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Cranial Nerves. 1 2 3 4 III VI V VII VIII 5 IXIX XI XII.

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Presentation on theme: "Cranial Nerves. 1 2 3 4 III VI V VII VIII 5 IXIX XI XII."— Presentation transcript:

1 Cranial Nerves



4 IV

5 Cranial Nerve 1: Olfactory Nerve Anosmia Patients complain of loss of taste. Head injury is a common cause.

6 Cranial Nerve II: Optic Nerve

7 Cranial Nerves III, IV, VI: Oculomotor, Trochlear, Abducens Trochlear Nucleus in midbrain Nerve exits dorsal surface and crosses over Moves eye medially and downward Oculomotor Nucleus in midbrain Innervates 4 extraocular muscles and functions in most eye movements Contains parasympathetic which innervates pupillary constrictor muscles and ciliary muscle of lens. Abducens Nucleus in pons Moves eye laterally

8 Trigeminal ganglion Ophthalmic, maxillary and mandibular divisions Sensory: Touch, pain, temp, proprioception for face, mouth, anterior 2/3 of tongue, nasal sinuses. Motor: Muscles of chewing, tensor tympani muscle Cranial Nerve V: Trigeminal Nerve

9 Motor function: muscles of facial expression. Parasympathetic function: innervation of lacrimal glands and some salivary gland. Visceral sensory function: taste from anterior 2/3 of tongue Cranial Nerve VII: Facial Nerve

10 Facial Nerve Lesions cause paralysis in face Bell’s Palsy Facial nerve is impaired and then gradually recovers. Cause unknown,(viral or inflammatory)

11 Auditory and vestibular sensation Travels with facial nerve Branches go to cochlea, vestibule Cranial Nerve VIII: Vestibulocochlear Nerve

12 Vestibular and Cochlear Sensory Organs

13 Lesions in Auditory Pathway 1.During auditory seizures: patients often report tones from the side opposite the cortical area involved in the seizure. 2.Vertigo can be caused by damage to vestibular pathways

14 Motor function: stylopharyngeus muscle which elevates pharynx during talking and swallowing and participates in gag reflex. Parasympathetic function: innervation of parotid salivary gland. Visceral sensory function: taste from posterior1/3 of tongue Cranial Nerve IX: Glossopharyngeal Nerve

15 Motor function: pharyngeal muscles (swallowing) & laryngeal muscles (vocalization) Parasympathetic function: innervation of heart, lungs, most if digestive tract. Somatic sensation function: sensation from pharynx, meninges, external auditory meatus. Cranial Nerve X: Vagus Nerve

16 Motor : sternomastoid upper trapezius muscles Cranial Nerve XI: Spinal Accessory Nerve

17 Motor function: intrinsic and extrinsic tongue muscles. Cranial Nerve XII: Hypoglossal Nerve


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