=V. submentalis= (Fig. 131, _f_).--This enters the anterior facial vein at the ventral border of the masseter muscle and near the cranial end of the two superficial lymph-glands (12) in this region. The submental vein is formed at the dorsal border of the digastric muscle by two branches emerging from between the digastric and the mandible. The more cranial of these, =V. lingualis=, collects branches from the tongue, from its middle to the tip; it passes through the middle of the lateral border of the mylohyoid muscle to join the other branch. The second branch emerges from between the mandible and the pterygoid muscles. It comes from near the caudal end of the mandible, where it becomes continuous with a communicating branch from the posterior facial vein, and receives a branch which comes from the mandibular canal; also small branches from the adjacent parts. _e._ =V. facialis posterior= (Fig. 131, _b_).--The posterior facial vein arises from the region of the internal maxillary artery, its terminal branches following the branches of the artery. It collects blood from the pterygoid, masseter (9), and temporal muscles, and forms a plexus which is interwoven with the carotid (arterial) plexus in the region of the orbital fissure. It is connected with the submental vein by a communicating branch. From the posterior facial a branch extends ventrad close against the outer surface of the tympanic bulla and then turns caudad, receives a branch from the pharynx, then continues to join the internal jugular. The posterior facial itself passes laterad along the caudal border of the masseter (9) and the ventral border of the parotid gland (10), then becomes superficial and turns ventrad over the outer surface of the submaxillary gland (11) to join the anterior facial (_c_) caudad of the angle of the jaw. As it passes ventrad of the parotid gland (10), just before becoming superficial, the posterior facial receives the =superficial temporal= (_m_). This at first follows the superficial temporal artery (_s_), then enters the substance of the parotid gland, joining the posterior facial near the ventral border of the latter. The superficial temporal receives the =anterior auricular= (_n_), a large vein passing along the cranial border of the auricular opening and arising dorsad of the eye. The posterior facial receives also, at the point where it passes from beneath the parotid gland, the =posterior auricular= or =great auricular= vein (_l_). This collects blood from the back of the head and the external ear, its branches following those of the artery of the same name. It passes along the caudal border of the parotid gland to join the posterior facial.