. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Chapter 10—Central Nervous System 157. Fig. 10-7. Head, superficial left lateral view. 1 zygomatic branch of facial n., 2 transverse facial branch of mandibular n., 3 rostral auricular nerve, 4 auriculotemporal n., 5 branch of facial nerve to the platysma m., 6-8 buccal branches of facial n., 9 mylohyoid n. seter muscle. It joins the facial blood vessels. At the rostral border of the masseter muscle the nerve turns dorsally, crossing the blood vessels, to join the ventral buccal branch of the facial nerve (Fig. 10-10). It innervat
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Chapter 10—Central Nervous System 157. Fig. 10-7. Head, superficial left lateral view. 1 zygomatic branch of facial n., 2 transverse facial branch of mandibular n., 3 rostral auricular nerve, 4 auriculotemporal n., 5 branch of facial nerve to the platysma m., 6-8 buccal branches of facial n., 9 mylohyoid n. seter muscle. It joins the facial blood vessels. At the rostral border of the masseter muscle the nerve turns dorsally, crossing the blood vessels, to join the ventral buccal branch of the facial nerve (Fig. 10-10). It innervates the area around the angle of the mouth. The inferior alveolar nerve, n. alveolaris inferior, leaves the dorsal aspect of the mandibular nerve. It enters the mandibular canal through the mandib- ular foramen and innervates the teeth of the lower jaw. Some fibers leave the mandibular canal through the mental foramen to innervate the area of the lower lip. Cranial Nerve VI, Abducent Nerve, n. ab- ducens (Fig. 10-3). The sixth cranial nerve leaves the cranial cavity through the orbital fissure and enters the periorbita. It is the most ventral and medial of the cranial nerves which leave the cranial cavity through the orbital fissure. The nerve inner- vates the retractor bulbi and lateral rectus muscles of the eye. Its fibers are classified as general somatic efferent. Cranial Nerve VII, Facial Nerve, n. facialis (Figs. 10-3 and 10-9). The seventh cranial nerve contains special visceral efferent, special visceral af- ferent, general visceral efferent (parasympathetic) and general visceral afferent fibers. The special vis- ceral efferent fibers constitute the largest portion of the facial nerve, innervating the platysma, auricular, palpebral and facial muscles. The general visceral efferent fibers are motor to the glands of the nasal cavity, mandibular and sublingual salivary glands and the lacrimal gland. All the afferent fibers have their cell bodies in the geniculate ganglion
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