SI. Name of the No. Cranial nerve Branches Nature Origin Distribution 1. Olfactory nerve — Purely somatic sensory nerve. Anterior end of olfactory lobe. Mucous membrane of the nasal sacs. 2. Optic nerve — Purely somatic sensory nerve. Ventro-lateral part of the optic lobe Retina of the eye. 3. Occulomotor nerve Somatic motor nerve. Ventral surface of the midbrain (crura cerebri) Muscles of the eye (internal, superior rectus, inferior and inferior obliquemuscles) 4. Trochlear nerve (Pathetic) Somatic motor nerve. Dorsally between the optic lobes and cerebellum Fifth muscle of the eye (superior obliquemuscle) 5. Trigeminal nerve a. Opthalmic b. Maxillary c. Mandibular Mixed nerve Somatic sensory nerve Somatic Sensory nerve mixed nerve. Antero-lateral part of medulla oblongata a. Skin of snout b. Skin of the upperjaw and lower eye lid. c. Muscles of the lower jaw and its skin. 6. Abducens nerve Somatic motor nerve Ventral side of the medulla oblongata muscles of the eye 7. Facial nerve a. Palatine b. Hyomandi-bular Mixed nerve Visceral sensory nerve Visceral motor nerve Lateral parts of the medulla oblongata Mucous membrane (roof of the buccal cavity) Muscles of the lower jaw and hyoid apparattus. 8. Auditory nerve — Somatic sensory nerve Lateral parts of medulla oblongata Internal ear (auditory organ) 9. Glossopharyngeal Sends a branch to the facial nerve. Mixed nerve (Visceral sensory and visceral motor). Lateral parts of medulla oblongata. Mucous membrance of tongue, pharynx and muscles of the hyoid. 10. Vagus nerve a. Cutaneous b. Cardiac c. Laryngeal d. Pulmonary e. Gastric Mixed nerve (Somatic, visceral sensory and visceral motor) Sensory nerve Motor nerve Mixed nerve motor nerve mixed nerve Lateral parts of medulla oblongata Skin of the dorsal body wal Heart Laryngotracheal chamber Lungs Stomach 11. Spinal accessory Motor nerve Medulla Muscles of neck 12. Hypoglossal Motor nerve Medulla Muscles of tongue