Universitätsbibliothek HeidelbergUniversitätsbibliothek Heidelberg
Overview
Facsimile
0.5
1 cm
facsimile
Scroll
OCR fulltext
( 16 )

The frontal bone at birth consists always of two portions.
The superciliary arches, and orbitar plates, are dis-
tinctly formed, and sometimes the frontal sinuses.

When performing the operation of trepanning, the situa-
tion of the frontal sinuses, and the longitudinal sinus of
the dura mater, should be remembered, and cautiously
avoided.

Substances have been forced immediately over the inter-
nal angle of the orbit, some way into the skull, and
never produced any symptom common to injuries of
the brain. When removed, it has been ascertained
that these substances were in the frontal sinus.

OSSA PARIETALIA.
Ossa bregmatis. Ossa syiicipitis. Ossa verticalia. Ossa verticis.

The parietal bones are situated one on each side of the su-
perior part of the cranium, and are considerably convex and
somewhat quadrangular. Each bone is distinguished into an
external and an internal surface, and four atigles, viz. the fron-
tal, sphenoidal, called also, the spinous process; the occipital,
and mastoid.

Eminences and cavities. A semicircular ridge, from
which the temporal muscle originates ;—a number of furrows
marked by the fibres of the temporal muscle; and the foramen
parietale, which is near the sagittal suture, and transmits an
artery and a vein of the dura mater ; in some skulls it is
wanting, sometimes there are two on one side and none on
the other. Upon its internal surface are the grooves of the
spinous artery ; and when the two bones are united, there is a
deep cavity extending along the sagittal suture, for the longi-.
tudinal sinus of the dura mater.

Each parietal bone is connected with its fellow, by mean?
of the sagittal suture ; with the frontal bone by the coional
suture ; with the occipital by the lambdoidal suture ; and with
the temporal by the squamous suture.
 
Annotationen