. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 552 OSCAR E. SCHOTTE AND CHARLES B. SMITH of the bone. Seven clays after amputation 13 of the 15 cases studied showed a well defined dermal pad. Our observations of dermal healing concur with the previous descriptions of Arey (of>. cit.) and Rohbins (op. cit.) : new blood vessels with at first indistinct walls accompanying the migrating fibroblasts become evident. Also, the first new collagenous fibers are seen at seven days in preparations with Mallory stain; consequently, the sub-dermal tissues become increasingly dense
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 552 OSCAR E. SCHOTTE AND CHARLES B. SMITH of the bone. Seven clays after amputation 13 of the 15 cases studied showed a well defined dermal pad. Our observations of dermal healing concur with the previous descriptions of Arey (of>. cit.) and Rohbins (op. cit.) : new blood vessels with at first indistinct walls accompanying the migrating fibroblasts become evident. Also, the first new collagenous fibers are seen at seven days in preparations with Mallory stain; consequently, the sub-dermal tissues become increasingly dense and fibrous until about two weeks after amputation when a characteristic dermal pad is found sur- rounding the end of the bone and the newly formed callus. v •» ^A v I *••£*•/,'• Pir >fl mf. FIGURE 5. The photomicrograph of a longitudinal section from a digit (Case MCS 1, R-2-III) fixed six days after amputation shows: (a) the thick epithelial covering; (b) the connective tissue fihrohlastic invasion into the amputation area resulting in a sizeable cap consisting of numerous layers of connective tissues; (c) the bursa-like cavity between this dermis and the end of the bone; (d) the extensive proliferation of periosteal elements with a large mass of cartilage cells on both sides of the bone (125 X). Reconstruction of bone tissue is also seen for the first time at three days, and our observations of the early stages of repair agree with the descriptions of McLean and Urist (of>. cit.). The trauma of the operation and particularly the disturbance of vascular supply results in the death of osteocytes for varying distances from the distal end of the cut bone toward its proximal region. Empty bone lacunae such as shown in Figures 4 and 5 are represented under higher magnification in Figure 6 (Case MCS 100, R-2-III), fixed three days after amputation. The empty lacunae occupy most of the bone shaft; however, near the periosteum surviving osteocytes are discernible.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
