This document summarizes the 12 cranial nerves, including their classification, function, and key structures innervated. It describes the olfactory nerve (CN I) as sensory and responsible for smell. It notes the optic nerve (CN II) is sensory and conveys visual information from the retina. It outlines the oculomotor nerve (CN III) has both autonomic and motor components, innervating eye muscles and the pupillary sphincter.

1. CRANIAL NERVES.
Prof. Mamun Sarhan.
Head of Neurology Dept.
Zagazig University

3. Olfactory Nerve CN I
CLASSIFICAT FUNCTION
ION
sensory Olfaction
(smell)

4. Olfactory
Nerve – CN I

5. Lesion of olfactory
nerve : Anosmia

6. Optic Nerve
CN II

7. Optic Nerve – CN II
CLASSIFICATION FUNCTION
l Sensory Convey visual
information from the
retina

8. Examination
* visual field
* Perimetry
* Confrontation method
* each eye separately using finger
* Ophthalmoscopic examination
* Colour blindness test

9. Oculomotor Nerve
CN III

10. Oculomotor Nerve CN III
CLASSIFICATION NUCLEI FUNCTION
Autonomic Edinger-Westphal nuclei Parasympathetic supply to
constrictor pupillae and
ciliary muscles
Motor Oculomotor nuclei Innervation of levator
palpebrae superioris,
superior , medial and
inferior recti, and inferior
oblique muscles of the eye

11. Oculomotor Nerve – CN III

12. Trochlear Nerve
CN IV

13. Trochlear Nerve - CN IV
CLASSIFICATION motor
NUCLEI Trochlear
FUNCTION Innervation of
superior oblique
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14. Abducens Nerve
CN VI

15. Abducens Nerve CN VI
CLASSIFICATION FUNCTION
motor) Innervation of
Lateral rectus
muscle of the eye Lateral
Lateral
rectus
rectus
muscle
muscle
Abducens
Abducens
nerve
nerve
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16. Abducens Nerve – CN VI
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17. Trigeminal Nerve
CN V

18. Trigeminal Nerve CN V
SENSORY
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19. Facial Nerve
CN VII

20. Facial Nerve CN VII
MOTOR
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21. Vestibulocochlear nerve
CN VIII

22. Ear
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23. Glossopharyngea
l
CN IX

24. Glossopharyngeal Nerve
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25. Vagus Nerve
CN X

26. Overview
of
Vagus
Nerve
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27. Spinal Accessory
Nerve
CN XI

28. Spinal Accessory Nerve – CN XI
CLASSIFICATION NUCLEUS FUNCTION
Special Visceral Efferent Accessory (spinal) To supply sternomastoid and trapezius
muscles
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29. Spinal Accessory Nerve – CN XI
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30. Hypoglossal
Nerve
CN XII

31. Thank You!!!