Page 129 - Edited - Webster HEAD AND NECK - part 2-Merge PDF

NERVE COMPONENTS LOCATION OF CELL PERIPHERAL FUNCTION
BODIES OF FIBRES DISTRIBUTION

IX Glossopharyngeal Afferent (sensory)

[because it supp- i) Visceral Inferior glosso- Posterior third of tongue Chemoreception: Taste,
lies largely the (parasympathetic) pharyngeal ganglion Carotid body Blood pCO 2/[H ]
+
tongue (Greek: (asynaptic) in jugular monitoring
"glossa"), and foramen
pharynx] ii) Somatic Superior glosso- Posterior third of tongue, Touch, etc. Reflex control of

pharyngeal ganglion oropharynx and isthmus, swallowing cf "gagging" reflex
(asynaptic) middle ear cavity leading to vomiting

Efferent (motor)
i) Parasympathetic 1. Presynaptic axons from Parotid salivary gland Secretomotor -
cell bodies in brainstem Salivation
2. Cell bodies of post-
synaptic fibres in otic
ganglion
ii) Somatic Brainstem Skeletal muscle of Swallowing; modulation HN 318
upper pharynx; stylo- of phonation by varying

pharyngeus configuration of pharynx

X Vagus Afferent (sensory)
(Latin "wanderer" i) Somatic Superior vagal ganglion Mucous membrane of laryngo- Touch, pain, temperature.
because of its in jugular foramen pharynx, larynx and upper Protection of airways: reflex control
wide distribution (asynaptic) trachea or generation of swallowing,
c.f. English words coughing, gagging, etc.
"vagrant, vagabond".) ii) Visceral Inferior vagal ganglion Lower respiratory tree and Distension detection (Hering-Breuer
(parasympathetic) just below jugular foramen and lungs. reflex); reflex coughing

(asynaptic) Carotid sinus; Aortic arch; Blood pressure monitoring
abdominal veins
Gastro-intestinal tract to Detection of gut distension
splenic flexure and movements'

cranerv2 4