Page 30 - Edited - Webster HEAD AND NECK - part 2-Merge PDF

HN 228

TASTE AND SALIVATORY REFLEX & CONTROL - 1

A. TASTE.
THALAMUS
ASCENDING
AXONS
CEREBRAL CORTEX
- AWARENESS
OF “TASTE”
i.e. MOLECULES
IN ORAL CAVITY

SOLITARY
NUCLEUS
PONS
4
SENSORY GANGLION
(ASYNAPTIC)
PALATE

T ONGUE SENSORY
GANGLION MEDULLA
(ASYNAPTIC)

B. EFFERENT CONTROL OF
SALIVATION (1)
HYPOTHALAMUS
CEREBRAL
CORTEX:
SIGHT, SMELL
OR THOUGHT
OF FOOD WILL
ENHANCE SALIVATION SOLITARY NUCLEUS
PROVIDED CIRCUMSTANCES ARE SENDS REFLEX
RIGHT e.g. You ARE HUNGRY; ARC AFFERENT
INFORMATION
YOU ARE HEALTHY (THINK OF TO SALIVATORY
WHAT HAPPENS WHEN YOU HAVE NUCLEI OF
GASTRITIS, OR ARE SEA-SICK; OR HINDBRAIN
WHEN YOU ARE FRIGHTENED cf.
-SEE).

HINDBRAIN
SALIVATORY NUCLEI
(....)

NOTE 1. THE GLOSSOPHARYNGEAL NERVE IS SECRETO-MOTOR

TO THE PAROTID SALIVARY GLAND. 2. THE FACIAL NERVE IS SECRETO-
MOTOR TO THE SUBMANDIBULAR & SUBLINGUAL SALIVARY GLANDS AN TO THE MAJORITY
OF THE MINOR SALIVARY GLANDS OF THE TONGUE, PALATE, INNER LIPS etc. 3. THE
SECRETOMOTOR EFFECTS ARE AUGMENTED BY LOCAL RELEASE OF METABOLITES e.g.
DILATING ARTERIOLES IN THE GLANDS. 4. THE POSTSYNAPTIC RECEPTORS IN THE
GLANDULAR TISSUE ARE MUSCARINIC & THEREFORE BLOCKED BY ATROPINE, AND BY DRUGS
WITH ATROPINE-LIVE SIDE EFFECTS.
K.E.W.