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Cranial nerves (peripheral nerve system)

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presented by Ahsan jammo

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Cranial nerves (peripheral nerve system)

  1. 1. Classification of nervous system
  2. 2. Cranial nerve There are 12 pair of cranial nerve. 1-olfactory 2-optic 3-oculomotor 4- trochlear 5-trigeminal 6- abducent
  3. 3. 7-facial 8-vestibulocochlear 9-glossopharyngeal 10-vagus 11-accessory 12-hypoglossal
  4. 4. Olfactory • Concerned with the sense of smell • It aries from receptors present in the olfactory epithelium of the nasal cavity ,pass upwards through cribiform plate of ethamoid bone and then pass to olfactory bulb ,these nerve then proceed backwards as a olfactory track , to the area for preception of smell in the temporal lobe of the cerebrum. • CN1 is the shortest cranial nerve within the human head.
  5. 5. Optic nerves • Concerned with the sense of vision • It originates from the gangliaon cell in retina they then pass through the optic foramina of the sphenoidal bone into the crania cavity and join at optic chiasma • The nerves proceed backwards as a optic tracts to the lateral geniculates bodies of thalamus
  6. 6. Oculomotor • Supplies the inferior, medial and superior recti inferior oblique musles of eye . • also supplies the levator palpebrae muscle which arise the upper eyelid .
  7. 7. Trigeminal nerve . The trigeminal nerve is the fifth cranial nerve located within the brain, and is primarily responsible for transmitting sensations from the face to the brain. It is composed of three branches: the ophthalmic, maxillary, and mandibular. ... It is also the nerve that controls the muscles used for chewing.
  8. 8. Abducent • These nerves aise from nuclie lying under the 4rth venticle floor . • It supplies the lateral rectus muscle which couse abduction of the eye ball .
  9. 9. Facial nerve • Both sensory and motor. • It is mainly a motor nerve which supplies the muscles of facial expression. • The sensory fiber convey impluses from the taste buds in the anterior two- third area of tongue to the preception area in the cerebral cortex .
  10. 10. Vestibolu cochlea nerve These nerves are composed of two divisions, the vestibular nerves and cochlear nerve . It carries the sensation from the vestibule and cochlea of the internal ear .
  11. 11. glossopharyngeal • Sensory in nature • It supplies much of toungue and phyrynx • it carries parasympathetic fiber to otic ganglion which is turn supplies paratid salivary gland
  12. 12. Vagus • Large nerve • Partially sensory and partially motor • Supply larynx , phyranx, palate • Also supply major organ of thorax and abdomen
  13. 13. Hypoglossal • It is a major nerve to the muscles of tongue • And supply muscular surrounding the hyoid bone and contribute to swallowing and speech.

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