Unit 3 - 1 Cranial Nerves(pp 644-669 I Nerve modalities...

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Cranial Nerves (pp. 644-669) I. Nerve modalities carried by the 12 pairs of cranial nerves A. Motor 1. Somatic motor neurons - innervation of skeletal muscles of face, larynx, pharynx (Branchial motor neurons), tongue and in orbit 2. Visceral (autonomic) parasympathetic neurons - innervation smooth/cardiac muscle and glands B. Sensory 1. Somatic sensory neurons - general sensory from skin and mucus membranes (temperature, pressure, etc.) 2. Special sensory neurons - includes smell and taste sensations as well as senses sight, hearing and balance 3. Visceral (autonomic) sensory neurons - visceral sensation from parotid gland, carotid sinus/body, middle ear, pharynx, larynx thorax and abdomen II. Cranial Nerves A. Olfactory (CN I) 1. carries special sensory neurons - smell 2. bundles of olfactory nerves pass from nasal mucosa through cribriform plate to olfactory bulb and tract a. collectively referred to as olfactory nerve b. neurons undergo turnover every 60 days 3. head trauma may tear olfactory neurons = loss of smell Most common cause is viral illness/idiopathic B. Optic (CN II) 1. carries special sensory neurons - sight 2. neurons pass from retina through optic canal to optic chiasm and along optic tracts to temporal lobe a. at chiasm neurons from medial side of eye cross to opposite optic tract b. chiasm lies just anterior to pituitary gland 3. damage to nerve, chiasm and tract will result in
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