. The anatomy of the domestic animals. Veterinary anatomy. 800 NERVOUS SYSTEM OF THE HORSE small superficial petrosal nerve from the tympanic plexus, through which communi- cations are made wdth the facial and glosso-pharyngeal nerves. Sympathetic fibers are derived from the plexus on the internal maxillary artery. Efferent fila- ments go to the tensor palati, tensor tympani, and pterygoid muscles and to the Eustachian tube. The ganglion is small and somewhat difficult to find, and in many cases it is replaced by a number of minute ganglia interspersed in a fine plexus. 5. The superficial temp

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. The anatomy of the domestic animals. Veterinary anatomy. 800 NERVOUS SYSTEM OF THE HORSE small superficial petrosal nerve from the tympanic plexus, through which communi- cations are made wdth the facial and glosso-pharyngeal nerves. Sympathetic fibers are derived from the plexus on the internal maxillary artery. Efferent fila- ments go to the tensor palati, tensor tympani, and pterygoid muscles and to the Eustachian tube. The ganglion is small and somewhat difficult to find, and in many cases it is replaced by a number of minute ganglia interspersed in a fine plexus. 5. The superficial temporal nerve (N. temporalis superficialis) (Figs. 562, 646, 647) runs outward across the pterygoideus lateralis, passes between the parotid gland and the neck of the ramus of the mandible, turns around the latter, and di- vides into two branches. The transverse facial branch (Ramus transversus faciei) accompanies the transverse facial vessels and ramifies in the skin of the cheek. The larger ventral branch unites with the ventral buccal division of the facial nerve. Before its division the nerve gives off twigs to the guttural pouch, the parotid gland, the external ear, and the skin of the external acoustic meatus and the mem-. The bone has been i cheek teeth and gums; i ing's Atlas.) 3. 648.—Part of Branch of Lower Jaw of Horse; Medial View, moved to show the vessels and nerves. /, 1', Mandibular alveolar nerve; 2, 2, branches to , branch to canine and incisor teeth; 5, 3', alveolar artery; 4, satellite vein. (After Leiser- brana tympani. Branches from it concur with filaments from the cervical branch of the facial nerve in the formation of the auricular plexus. 6. The mandibular alveolar nerve (N. alveolaris mandibulse) (Figs. 561, 562, 646)^ arises with the lingual Ijy a common trunk which passes forward at first on the lateral pterygoid muscle, then inclines ventrally between the medial pterygoid and the ramus of the mandible. The lingual and alveolar separate at an acute a