Original
Article About Dexters
"The
Significance of an Achondroplasia-Like Condition Met With in Cattle"
Photographic Plates
by F.A.E. Crew
in Proceedings of the Royal Society of London,
volume 95, 1923, pages 228-255.
Between Pages 254 and 255
Photographic Plates
PLATE 12
Fig. 1 - Six to seven months’ “bull-dog” foetus, showing ventral hernia.
Black ♂.
Fig. 2 - Five months’ foetus, showing wrinkling of the skin. Black ♂.
Fig. 3 - Four to five months’ foetus; hydrocephalus, anasarca, incomplete
abdominal wall. Black ♂
Fig. 4 - Nearly full-time foetus. No hernia. Black ♀.
PLATE 13
Figs. 1 and 2 - The skull of a normal calf.
Figs. 3 and 4 - The skull of a “bull-dog” calf of the same age.
 PLATE
14.
Fig. 1 - Radiograph of forelimb of “bull-dog” calf.
Fig. 2 - Radiograph of hind-limb.
Fig. 3 - Microphotograph of section through the end of a long bone, showing
complete failure of reconstruction of cancellous bone. x22.
Fig. 4 - Microphotograph of the epiphysial line, showing attempt at column
formation. x110.
Fig. 5 - Microphotograph of the area of calcified cartilage, showing failure
of absorption of same and absence of reconstruction of cancellous tissue.
Osteoblasts are present but fail to deposit osteoblastic bone. The epiphysis
is normal. There is no sign of any cell proliferation and none of any
attempt to form the serrated zone. The ossifying junction is occupied by a
thick mass of osteoid tissue, which separates the cartilage from the
diaphysis, and this area is non-vascular. The condition is one of abnormal
endochondral ossification. x110.
PLATE 15
Fig. 1 - Thyroid of “bull-dog” calf, showing normal structure. x110.
Figs. 2 and 3 - The same, showing hyperplasia. x110.
Figs. 4, 5 and 6 - The same, showing involution. x100.
Fig. 7 - The adrenal from a “bull-dog” foetus, showing the areas of
cartilaginous bone-formation. x85.
Fig. 8 - The pituitary of a “bull-dog” foetus, showing normal structure.
x15.
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