Cranial Nerves Flashcards
How many pairs of cranial nerves?
12
Which nerves have nuclei in the brainstem?
CN 3-12
What are the 12 nerves?
Olfactory Optic Oculomotor Trochlear Trigeminal Abducent Facial Vestibulocochlear Glossopharyngeal Vagus Spinal accessory Hypoglossal
The trochlear nerve comes off where?
Posterior dorsal brainstem
Vestibulocochlear nerve is sensory or motor?
Only sensory
Anterior cranial fossa
Foramina of cribriform plate
bulbs from the Olfactory Nerves (CN 1)
Middle cranial fossa
Optic canal superior orbital fissure Foramen rotundum Foramen ovale Foramen spinosum Foramen lacerum
Optic canal
optic nerve (CN II) and opthalamic artery
Superior orbital figure
oculomotor n. trochlear n. opthalamic n. abducent n. ophthalmic veins
Foramen rotundum
Maxillary nerve (CNv2)
Foramen ovale
mandibular nerve (CNv3)
Foramen spinosum
middle meningeal artery and vein
Foramen lacerum
internal carotid artery
passing horizontally
Posterior cranial fossa
Internal acoustic meatus
Jugular foramen
Hypoglossal canal
Foramen magnum
Internal acoustic meatus
Facial n. (CN VII) Vestibulocochlear n. (CN VIII)
Jugular foramen
Glossopharyngeal n. (CN IX)
Vagus n. (CN X) Spinal accessory n. (CN XI)
Internal jugular vein
Hypoglossal canal
hypoglossal nerve CNXII
Foramen magnum
Medulla and meninges
Spinal root CNXI
Vertebral arteries
Sensory (afferent)
Somatic sensory (general sensory) Visceral sensory (general visceral afferent) Special sensory
Example of somatic sensory
CN V
Example of visceral sensory
CN X
Example of special sensory
CN II
somatic sensory
touch, pain, pressure, temperature, proprioception
visceral sensory
reflex or pain sensation from viscera, glands, and blood vessels
special sensory
hearing, balance, vision, olfaction
Motor (efferent)
somatic motor
visceral motor
Somatic motor
innervation of skeletal muscles
CNVII
Visceral motor
innervation of smooth muscle
CNX
Motor is ___ and sensory is ____
motor is medial and sensory is lateral
What do branchiomotor fibers innervate?
Innervate striated muscle under voluntary control
Why are branchiomotor fibers considered visceral?
Develop in association with the cranial (proximal) end of the gut tube —the brachial arches
Is there an equivalent to branchiomotor fibers?
There is no equivalent in the trunk and limbs
What is the innervation of branchial arch muscles?
Branchiomotor nerves
Cranial nerves carry three types of motor fibers
Somatic motor fibers
Branchiomotor fibers
Autonomic fibers
Somatic motor fibers
Somatic striated muscles and voluntary
Somatic motor voluntary nucleus
Oculomotor
Trochlear
Abducens
Hypoglossal
Branchiomotor voluntary nucelus
Trigeminal Facial
Nuc. Ambiguus
Cervical Accessory Nuc
