H&N 3: Cranial Nerve Overview #2 Flashcards
Which nerves are involved in speech?
V, VII, X, XII
What are functions of XI + XII?
XI - shrugging shoulders
XII - movement + protrusion of tongue
Which structures are ass with ant. cranial fossa?
- cribiform plate: olfactory nerve, meninges
- optic foramen: optic nerve, opthalmic artery
Which structures are ass with middle cranial fossa?
- SOF (between greater + lesser wings of sphenoid): III, IV, V1, VI, opthalmic veins
What are the attachments of the optic nerve?
- lat geniculate nucleus - where optic radiation goes through fibres to visual cortex
Where does oculomotor nerve originate and what does it control?
- midbrain
- all extraocular muscles (except sup. oblique + lat. rectus) + levator palpebrae superioris
- pupillary constriction
Describe the course of oculomotor nerve
- passes between sup. cerebellar + post cerebral arteries
- pierces dura mater + runs along lat. wall of cavernous sinus
List the muscles of the eye that oculomotor supplies
- Levator palpebrae superioris
- Sup. rectus
- Inf. oblique
- Inf. rectus
List the muscle of the eye that trochlear supplies
Sup. oblique
What eye muscle does abducens supply and what is its function?
- motor supply to lat. rectus
- move eyes laterally (side to side)
List the nerves and vessels that come through: F. rotundum, F. ovale, F. spinosum, F. lacerum, Carotid canal + IAM
- F. rotundum - maxillary V2
- F. ovale - mandibular V3
- F. spinosum - middle meningeal artery
- F. lacerum - crossed by int. carotid artery
- Carotid canal - Int. carotid
- IAM - VII, VIII, labryrinthine artery
Where does sensory fibres of intracranial region come through?
SOF
What gives fibres to upper and lower teeth?
- upper: sup. alveolar nerves
- lower: inf. alveolar nerve
Where do fibres from the motor cortex in the brain go to?
- through thalamus down to pontine trigeminal nucleus of CN V
- then sends motor fibres to muscles of mastication
What are the functions of the facial nerve?
- controls muscles for used for facial expression
- stimulates salivary glands to produce saliva
Where is the facial nerve located?
- just below ear + passes through parotid (salivary) canal
What are some parts of the facial nerve that carries sensation?
- part carries sensation from outside of ear
- part carries taste sensations from ant. 2/3 of tongue
List motor branches of facial nerve to muscles of facial expression
- Temporal
- Zygomatic
- Buccal
- Mandibular
- Cervical
Is there a phys passage between IAM + EAM?
no
Which nerves come through the jugular foramen and its associations?
- IX, X, XI
- inf. petrosal sinus
- sigmoid sinus
Which nerves come through the hypoglossal foramen + foramen magnum?
- hypoglossal foramen: XII
- foramen magnum: midbrain runs sup. through opening to join with diencephalon
- vert artery, XI (spinal), meninges, CSF
What is glossopharyngeal sensory and motor to?
- sensory to oropharynx, post. part of tongue, tonsil
- motor component to stylopharyngeus, pharyngeal musculature
What does the vagus nerve control, and where does it go?
- para + motor control of lungs, heart + viscera
- most nerve fibres are sensory, communicating state of viscera to brain
- goes to every internal organ
What does the accessory nerve supply?
- SCM
- trapezius
