Description of a new craniometer and of certain age changes in the anthropoid skull / by Arthur Keith.

  • Keith, Arthur, Sir, 1866-1955.
Date:
[1910]
Catalogue details

Licence: In copyright

Credit: Description of a new craniometer and of certain age changes in the anthropoid skull / by Arthur Keith. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    exactly in the sub-cerebral plane; the basion is marked ; that is, it is 80 mm. forwards in the a.p. plane and 32 below the sub-cerebral plane. If necessary, the position in the lateral plane may also be added. Note is also made of the plane of the occipital condyles. In fig. 3 the low position of the basion and the shallow mastoid are indicated with an exactitude which cannot be obtained by any other metliod. Fig. 3.—Drawing of a Bushman’s skull (1624 R.C.S. Museum) made from cranionietric data. The upper figure, shown at the chief points of the skull, gives the position of the point in the antero-posterior plane; the lower one in the vertical plane. The three vertical lines are drawn through the anterior end of the cribriform plate (A A) ; through the anterior pole (B B), at level of the ophryon ; through anterior pole (0 C) but at right angles to the ethmoidal plane. The orienting rod is represented by the bar of black lines—the lower margin of the rod—which is 5 mm. thick, representing the sub-cerebral plane. The rod is thrust within the skull to a distance of 140 mm. The remarkable protuberant median frontal boss of the Bushman is a well- known character, but it is only by such a method as this that its nature can be ascertained. The forehead projects far in front of the eyebrows. In nearly all human races the glabella falls about 5 mm. above the sub- cerebral plane, but in the Bushman it falls below it. The cribriform plate is 2 or 3 millimetres below this plane as a rule in European skulls, but in the particular Bushman investigated it falls over 20 mm. below it. We are VOL. XLIV. (third see. VOL. V.)—APRIL 1910. 17