. Anatomy, descriptive and surgical. twork is found, which is either alymphoid tissue continuous with the sheath ofthe duct or a system of branching tubes bywhich the ducts commence between the sali-vary cells (Fig. 565), as the biliary ducts aresaid to commence between the hepatic cells. The ducts have also diverticular pas-sages lined with columnar epithelium; and it seems that the secretion goes on inthese diverticula and in the wider portions of the ducts where the columnar epithe-lium exists, as well as in the alveoli. The lobules of the salivary glands are richlysupplied with blood-vesse
. Anatomy, descriptive and surgical. twork is found, which is either alymphoid tissue continuous with the sheath ofthe duct or a system of branching tubes bywhich the ducts commence between the sali-vary cells (Fig. 565), as the biliary ducts aresaid to commence between the hepatic cells. The ducts have also diverticular pas-sages lined with columnar epithelium; and it seems that the secretion goes on inthese diverticula and in the wider portions of the ducts where the columnar epithe-lium exists, as well as in the alveoli. The lobules of the salivary glands are richlysupplied with blood-vessels, which form a dense network in the interalveolar plexuses of nerves are also formed in the interlobular tissue. Pfliiger describesthe nerves as being directly continuous with the salivary cells of the alveolus, thenerve sometimes passing through a ganglion-cell just before joining the alveolua(Fig. 564, a and b). In the submaxillary and sublingual glands the lobes are larger and more looselyunited than in the An Alveolus of a Compound Racemose Gland,injected from the Excretory Duct (highlymagnified). Hardly anything but the darkinjecting fluid is shown; the alveolar cellsand nuclei are only faintly indicated; thoseof the duct are not represented at all. Theinjection is seen filling the central cavityof the alveolus, and passing from this infine channels (represented by black reticu-lating lines) between and around the cells(after Saviotti). 856 ORGANS OF DIGESTION. Mucous Glands.—Besides the salivary glands proper, numerous other glandsare found in the mouth. They appear to secrete mucus only, which serves to keepthe mouth moist during the intervals of the salivary secretion, and which is mixedwith that secretion in swallowing. Many of these glands are found at the posteriorpart of the dorsum of the tongue, behind the circumvallate papillae, and also alongits margins as far forward as the Others lie around and in the tonsil betweenits crypts, a
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