Freiburger historische Bestände - digital

154

Cunningham Memoirs.

Infants in the first year of life.

Four heads of children in the first year of life have been examined with
the view of ascertaining the position of the anterior limbs of the Sylvian
fissure in relation to the cranial wall. Two of these are figured in Plate v.
(figs. 4 and 5).

1. Female child, one year old (fig. 4).—Both ascending and horizontal
limbs on the outer face of the hemisphere. The ascending limb is
crossed at its base by the coronal line. Its upper two-thirds lie in front
of the coronal suture. The horizontal limb is very short, and is covered
by the coronal bar of bone. It lies high above the level of the great
wing of the sphenoid.

2. Female child, six months old (fig. 5).—The horizontal limb is placed
on the orbital surface of the frontal lobe. The ascending limb at its base is
5 mm. behind the coronal line. From this it extends upwards and forwards,
and is crossed by the coronal line at the junction of its upper and middle
thirds. The point at which it is crossed by the coronal line is 16 mm.
above the level of the pterion.

3. Male child, six months old.—The two anterior limbs are arranged in the
form of a Y. The stem of the Y is immediately subjacent to the coronal
suture, whilst both limbs are in front of it.

4. Female child, three months old.—The two anterior limbs are arranged
in the form of a Y. The stem of the Y and the ascending limb are immediately
subjacent to the coronal line, whilst the horizontal limb stretches
forward in front of it at a considerable height above the upper border of
the great wing of the sphenoid.

Fidl-time foetuses.

Of these I have examined four, of which one is figured in Plate v. (fig. 3).
Owing to the fact that at this stage the Sylvian fossa is not completely closed
in, the position of the anterior limbs of the Sylvian fissure cannot be determined
with the same precision as in the later periods of life.