Scott.lehbauer@lethbridgecollege.ab.ca<br />Cranial Nerves<br />
Cranial Nerves<br />Cranial nerves are nerves that originate in the cranium<br />There are 12 pairs of cranial nerves<br /...
Cranial Nerves<br />
I – Olfactory Nerve<br />Olfactory Nerve (83)<br />FUNCTION<br />Purely sensory nerve<br />Carries afferent impulses for t...
II – Optic Nerve<br />FUNCTION<br />Purely sensory<br />Carry afferent impulses for vision<br />TEST<br />See bilaterally<...
III – Oculomotor Nerve<br />FUNCTION<br />Chiefly motor nerve<br />Cause pupil constriction<br />Eye movement <br />TEST<b...
IV – Trochlear Nerve<br />FUNCTION<br />Primarily motor nerves<br />Cause eye movement in one of the extrinsic eye muscles...
V – Trigeminal Nerve (The largest Cranial Nerve)<br />FUNCTION <br />Mixed nerve <br />Provides sensory and motor input fo...
VI – Abducens Nerve<br />FUNCTION<br />Motor nerve<br />Supplies motor fibers to the lateral rectus muscles which move the...
VII – Facial Nerve<br />FUNCTION<br />Mixed nerve <br />the chief motor nerve for the muscles of the face<br />TEST<br />W...
Bell’s Palsy<br />Is characterized by paralysis of the face muscles on the affected side and partial loss of taste sensati...
VIII – Auditory Nerve<br />FUNCTION<br />Mostly sensory, some motor<br />Branches transmit the afferent fibers affecting t...
IX – Glossopharyngeal Nerve<br />FUNCTION<br />Mixed nerve<br />Provides motor fibers to the muscles of the tongue and pha...
X – Vagus Nerve<br />FUNCTION<br />Mixed nerve <br />Motor fibers supply heart, lungs and abdominal viscera<br />Regulates...
XI – Spinal Accessory Nerve<br />FUNCTION<br />Motor Nerve<br />innervates trapezius and Sternocleidomastoid <br />TEST<br...
XII – Hypoglossal Nerve<br />FUNCTION<br />Motor Nerve (primarily motor)<br />Carries motor fibers to the tongue <br />TES...
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Bio 161 _lab__9_cranial_nerves

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Bio 161 _lab__9_cranial_nerves

  1. 1. Scott.lehbauer@lethbridgecollege.ab.ca<br />Cranial Nerves<br />
  2. 2. Cranial Nerves<br />Cranial nerves are nerves that originate in the cranium<br />There are 12 pairs of cranial nerves<br />The first two pairs attach to the forebrain <br />The others originate in the brain stem<br />
  3. 3. Cranial Nerves<br />
  4. 4. I – Olfactory Nerve<br />Olfactory Nerve (83)<br />FUNCTION<br />Purely sensory nerve<br />Carries afferent impulses for the sense of smell<br />TEST<br />smell bilaterally<br />
  5. 5. II – Optic Nerve<br />FUNCTION<br />Purely sensory<br />Carry afferent impulses for vision<br />TEST<br />See bilaterally<br />Optic Nerve (84)<br />
  6. 6. III – Oculomotor Nerve<br />FUNCTION<br />Chiefly motor nerve<br />Cause pupil constriction<br />Eye movement <br />TEST<br />Pupil contraction when light is shined into eye<br />Oculomotor Nerve (85)<br />
  7. 7. IV – Trochlear Nerve<br />FUNCTION<br />Primarily motor nerves<br />Cause eye movement in one of the extrinsic eye muscles (Superior oblique)<br />TEST<br />Tracking of eye from left to right<br />Trochlear Nerve (86)<br />
  8. 8. V – Trigeminal Nerve (The largest Cranial Nerve)<br />FUNCTION <br />Mixed nerve <br />Provides sensory and motor input for the face and associated structures<br />TEST<br />Sensation on three sections of the face bilaterally<br />Trigeminal Nerve (87)<br />
  9. 9. VI – Abducens Nerve<br />FUNCTION<br />Motor nerve<br />Supplies motor fibers to the lateral rectus muscles which move the eye<br />TEST<br />eye tracking from left to right<br />Abducens (88)<br />
  10. 10. VII – Facial Nerve<br />FUNCTION<br />Mixed nerve <br />the chief motor nerve for the muscles of the face<br />TEST<br />Wrinkle forehead<br />Close eye<br />smile<br />Facial Nerve (89)<br />
  11. 11. Bell’s Palsy<br />Is characterized by paralysis of the face muscles on the affected side and partial loss of taste sensation.<br />The lower eyelid droops, corner of the mouth sags, tears may continuously drip from eye to eye<br />These symptoms are caused by damage to the facial nerve<br />
  12. 12. VIII – Auditory Nerve<br />FUNCTION<br />Mostly sensory, some motor<br />Branches transmit the afferent fibers affecting the sense of equilibrium and hearing<br />TEST<br />Bilateral hearing<br />Balance with your eyes closed<br />Auditory Nerve (90)<br />
  13. 13. IX – Glossopharyngeal Nerve<br />FUNCTION<br />Mixed nerve<br />Provides motor fibers to the muscles of the tongue and pharynx<br />TEST<br />Gag reflex<br />Glossopharyngeal Nerve (91)<br />
  14. 14. X – Vagus Nerve<br />FUNCTION<br />Mixed nerve <br />Motor fibers supply heart, lungs and abdominal viscera<br />Regulates heart rate, breathing rate and digestive system activity<br />TEST<br />Say “Ah” uvula is midline<br />Swallow<br />Vagus Nerve (92)<br />
  15. 15. XI – Spinal Accessory Nerve<br />FUNCTION<br />Motor Nerve<br />innervates trapezius and Sternocleidomastoid <br />TEST<br />Shoulder Shrug against resistance<br />Spinal Accessory Nerve (93)<br />
  16. 16. XII – Hypoglossal Nerve<br />FUNCTION<br />Motor Nerve (primarily motor)<br />Carries motor fibers to the tongue <br />TEST<br />Stick out tongue and look for tremors<br />Hypoglossal Nerve (94)<br />

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