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Summary.The arterial vasculature in the region of the floor of the mouth was studied in the guinea pig by means of the acryl plastic injection method.1. The arteries observed in the region were the sublingual artery of the facial, the alveolingual of the maxillary and the sublingual branches of the lingual.2. The branches of the sublingual were as follows : (1) the mylohyoid branches to the muscle, (2) the muscular branches to the digastric, mylohyoid and geniohyoid muscles, (3) the submandibular lymph node branches to the nodes, skin and muscles in the submental and submandibular regions, (4) the mandibular transversal branches to the muscle, (5) the alveolar branches to the periodontal tissue of the incisors and adjacent bone, (6) the preincisive branch (the terminal) to the labial gingiva and mucosa of the incisors, the symphysis and the adjacent tissues, and (7) the retroincisive branch (the terminal) to the lingual and lateral gingivae of the incisors, the symphysis and the adjacent tissues.3. The alveolingual artery of the maxillary divided below the third molar into superior and inferior branches.They anastomosed with the sublingual branch of the lingual near the minor sublingual gland to form two arterial arches in the alveolingual area, supplying the lingual gingiva of the molar region, the mylohyoid muscle and the lingual nerve.4. The sublingual branches of the lingual supplied the sublingual papilla, the adjacent mucosa, the originating portion of the geniohyoid and genioglossal muscles and the minor sublingual gland.

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