I focused on the hollow center, the region analogous to the marrow cavity in a long bone.

The yellow marrow has fatty connective tissue and is found in the marrow cavity.

The colour of the marrow cavity does not differ from the colour of the external surface of the bone.

As it breaks away, osteoclasts enter into the bone and develop trabeculae and the marrow cavity on the inside.

Dr. Schweitzer and colleagues noticed unusual tissue fragments lining the marrow cavity inside the dense bone.

A little closer to the marrow cavity, chondrocytes multiply and arrange themselves into longitudinal columns of flattened lacunae.

This converts each column into a longitudinal channel, which is immediately invaded by blood vessels and marrow from the marrow cavity.

The bone tools found, according to Bird, were made from sloth bone because there bone used showed no evidence of marrow cavities.

This region, farthest from the marrow cavity, consists of typical hyaline cartilage that as yet shows no sign of transforming into bone.

Bone marrow cavities may be enlarged and the cortical bone may be thinned.

It's a middle tubular part composed of compact bone which surrounds a central marrow cavity which contains red or yellow marrow.

These tiny perforations allow stem cells to escape from the marrow cavity, starting the formation and growth of repair tissue that is similar to the original cartilage.

Once the needle is in the marrow cavity, a syringe is attached and used to aspirate ("suck out") liquid bone marrow.

The bone marrow cavity is important for the proper development of the immune system, and houses important stem cells for maintenance of the immune system.

Bone pain, joint pain (caused by the spread of "blast" cells to the surface of the bone or into the joint from the marrow cavity)

Turk, et al. (in the monograph Moussterian Bone Flute, p. 160) wrote that "the marrow cavity is basically cleaned of spongiose.

Counterconditioning: When Mason leaps on the light, spray her without warning and then give her a bone whose marrow cavity is stuffed with peanut butter or cheese spread.

Besides the fresh-bone fractures present on many bones, "[processing] for marrow is also documented by the presence of scrape marks in the marrow cavity on two fragments."

Then, with a twisting motion of clinician's hand and wrist, the needle is advanced through the bony cortex (the hard outer layer of the bone) and into the marrow cavity.

When she first examined the marrow cavities of the dinosaur leg bones, Dr. Schweitzer said, "I knew right away there was special bone tissue, and it had all the characteristics of medullary bone tissue."

Occasionally he would pause in his crunching, pin the bone to the floor with one paw while he thrust his tongue into the marrow cavity, licking the gray substance with relish before cracking another section and repeating the procedure.

The presence of endosteally derived bone tissues lining the interior marrow cavities of portions of the Tyrannosaurus rex specimen's hind limb suggested that T. rex used similar reproductive strategies, and revealed the specimen to be female.

Mr. Horner said that microscopic examination of a thin slice through the dinosaur bone showed that although its outer layers were mineralized the bone itself, brown in color, remained more or less intact in the interior of the marrow cavity.

Since the normal, pre-estradiol treatment endosteal margin could still be histologically identified on these specimens, specimens were evaluated with quantitative histomorphometry by first measuring the old, normal marrow area and then measuring the small marrow cavity areas present at time of harvest.

In the March 2005 Science magazine, Mary Higby Schweitzer of North Carolina State University and colleagues announced the recovery of soft tissue from the marrow cavity of a fossilized leg bone, from a 68 million-year-old Tyrannosaurus.