MICROANATOMY

Detailed explanation-1: -compact bone, also called cortical bone, dense bone in which the bony matrix is solidly filled with organic ground substance and inorganic salts, leaving only tiny spaces (lacunae) that contain the osteocytes, or bone cells.

Detailed explanation-2: -What are examples of flat bones? This type of bone is solid throughout except for the central canals and lacunae. Spongy bone would primarily be found where in a bone?

Detailed explanation-3: -Bone lacunae are small, spindle-shaped spaces (appearing dark in this image), each containing an osteocyte that is left behind by osteoblasts during the process of remodelling.

Detailed explanation-4: -Compact bone consists of closely packed osteons or haversian systems. The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix. Between the rings of matrix, the bone cells (osteocytes) are located in spaces called lacunae.

Detailed explanation-5: -Spongy (Cancellous) Bone. Like compact bone, spongy bone, also known as cancellous bone, contains osteocytes housed in lacunae, but they are not arranged in concentric circles.