Cranial Nerves 7 to 12

Cranial Nerve Type Innervates Fxns Origin Exits Skull tests for lesion
7- Facial Nerve mixed and parasympathetic facial muscles, middle ear, oral cavity, platysma, stylohyoid, posterior belly digastric motor- facial expressions, inner ear. sensory- taste (ant 2/3 tongue). parasym- salivates (submandibular & sublingual glands), mucus secreting, tears (lacrimal gland) pons internal auditory meatus, stylomastoid foramen, petrotympanic fissure/ PCF cannot taste/ cannot cry
8- Vestibulocochlear sensory inner ear hearing, linear acceleration (gravity), angular acceleration (head turning) pons Internal Auditory Meatus/ PCF cannot hear
9- Glossopharyngeal mixed and parasympathetic pharynx, neck, tongue motor- 1 muscle for swallowing. sensory- taste and somatic sensation for post. 1/3 tongue, pharynx, tonsils, sensory to carotid body and sinus. parasymp- salivate (parotid gland) medulla jugular foramen/ PCF gag reflex
10- Vagus mixed and parasympathetic neck, pharynx, larynx, GI tract, palate motor- palate, pharynx, larynx. sensory- larynx and GI. parasymp- smooth muscle of GI and gut medulla jugular foramen/ PCF cannot swallow/ cannot speak
11- Accessory motor trapezius, sternocleidomastoid scapular movement, neck flexion and rotation medulla jugular foramen/ PCF cannot elevate/ retract scapula
12- Hypoglossal motor all intrinsic and 3 of 4 extrinsic tongue muscles tongue movement medulla hypoglassal canal/ PCF cannot protrude tongue