Download SENSORY INNERVATION OF HEAD

MINI-REVIEW: SENSORY INNERVATION OF HEAD: TOUCH, PAIN, TEMPERATURE, TASTE
1 - Sensory ganglia (no synapses only cell bodies) - V has Trigeminal (Semilunar ganglion); VII has
Geniculate ganglion; (Note: exception not mentioned in video: Mesencephalic nucleus of V has sensory cell
bodies located in CNS).
2- Sensory Innervation of Skin
AREA
Skin of Face,
Forehead: V
(Trigeminal)
DETAILS
face and forehead above
lateral margin of eye
CLINICAL
Test: Two point discrimination
and touch to forehead
Skin of Outer Ear
NERVE
V1 Ophthalmic
(Superior Orbital
Fissure)
V2 Maxillary
(Foramen
Rotundum)
V3 Mandibular
(Foramen Ovale)
V,VII,IX,X
between lateral margin of
eye and lateral margin of
mouth
lateral margin of mouth to
edge of mandible
External auditory meatus
Back of Head
and Neck
Cervical Spinal
Nerves
Cervical plexus (C2-C4)
anterior and lateral; dorsal
primary rami posterior side
Test: Two point discrimination
and touch to skin of cheek below
eye
Test: Two point discrimination
and touch to lower lip and jaw
Ear ache in Bell's palsy from VII
sensory
Anesthesia, pain with cervical
nerve damage
3- Reflexes to Touch - Cornea is precise touch V; Pharynx is visceral, imprecise IX
REFLEX
ELICIT BY
Corneal
Reflex
Touch cornea of
eye (outer surface)
Gag
Reflex
Touch oropharynx
or soft palate
SENSORY
NERVE
(IN)
V1
Ophthalmic
IX
MOTOR NERVE (OUT)
CLINICAL/RESPONSE
VII - to Orbicularis oculi
muscle (facial
expression)
X - to Pharyngeal
Constrictor muscles,
muscles of palate
Close eyelids; response
is bilateral
Gagging; rapid
contraction of muscles
of pharynx
4- Sensory Innervation of Tongue - Touch, Pain, Temperature vs Taste
Area of Tongue
TOUCH, PAIN,
TEMPERATURE
NERVE FOR TOUCH PAIN,
TEMPERATURE
NERVE FOR
TASTE
Anterior 2/3 of tongue
(Oral part of tongue)
Precise localization
(GSA)
Trigeminal V3 Lingual
Nerve
Facial VII
Chorda
tympani
Posterior 1/3 of tongue
(Pharyngeal part of
tongue)
Imprecise localization
(GVA)
Glossopharyngeal IX Lingual
branches
Glossophary
ngeal IX
Lingual
branches
Area Anterior to Epiglottis
(Pharyngeal part of
tongue)
Imprecise localization
Vagus X
Vagus X
(GVA)