Freiburger historische Bestände - digital

EXPLANATION

OF

PLATE 42.

Fig. 1. Skull /? seen obliquely from behind and from above after removal of the superficial bony wall.
In sinus 6' and in the dorsal division of sinus 8' eight primary supporting bony lamellae are seen. The ninth
lamella cannot be seen in this position. The first lamella (1) is also septum between the two sinuses. The
first—third lamellae have been chiselled down to somewhat below the middle of their height. The waved form
and, on the second and third lamella, the thickened pneumatic basal parts may be seen. The fourth lamella is
chiselled off near the vaulted ground of the sinus 8', the wall of the cavum cranii. The fifth—eigth lamella
radiate towards the surface of the skull, and on them are seen the margins of the chiselled off waves and

arches; through the annexed--"-> the territory of each primary lamella is indicated, s septum between sinus

nasalis and sinus 6'.

Fig. 2. The same specimen, further chiselled, seen from behind. In the left half all septa and lamellae
between and in the sinuses have been chiselled down near to the wall of cavum cranii; their lines of origin
are seen, some of them are much waved. The meatus acusticus ext. has been preserved. A comparison with
the outline of the right half of the skull gives a vivid impression of the migthy depth of the sinuses as well as
of their great significance to the forming of the skull, not the less when it is remembered that the pars cerebralis
in this position presents itself in its largest breadth. The nasal bone has not been chiselled off and in this
bone is seen the large opening (*) into the sinus nasalis.

Fig. 3. The same specimen, seen from the left and a little from the front and from below, so that the
molars of both sides are seen. In the cerebral as well as in the facial part the septa and the bony lamellae
have been chiselled away down to their origin. Also the lateral wall of the alveolus of the last molar has
been partially removed.

Fig. 4. Left superior molars of the skull b. The posterior end of dps is hidden in the maxilla.

- 5. - - — d.

- 6. - /'. The posterior end of ml is hidden in the maxilla.

- 7. - - - k.