red bone marrow containing the stem cells for blood cell production (the process of hematopoesis).
Cancellous bone, light, porous bone enclosing numerous large spaces that give a honeycombed or spongy appearance. The bone matrix, or framework, is organized into a three-dimensional latticework of bony processes, called trabeculae, arranged along lines of stress.
Spongy bone location. Where is spongy bone found? 20% of the human skeleton is composed of cancellous bone, which provides mechanical support as well as mobility without the load on compact bone. Compact bone functions to provide strength and protection to bones.
Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone’s overall function. Compact bone is dense so that it can withstand compressive forces, while spongy (cancellous) bone has open spaces and supports shifts in weight distribution.
Like compact bone, spongy bone, also known as cancellous bone, contains osteocytes housed in lacunae, but they are not arranged in concentric circles. Instead, the lacunae and osteocytes are found in a lattice-like network of matrix spikes called trabeculae (singular = trabecula) ( Figure 24.7 ).
Spongy bone is on the interior of a bone and consists of slender fibers and lamellae—layers of bony tissue—that join to form a reticular structure. Spongy bone is supplied by fewer and larger vessels than compact bone. These vessels perforate the outer compact layer and are distributed into the spongy portion of bone, which is filled with marrow.