Freiburger historische Bestände - digital

EXPLANATION(l)

OF

PLATE 41.

In the figures 1—9 are delineated a series of transverse sections through the left half of the head of the
old Elephant "Chang", all seen from the caudal plane. The mandible, the brain, the external ear etc. have been
removed. Most of the nasal septum is present in the sections. The specimen sectioned has been delineated
in the Plate 41 bis from the lateral and from the medial side, to show the position of the cuts; in the last
figure parts of the nasal septum present in the sections have been omitted.

Figg. 1—8 are all in \ nat. size.

Fig. 1, Section a. The cut has gone through the anterior end of the intermaxillary bone, which is here
not apposed to the other intermaxillary. To the right is seen the organon Jacobsoni in a furrow in the bone.
To the left the dens incisivus, which in this specimen is very small and wholly included in the bone; the white
spot in the middle of the tooth is the pulpa-cavity; the dentine presents externally a darker zone, then follows
a lighter zone, most of the tooth has again a darker hue.

Fig. 2, Section b. The intermaxillary has on this point coalesced with the other intermaxillary. To the
right the organon Jacobsoni. The cut has gone obliquely through the proximal, end of the incisor, so that
only a narrow crescent-like dentine mantle surrounds the pulpa. The nasal cavity is continued dorsad with a
narrow fissure. Further dorsad the anterior end of the nasal cartilage has been hit. The dark spots are veins.

Fig. 3, Section c. The nasal cavity extends here far dorsad with a narrow fissure. The organa Jacobsoni
are now enclosed within a bony tube, the intermaxillary as well as the maxillary bones of the right and left
side being united.

Fig. 4.

foramen infraorbitale j||

nasal cartilage

small cartilage (comp. PI. 39 fig. 4)
fissure-like part of nasal tube
muscular cushion

I- membranous nasal septum

nasal tube

iS| 0Sp — organon Jacobsoni

molar

orbit ■

nictitating membrane —

orbit

loramen infraorbitale

- - nasal cartilage

2^—— nasal tube

H

I ll— nasal septum

f -$— nasal tube

f— organon Jacobsoni

M-molar

Fig. 5.

Fig. 4, Section d, a little before the orbit.

Fig. 5, Section e. The cut passes through the anterior end of the orbit; a small anterior part of the eye
has been removed by the cut and become lost; the white spot indicates its place. Most of the content of the
orbit is lying in the following slice between the cuts e and f. The nasal tube, which has here a flexure, has
been cut in two places.