Quain's elements of anatomy . The Ijimpliatics are large. According to the observations of His on the calf,the larger blood-vessels passing to the centre are each accompanied by two ormore lymphatic trunks. These arise from an interlobular plexus, which again isin connection with vessels which surround and enclose the individual follicleswithout penetrating them (as in those of the intestine). Tlie nerves are very minute. Haller thought that they were partly derivedfrom the phrenic nerves, but according to Cooper, no filaments from these nervesgo into the gland, although they reach the investi
Quain's elements of anatomy . The Ijimpliatics are large. According to the observations of His on the calf,the larger blood-vessels passing to the centre are each accompanied by two ormore lymphatic trunks. These arise from an interlobular plexus, which again isin connection with vessels which surround and enclose the individual follicleswithout penetrating them (as in those of the intestine). Tlie nerves are very minute. Haller thought that they were partly derivedfrom the phrenic nerves, but according to Cooper, no filaments from these nervesgo into the gland, although they reach the investing capsule, as does also abranch from the descendens noni. Small filaments, derived from the pneumo-gastric and sympathetic nerves, descend, on the thyi-oid body, to the upper partof the thymus. Sympathetic nerves also reach the gland along its various arteries. For the literature of the thymus, as well as many details of its comparativestructure, the reader is referred to a paper by Dr. H. Watney in the Phil. Trans,for 54-4 THE MOUTH. OKGANS OF DIGESTION. The cliff est ive a2)paratns consists of the alimentary canal, togethermth Yarious glands of which it receives the secretions. The ahmentary canal commences at the mouth and terminates at theanus. Its average length is about thirty feet,—about five or six timesthe length of tlie body. The part in the head and thorax consists of the moufk, with the teeth,and salivary glands, the pharynx, and the asopliayiis or gullet. Thepart contained in the abdomen and pelvis consists of the stomach andthe small and large intestine. Numerous small glands are situated inthe mucous membrane of the alimentary canal, and the ducts oflarger glands, the salivary glands, jxmcreas and liver, open on its innersurface, THE MOUTH. The montk is bounded by the lips, cheeks, tongue, and the hard andsoft palate, and communicates behind with the pharynx through thefauces (isthmus i^iucium). It is lined throughout by mucous membrane,and into it open
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