. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. carefully examined macroscopically. The notes on the case made on dissection and examination are as follows: "The nasal duct on the left side is extremely short. It passes from a normally situated lachrymal sac downwards, backwards and inwards and terminates by opening into the middle meatus of the nose a short distance below the hiatus semilunaris (see Fig. 1). The opening is guarded by a lunate flap of mucous membrane. The duct possesses no other nasal opening that can be discovered. At the point in the roof of the inf
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. carefully examined macroscopically. The notes on the case made on dissection and examination are as follows: "The nasal duct on the left side is extremely short. It passes from a normally situated lachrymal sac downwards, backwards and inwards and terminates by opening into the middle meatus of the nose a short distance below the hiatus semilunaris (see Fig. 1). The opening is guarded by a lunate flap of mucous membrane. The duct possesses no other nasal opening that can be discovered. At the point in the roof of the inferior meatus where the opening of the duct might be expected to be found there is a cone-shaped recess. From the deep aspect of the mucous membrane lining the apex of the cone a fibrous cord passes upward through the normal bone canal to join the inferior aspect of the nasal duct a short distance below the lachrymal ; From the fact that the bone canal was developed and that a fibrous cord lay in it, it was thought that the duct might have originally been normally developed and that it might have become secondarily obliterated and that the existing channel might have been an artifi- cially made "false" passage of accidental or deliberate origin. An attempt to solve the difficulty was made by subjecting portions of the tissues to microscopic examination. Four blocks were prepared. The approximate positions of the tissue sections examined and here described are indicated on Fig. 2 by the lines I, II, III, and IV. Fig. 2. Diagram to show the general relations of the ab- normal Duct and the positions from which blocks of tissue were removed for microscopic examination. 31. 31. Middle Meatus. I. 31. Inferior Meatus. F. C. Fibrous Cord. I, II, III and IV show positions of sections I, II, III and IV. Section I. Shows a duct of normal structure, the lining of ciliated epithelium is well preserved in places; at others it has been rubbed Fig. 1. To show the position of
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