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| 0301 |
Explorations in Turkestan : Expedition of 1904 : vol.2 |
Captions
| [Figure] 495~a |
Sagittal section of joint surface of condylus lateralis tibiae from Anau I. |
| [Figure] 495~b |
Same section from a European tibia. |
| [Figure] 495~c |
Sagittal section through lower joint-section of left tibia through facet, Anau I; thick line marks cartilage cover. |
| [Figure] 495~d |
Same section through European tibia. |
| [Figure] 495~e |
Sagittal section through medial edge of trochlea and medial neck-swelling. |
| [Figure] 495~f |
Sagittal section through trochlea and lateral neck-swelling. |
Citation Information
OCR Text
enemism, and he gives a figure of such a tibia (1888, p. 506). A measurement
on this reduced picture can, of course, give no exact result, still the corresponding
index seems to amount to 3.5. The two Wedda tibiae Nos. 178 and 179, on plate
LXXXII of the frequently mentioned work of Sarasin, yield indices of 3.5 and 4.7.
In contrast to these values the curvature of the Anau tibia must be considered
moderate.
A further character of great importance exists on the anterior edge of the
lower joint-surface, where this
goes over into the anterior sur-
face of the bone. In European
shin bones a sharp edge usually
separates the joint-surface from
the anterior surface of the tibia.
In our tibia, on the other hand,
the joint-surface extends in one
place over the just-mentioned
edge, and makes on the anterior
surface of the tibia a small facet
whose condition shows clearly
that it was originally covered
with cartilage (plate 95, fig. 3, a).
At this point the edge, instead
of being sharp, is rounded softly
off. On the right tibia the facet
is less large, but it is still clearly
present. The difference in the
form of the joint-surface from
that of a European is best recog-
nized in a sagittal section that
was drawn with the aid of a lead
wire through the place of the
facet (fig. 495, c and d).
This characteristic has been
found among different lower
races, and also in anthropoids; thus by Thomson (1890, p. 213) in the gorilla,
orang, and in the Weddas; by Martin in the Fuegians (1894, p. 198) and Senoi
(1905, p. 635).
The occurrence was already rightly interpreted by its first observer, Thomson
(1889, p. 624), who sought the cause of this facet in frequent strong dorsal flexure
of the foot which occurs especially in a squatting position. Let us look a little
more closely into the mechanism of the object before us.
As one can see in a skeleton, in strong dorsal flexure of the foot the talus
presses with the anterior upper surface of its neck on the forward edge of the joint-
surface of the tibia. In this action it is especially the medial and lateral edges
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