Bone and joint studies. 1 / by Leonard W. Ely, and John Francis Cowan.

  • Ely, Leonard W.
Date:
1916
Catalogue details

Licence: Public Domain Mark

Credit: Bone and joint studies. 1 / by Leonard W. Ely, and John Francis Cowan. Source: Wellcome Collection.

    139/144 (page 137)
    HistoLocy.—The pulpy area in the clavicle consists of fatty mar- row, from which the bone has practically disappeared. The marrow near the joint is normal lymphoid, and here the trabeculae are normal in size and in number. } XVIII, too. Normal joint. Deep red marrow throughout both bones. In the clavicle at a distance of about 1 cm. from the joint, the bone trabeculae practically cease, and the whole shaft is filled with a pulp-like mass. The same condition to a lesser extent is present in the sternum, but nearer the joint. The bone cuts very easily. The speci- men decalcified in forty-eight hours. HistoLocy.—Clavicle. The marrow shows a very early stage of tubercle formation. Small typical tubercles are scattered here and there, some of them beginning to coalesce. They are located in otherwise ap- parently normal lymphoid marrow near the joint, not in the pulpy area farther away, described above. The bone trabeculae in their vicinity are normal, the joint also. The pulpy areas consist of lymphoid and of fatty marrow, from which the trabeculae have almost disappeared. The marrow contains perhaps a superabundance of endothelial leucocytes. The sternum also contains a very small focus directly under the cartil- age, in the lymphoid marrow—aggregated tubercles, with beginning cheesy degeneration,—and one some distance from the joint, also in lymphoid marrow. The marrow is exclusively lymphoid, except for a small area of fatty marrow at a distance from the joint. Slides stained by the Zieh] method show tubercle bacilli. XVIII, 103. Red marrow predominates in both bones, but some yellow is present. The cartilage over the sternum is thin and irregular. HistoLocy.—The thin and irregular sternal cartilage is manifest. The marrow directly beneath it is engorged with blood, and in places is pushing up “fingers” into the cartilage. XVIII, 112. The joint is normal. The marrow in the sternum is red, in the clavicle red and yellow. From one area in the clavicle, about 5 mm. in diameter, the bone trabeculae have almost disappeared, and the marrow is so much pulp. HistoLocy.—The area of pulp is seen to consist of yellow mar- row, in which are a very few small bone trabeculae. On one side of the section the layer of cortical bone is extremely thin; in fact for a short distance it ceases entirely. The periosteum over this thin cortical bone is normal near the joint, but becomes much thicker farther away, so as to form a thick mass of fibrous tissue. Many cartilage cells are seen in the periosteum, so that in places it is fibro-cartilage.