Question

Label the photomicrograph of spongy bone. Trabecula of spongy bone Periosteum Marrow cavity Reset Zoom

Answer 1

1) Trabeculae is spongy bone is shown in the photomicrograph at the top left corner.

Trabeculae are thin columns and plates of bone that create a spongy structure in a cancellous bone. It is the inner tissue of the skeletal bone and is an open cell porous network.

2) Periosteum is the top most layer shown in the micrograph or it is the structure labelled at top right corner.

The outsides of all the bones (here, in spongy bone) are covered with a layer of irregular dense connective tissue proper called the periosteum.

3) The marrow cavity is shown at the bottom.

Bone marrow fills the cavities of the bones and occupies the spaces in spongy bone. The medullary cavity is the hollow part of the bone that contains bone marrow.