19 B Cranial Nerves Flashcards
Cranial Nerve I: Olfactory
-Sensory
Impulse Smell
Anosemia
Cranial Nerve 2: Optic
Sensory
Impulse Sight
Anopsia
Cranial Nerve lll: Oculomotor
Motor
Functions:
1. Raising the eyelid
2. Directing the eyeball
3. Constricting the iris
4. Controlling lens shape
Disorder- External Strabismus
Cranial Nerve IV: Trochlear
Motor
Directs Eyeball
Double Vision
Cranial Nerve V: Trigeminal
Both Motor and Sensory
Composed of three divisions: ophthalmic (V1), maxillary (V2), and mandibular (V3)
Disorder - Trigeminal neuralgia (tic douloureux)
Cranial Nerve VI: Abdcuens
Motor
Rotates Eyeball
Internal Strabismus
Cranial Nerve VII: Facial
Both
Motor functions include
1. facial expression
2. lacrimal (tearing)
3. salivary glands (drewling)
Sensory function is taste from the anterior two-thirds of the tongue
Disorder - Bells Palsy
Cranial Nerve VIII: Vestibulocochlear
sensory
equilibrium and hearing
Disorder to the Cochlear division results in Nerve Deafness
Disorder to the Vestibular division results in vertigo (rapid eye movement) and dizziness.
Cranial Nerve IX: Glossopharyngeal
Both
Motor – innervates part of the tongue and pharynx, and provides motor fibers to the parotid salivary gland
Sensory – fibers conduct taste and general sensory impulses from the posterior 1/3 of the tongue, and pharynx
Disorder- impairs swallowing and taste
Cranial Nerve X: Vagus
Both
Motor- Most motor fibers are parasympathetic fibers to the heart, lungs, and visceral organs
sensory- taste
Disorder - Hoarseness of the voice and difficulty swallowing
Cranial Nerve XI: Accessory
Motor
Innervates the trapezius and sternocleidomastoid, which move the head and neck
Disorder- difficulty shrugging the shoulders
Cranial Nerve XII: Hypoglossal
Motor
controls tongue movements of speech, food manipulation, and swallowing.[
Disorder- tongue deviation away from the affected side
Moves eye laterally
(VI Abducens)
Lateral Rectus Muscle
Moves eye medially
III (Oculomotor)
Medial Rectus
Elevates Eye
III (Oculomotor)
Superior Rectus
