Basics Flashcards
Olfactory: exit
Cribiform plate (ethmoid bone)
Olfactory: number
CN 1
CN 1: name
Olfactory
Optic: function
Special sense: sight
Optic: exit
Optic canal- sphenoid bone
CN II: name
Optic
optic: number
CN II
Occulomotor: number
CN III
CN III: name
Occulomotor
Occulomotor: function
Motor- extraoccular muscles except superior oblique and lateral rectus
Occulomotor: exit
Superior orbital fissure
CN IV:name
Trochlear
Trochlear: number
CN IV
Trochlear: function
Motor: superior oblique muscle
Trochlear: exit
Superior orbital fissure
CN V: name
Trigeminal
Trigeminal: number
CN V
Trigeminal: branches
V1: ophthalmic
V2: maxillary
V3: mandibular
Trigeminal: function
Sensory: skin of face and mucous membranes and sinuses
V3: also motor- muscles of mastication and tensor tympani
Trigeminal: exit
V1: superior orbital fissure
V2: foramen rotundum (then superior orbital fissure)
V3: foramen ovale
CN VI: name
Abducens
Abducens: number
CN VI
Abducens: function
Motor- lateral rectus muscle
Abducens: exit
Superior orbital fissure
CN VII: name
Facial
Facial: number
CN VII
What’s the difference between facial nerve and CN VII?
“Facial nerve proper” means the motor portion. CN VII also has greater petrosal (carries parasympathetic fibres) and special sense (chorda tympani) branches before exiting skull.
Facial: route and branches
Motor and sensory roots fuse (=geniculate ganglion) then gives off 3 interracial branches (greater petrosal nerves, nerve to stapedius and chorda tympani)
(Exits at stylomastoid foramen)
3 motor branches (posterior auricular, nerve to digastric, nerve to stylohyoid)
Then last 5 branches:
- temporal
- zygomatic
- buccal
- marginal mandibular
- cervical
CN VIII: name
Vestibulocochlear
Vestibulocochlear: number
CN VIII
Vestibulocochlear: function
Special sense: hearing (+ balance)
Vestibulocochlear: exit
Internal acoustic meatus (temporal bone)
Facial: function
Motor: muscles of facial expression, stapedius, post. belly of digastric, and stylohyoid
Special sense: anterior 2/3 of tongue
Glossopharyngeal: number
CN IX
CN IX: name
Glossopharyngeal
Glossopharyngeal: function
Sensory: Middle ear, eustacian tube, carotid body and sinus, oropharynx and post. 1/3 of tongue, palatine tonsils
Special sense: post. 1/3 of tongue
Motor: stylopharyngeus
Glossopharyngeal: exit
Jugular foramen
Vagus: number
CN X
CN X: name
Vagus
Vagus: function
Sensory: laryngopharynx, larynx, oesophagus, external ear, aortic arch and body, thoracic and abdominal viscera
Motor: soft palate, pharynx, larynx, upper oesophagus
Vagus: exit
Jugular foramen
CN XI : name
Spinal accessory
Spinal accessory: number
CN XI
Spinal accessory: function
Motor: trapezius and sternocleidomastoid
Spinal accessory: exit
Jugular foramen
Hypoglossal: number
CN XII
CN XII: name
Hypoglossal
Hypoglossal: function
Motor: extrinsic and intrinsic muscles of tongue
Hypoglossal: exit
Hypoglossal canal
Olfactory: function
Special sense- olfaction
