Download Lecture Cranial Nerves 1

Gross Anatomy:
Cranial Nerve Introduction
(Grays, pages 807; 848-854)
Vocabulary REVIEW
CNS
1.
Afferent:
• sensory
• primary afferents
• axons entering the CNS
• cell bodies in sensory ganglia
• CN versus spinal nerves
2.
Efferent:
• motor
• leaving the CNS
• innervate skeletal muscle or
viscera
• visceral efferent pathways
always involve 2 neurons [one in
the CNS and one in a peripheral
ganglia]
Functional Components
•
•
•
•
Special
General
Somatic
Visceral
– cranial nerves only; olfaction, vision, taste, balance and hearing
– touch, pressure, proprioception, vibration, pain and temperature
– body wall
– smooth and cardiac muscle, glands and arrector pili
General Somatic Afferent (GSA):
General Visceral Afferent (GVA):
Special Visceral Afferent (SVA):
Special Somatic Afferent (SSA):
General Somatic Efferent (GSE):
General Visceral Efferent (GVE):
Branchial Efferents (BE [SVE]):
sensation from body wall
sensation from viscera
taste and olfaction
DON’T NEED TO KNOW YET
motor; to skeletal muscle
motor to “viscera”
motor (skeletal muscle from pharyngeal arches)
CRANIAL NERVE SUMMARY
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Olfactory
Optic
Oculomotor
Trochlear
Trigeminal
Abducens
Facial
Vestibulocochlear
Glossopharyngeal
Vagus
Accessory
Hypoglossal
CN I
CN II
CN III
CN IV
CN V
CN VI
CN VII
CN VIII
CN IX
CN X
CN XI
CN XII
(SVA)
(SSA)
(GSE, GVE-P)
(GSE)
(GSA, BE)
(GSE)
(BE, GSA, SVA, GVA, GVE-P)
(SSA, SSE)
(BE, GSA, SVA, GVA, GVE-P)
(BE, GSA, SVA, GVA, GVE-P)
(GSE)
(GSE)
Sensory
Sensory
Motor
Motor
Both
Motor
Both
Sensory
Both
Both
Motor
Motor
Cranial Nerves along the Cranial Fossa
I.
II.
III.
IV.
V.
VI.
VII.
VIII.
IX.
X.
XI.
XII.
Olfactory
Optic
Oculomotor
Trochlear
Trigeminal
Abducens
Facial
Vestibulocochlear
Glossopharyngeal
Vagus
Accessory
Hypoglossal
12 Cranial Nerves:
To the “intra” and extraocular muscles:
CN III – Oculomotor
CN IV – Trochlear
CN VI - Abducens
Brain stem
(CNS)
Brain stem
(CNS)
Brain stem
(CNS)
CN V - Trigeminal
CN V - Trigeminal Nerve
Ophthalmic
Maxillary
NOTE: The mesencephalic nucleus is involved in proprioception from muscles of mastication, the TMJ, extraocular muscles and muscles of the face.
CN V - Trigeminal
CN V1 - Ophthalmic
CN V2 - Maxillary
CN V3 - Mandibular
CN VII - Facial
CN VII - Facial Nerve
CN VII - Facial
Cranial Nerve VII
CN IX – Glossopharyngeal
CN X - Vagus
CN IX - Glossopharyngeal
CN IX - Glossopharyngeal
CN X - Vagus Nerve
CN X - Vagus Nerve
CN XI – Spinal Accessory
CN XII - Hypoglossal
CN XI - Spinal Accessory
CN XII Hypoglossal