Manual of human histology . ssue beyond these glands is, as in other regions, soft con-nective tissue, without elastic elements. The mucous membrane, in the proper nasal cavities, isvery richly supplied with vessels, and less so in the accessorysinuses. The terminal branches of these vessels form looseplexuses around the glands, and in the trunks and branches ofthe olfactory nerves; while on the surface of the mucousmembrane itself, they constitute a more close network withnumerous horizontal loops, at first sight leading to the sup-position of the presence of papillae, which, however, do note
Manual of human histology . ssue beyond these glands is, as in other regions, soft con-nective tissue, without elastic elements. The mucous membrane, in the proper nasal cavities, isvery richly supplied with vessels, and less so in the accessorysinuses. The terminal branches of these vessels form looseplexuses around the glands, and in the trunks and branches ofthe olfactory nerves; while on the surface of the mucousmembrane itself, they constitute a more close network withnumerous horizontal loops, at first sight leading to the sup-position of the presence of papillae, which, however, do notexist. The branches, also, of the arteries and veins enter intonumerous anastomoses, and constitute (the latter especially)on the inferior spongy bones, the abundant spongiform plexusalready noticed. Nothing is known of the lymphatics of thenasal mucous membrane. The nerves are, in the first place,branches of the fifth pair (ethmoidal, posterior nasal, and abranch of the greater anterior dental nerve), which supply Fig. especially the ciliated region of the organ, presenting there thesame conditions as the nerves in other sentient mucous mem-branes {oiihej)harynoo for example), but also extend to the properolfactory region; and, as I noticed in one instance in the Fig. 313. From the olfactory nerve of Man, x 350 diam.: A, nerve-tubes fromthe tractus, in water; B, in syrup, appearing contracted; C, nerve-cells, from thebulb ; D, nerve-fibres, from the branches in the olfactory organ. THE NOSE. 421 Calf, send scattered dark-bordered primitive fibres in tbecourse of tlie branches of the olfactory nerves. The olfactorynerve, in its tract and bulb, contains dark-bordered fibresand nerve-cells, of which vre have already spoken (vol. 1,p. 444). The nervi olfactorii, on the other hand, in Manand in other Mammalia, even in the main trunks given offfrom the olfactory bulb, present no white medullated fibresat all, but are wholly constituted of pale, slightly granularflattened fibres
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
