406 Cranial Nerves Cranial Nerves 407

1 FACIAL NERVE (VII). Nerve arising from the 17 Intermediate nerve. Nonmotor portion of the 3 1182 second pharyngeal arch. It emerges from the facial nerve. It emerges from the brainstem be- brain at the pontocerebellar angle between tween the facial and vestibulocochlear nerves the pons and inferior olive and passes with and conveys autonomic and taste fibers. After the vestibulocochlear nerve to the petrous various anastomoses, it merges with the facial part of the temporal bone, which it exits via nerve in the petrous part of the temporal bone. the stylomastoid foramen. It supplies the mus- D 20 cles of facial expression. A B C D 18 Geniculate ganglion. Equivalent of a spinal 2 Geniculum of facial nerve. Genu of the facial ganglion located at the geniculum of the facial nerve located just beneath the anterior wall nerve in the petrous part of the temporal bone. 24 of the petrous part of temporal bone where It contains pseudounipolar ganglion cells that A Facial nerve in the facial nerve changes direction from antero- form the chorda tympani. A temporal bone lateral to posterolateral. A 19 Chorda tympani; Parasympathetic root of 3 Nerve to stapedius. Branch supplying the submandibular ganglion. Parasympathetic fi- stapedius. A bers of the chorda tympani that travel to the 4 Posterior auricular nerve. Branch given off submandibular ganglion. C below the stylomastoid foramen. It passes 20 Greater petrosal nerve; Parasympathetic root superiorly between the mastoid process and of pterygopalatine ganglion. Nerve leaving 897 external acoustic meatus and supplies the pos- CN VII at the geniculate ganglion as a bundle terior muscles of the ear and occipital belly of of parasympathetic fibers. It reaches the ante- occipitofrontalis. B rior surface of the petrous pyramid, passes 11 5 Occipital branch. Branch supplying the oc- through the foramen lacerum, and travels cipital belly of occipitofrontalis. B with the deep petrosal nerve in the pterygoid canal to the pterygopalatine ganglion. A C 6 Auricular branch. Branch to the muscles of the auricle. B 21 Sympathetic root; Deep petrosal nerve. Sym- pathetic fibers from the internal carotid 5 7 Digastric branch. Branch supplying the pos- 12 plexus. They unite with the greater petrosal terior belly of digastric. A B 6 nerve to form the nerve of the pterygoid 8 Stylohyoid branch. Branch supplying the canal. C 10 stylohyoid that sometimes arises together B 22 Nerve of pterygoid canal. Nerve lying in the Facial nerve with the lingual branch. A 4 10 pterygoid canal situated in the root of the pter- 9 Communicating branch with glossopharyn- ygoid process. It contains parasympathetic and 1 geal nerve. A sympathetic fibers and passes to the pterygo- 13 10 Parotid plexus. Facial nerve plexus in the con- palatine ganglion. C 7 nective-tissue space between the two portions 23 Sympathetic root of submandibular gang- of the parotid gland. B lion. Sympathetic fibers from the internal car- 15 11 Temporal branches. Branches ascending over otid plexus. They pass to the submandibular the zygomatic arch to supply the muscles of ganglion via the facial artery and do not sy- 16 facial expression above the palpebral fissure napse. C and ear. B 24 Communicating branch with tympanic 12 Zygomatic branches. Branches supplying the plexus. A 428.14 lateral portion of the orbicularis oculi and mi- 25 Communicating branch with vagus nerve. metic muscles between the lid and oral fissure. Communicating branch located immediately B beneath the stylomastoid foramen. 21 13 Buccal branches. Branches supplying the 1 20 22 buccinator and mimetic muscles around the 18 mouth. B 18 14 [[Lingual branch]]. Inconstant sensory branch supplying the tongue. 19 14017 8.1 15 Marginal mandibular branch. Branch travel- ing above the mandibular margin and supply- 23 ing the muscles of facial expression below the 428.19 oral fissure. B 16 Cervical branch. Motor branch supplying the platysma. It anastomoses with the transverse cervical nerve. B

C Pterygopalatine and D Facial and submandibular ganglia vestibulocochlear nerves

Dauber, Pocket Atlas of Human Anatomy (ISBN 9783135112053) c 2006, Georg Thieme Verlag KG