ANATOMY EXAM 3 STUDY GUIDE – HEAD NECK.doc

ANATOMY EXAM 3 STUDY GUIDE – HEAD NECK CRANIAL NERVES CN Name Origin Foramen Fibers Branches Functions I Olfactory CNS ectoderm Cribiform plate (ethmoid bone) Sensory SA Transmit olfaction to brain II Optic Diencephalon Optic canal Sensory SA Transmit visual info to brain III Oculomotor Mesencephalon Superior orbital fissure Motor GSE GVE GSE – motor innervation to all but 2 extraocular muscles GVE – pregang parasymp fibers to ciliary ganglion cells IV Trochlear Metencephalon or mes? Superior orbital fissure Motor GSE Motor innerv to superior oblique extraocular muscle V Trigeminal Metencephalon V1 – Superior orbital fissure V2 – foramen rotundum V3 – foramen ovale Both GSA SVE GVE V1 – ophthalmic V2 – maxillary V3 – mandibular GSA – extero and proprioceptive sensory nerve of face and anterior head (Great somatic sensory nerve) SVE – motor innerv to striated muscles of mastication VI Abducens Metencephalon Superior orbital fissure Motor GSE Motor innerv to lateral rectus extraocular muscle VII Facial Metencephalon Internal acoustic meatus (for all branches) Both SVE GVE SA GSA GVA Temporal Zygomatic Buccal Mandibular Cervical SVE – striated muscles that originated from branchial arch 2 for facial expression GVE – pregang parasymp fibers to pterygopalatine and submandibular ganglia cells SA – taste buds of palate and anterior tongue GSA – exteroceptive sensation from skin behind ear, in floor of external auditory meatus, outer surface of eardrum GVA – interoceptive from nasal cavity mucosa, oral cavity and palate; glands controlled by pterygopalatine and submandibular glands VIII Vestibulocochlear Metencephalon Internal acoustic meatus Sensory SA From sensory hair cells of vestibular labyrinth for balance and hearing IX Glossopharyngeal Myencephalon Jugular foramen Both GVA GVE SA SVE GSA GVA – from posterior tongue (glossus) and pharynx, auditory/Eustachian tube, middle ear, inner eardrum surface GVE – pregang parasymp fiber