Neuroanatomy Draw It To Know It

13. Cranial Nerves 5, 7, 9, 10 229

DRAWING 13-8 Th e Gag Refl e x

THE GAG REFLEX

Sensory Loop

(WEAK)

(STRONG) (WEAK)

Motor Loop

Soft palate

stimulus

CrN 9 Spinal trigeminal

nucleus or

Solitary tract

nucleus

Nucleus ambiguus

Motor trigeminal

nucleus

Hypoglossal nucleus

Pharyngeal

constriction

Jaw opening

Tongue thrust

CrN 10

CrN 5

CrN 12

Nucleus ambig.

Cortico

nuclear

Palate

(STRONG)

NORMAL

CORTICONUCLEAR

INNERVATION

Upper motor

neuron injury

Lower motor neuron injury