Freiburger historische Bestände - digital

64

Cunningham Memoirs.

sixty-two subjects, states that in thirty-nine it coincided with the lambda,
in twenty-one subjects it was placed from 1 to 4 mm. in front of this point,
whilst in two subjects it was placed from 2 to 3 mm. behind it.

The results which I obtained are therefore in accordance with those
of Sir William Turner. In twenty-two adult subjects I only found the
fissure once behind the lambda, and three times coinciding with it. In all
the other cases it was placed in front, so that the average index for all the
cases examined was 2*9 in front.

Foulhouze,* IIamy,t Fere^ and Symington § have also studied the position
of this fissure with reference to the cranial wall in the foetus and
child.

In children, Foulhouze in every case found the parietooccipital fissure
well in front of the lambda. The following is a brief summary of his
results :—(1) In children one month old the distance of the fissure from
the lambda was on an average 10*25 mm.; (2) in children four to five
months old, 12 mm. ; (3) in children eighteen months to three years old,
15*4 mm.; (4) in a child five years old, 19mm.; (5) and in a child
thirteen years old, 6 mm.

Hamy considers it to be a characteristic of the full-time foetus to have
the parieto-occipital fissure in front of the lambda. Fere examined a very
large number of foetuses and children. From the fifth month up to the
end of intra-uterine life he gives figures which indicate that the fissure is
placed from 8 to 12mm. in front of the lambda; from birth up to the end
of the first year, from 7 to 18mm. in front of that point; and from the
twenty-eighth month up to the twelfth year, from 0 mm. to 10 mm. in front
of the lambda. Symington examined the fissure in its relations to the

* Recherches sur les Rapports Anatoniiques du cerveau avec la voute du crane chez les
enfants. Paris, 1876.

f " Contribution a l'etude du developpement des lobes cerebraux des primates," Revue
d'Anthropologic.

\ Amongst a number of important papers published by I1 ere, we may specially mention, as
bearing particularly on the present research, " Sur le developpement du cerveau considere dans
ses rapports avec le crane," Revue d'Anthr., 1879. It is from this Paper that the figures quoted
above are taken.

§ Topographical Anatomy of the Child. Edinburgh, 1887.