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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/27/2009 for the course BIOL 240 taught by Professor Mcleod during the Spring '08 term at Kansas.

Page1 / 4

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online