. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 136 Anatomy of the Woodenuck, Marmota monax. Fig. 9-8. Veins and lymph nodes of the head, lateral view. 1 maxillary v., 2 anastomoses between maxillary and facial veins, 3 brachiocephalic trunk, 4 axillary v., 5 linguofacial v., 6 superficial cervical In., 7 lingual v., 8 mandibular In., 9 facial v. mandibular lymph nodes. At the angle of the jaw the lingual vein has a large anastomoses with the pterygoid plexus. The deep lingual veins, vv. profundae linguae, drain the tongue. They arise from a dorsal lingual plexus. The vessels p
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 136 Anatomy of the Woodenuck, Marmota monax. Fig. 9-8. Veins and lymph nodes of the head, lateral view. 1 maxillary v., 2 anastomoses between maxillary and facial veins, 3 brachiocephalic trunk, 4 axillary v., 5 linguofacial v., 6 superficial cervical In., 7 lingual v., 8 mandibular In., 9 facial v. mandibular lymph nodes. At the angle of the jaw the lingual vein has a large anastomoses with the pterygoid plexus. The deep lingual veins, vv. profundae linguae, drain the tongue. They arise from a dorsal lingual plexus. The vessels pass ventrally and unite along the ventral border of the tongue to form the lingual vein. The sublingual vein, v. sublingualis, drains the floor of the mouth and the intermandibular area. It passes caudally and drains into the lingual vein. The left and right sublingual veins anastomose with each other across the intermandibular space by means of a small hyoid arch, arcus hyoideus. The linguofacial vein passes caudally along the ventral border of the sternocephalic muscle, deep to the ventral cutaneous muscle of the neck. In the mid-cervical region it anastomoses with the max- illary vein (Figs. 9-5 and 9-8). The linguofacial vein passes ventral (external) to the clavicle and enters the thorax medial to the first rib. It joins the max- illary and axillary veins to form the brachiocephalic vein. The latter continues as the cranial caval vein. Note: Hill (1937) considered the anastomoses between the maxillary and linguofacial veins to be the continuation of the maxillary vein. He de- scribed a venous loop off the external jugular vein around the clavicle that is considered here to be the continuation of the maxillary vein. The maxillary vein, v. maxillaris, drains the cau- dal and deep parts of the head, including the brain. Blood flows by means of the transverse facial, su- perficial temporal, infraorbital, inferior alveolar, palatine, deep temporal, masseteric, caudal auricu- la
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