Flashcards in Clinical anatomy of cranial nerves Deck (57):
What runs in the cribriform plate of the ethmoid bone?
What is the contents of the optic canal of the sphenoid bone?
Optic nerve and the ophthalmic artery
In what bone is the superior orbital fissure?
What runs in the SOF?
Superior ophthalmic vein
Inferior ophthalmic vein
What runs in the foramen rotundum?
What runs in the foramen ovale?
What runs in the internal acoustic meatus?
What runs in the jugular foramen?
Inferior petrosal sinus
Glossopharyngeal nerve, vagus nerve and spinal accessory nerve
In what bone is the internal acoustic meatus?
Petrous part of temporal bone
In what bone is the hypoglossal canal?
What runs in the hypoglossal canal?
What runs in the foramen magnum?
Anterior and posterior spinal arteries
What runs in the foramen spinosum?
Middle meningeal artery
Where will the optic nerve connect with the CNS?
Diencephalon at the lateral geniculate nucleus where it will then radiate to the visual cortex at the occipital lobe
How can the optic nerve be tested?
Acuity - snellen
Colour - ishihara
Where does the oculomotor nerve originate?
What are the contents of the cavernous sinus?
Ophthalmic branch of trigeminal nerve
Maxillary branch of trigeminal nerve
Internal carotid artery
Where does the trochlear nerve originate?
Where does the abducens nerve originate?
How are CN 3,4 and 6 tested?
H test - eye movements
Where does the vestibulocochlear nerve originate?
How is the vestibulocochlear nerve tested?
Describe rinne and weber testing?
Rinne - hold infront of ear and then on mastoid. In conducive hearing loss, you will hear better when on mastoid whereas in sensorineural you will hear better in air
Weber - hold tuning fork on head - sensorineural it will lateralise to normal ear but in conduction it will go towards affected ear
Where does the spinal accessory nerve originate on the CNS?
Cervical spinal cord - top 4 segments
How is the spinal accessory nerve tested?
Shug shoulders = trapezius
Turn head to flex neck and turn head towards opposite side
Where does the hypoglossal nerve connect with the CNS?
Via many rootlets lateral to the pyramids of the medulla oblongata
Where will the hypoglossal canal descend?
Lateral to the carotid sheath
At level of hyoid, tuns anteriorly towards lateral aspect of tongue
What is the medullary olive?
Inferior olive - cerebellar system
Superior orlive - pons and part of the auditory system, aiding the perception of sound
What innervates the palatoglossus muscle?
How is the hypoglossal nerve tested?
Stick tongue straight out
If there is unilateral pathology - the tongue tip will point towards the injured nerve
The Tongue tells the Truth
Which division of the trigeminal nerve provides sensory and motor innervation?
Only mandibular division
What part of the brain does the trigeminal nerve come off?
Where does the trigeminal nerve run in the brain?
Inferior to edge of tentorium cerebelli between post and middle cranial fossa
What type of neurones will the trigeminal sensory have?
Pseudounipolar = SENSORY NEURONES
What is the sensory distribution of CN V1?
Cornea (corneal reflex)
Skin of root/bridge/tip of nose
What is the sensory distribution of CN v2?
Skin of lower eyelid
Skin over maxilla
Skin over ala of nose
Skin of upper lip
What is the sensory distribution of CN V3?
Skin over mandible and TMJ
What supplies the angle of the mandible?
Greater auricular nerve; C2,3
What is the deep sensory territory of V1?
Bones and soft tissues of orbit
Upper anterior nasal cavity
Paranasal sinuses except the maxillary sinus
Anterior and posterior cranial fossa
What is the deep sensory territory of V2?
Lower posterior nasal cavity
Maxilla and maxillary sinus
Floor of nasal cavity/ palate
Maxillary teeth and assoc soft tissues
What is the deep sensory territory of V3?
Middle cranial fossa
Anterior 2/3rds of tongue
Floor of mouth
What is the CN V3 motor supply?
Tensor veli palatini
Where does the facial nerve connect to the CNS?
What is the course of somatic motor facial nerve axons?
Pass through internal acoustic meatus and then through the stylomastoid foramen
Pass into the parotid gland to then supply muscles of facial expression
What is the action of the chorda tympani?
Taste buds to anterior 2/3rds of tongue
Parasymp to submandibular and sublingual glands
What muscle in the inner ear does the facial nerve supply?
What is the function of the lingual nerve?
V3 to supply general sensation to the anterior 2/3rds of the tongue
What are the muscles of facial expression?
Elevators of lips
Where does the glossopharyngeal nerve originate on the CNS?
What is the general sensory actions of the glossopharyngeal nerve?
Posterior 1/3rd of tongue
Mucosa of most of nasopharynx and oropharynx
Mucosa of some of laryngopharynx
Middle ear cavity
What is the special sensory action of the glossopharyngeal nerve?
Vallate papillae on post 1/3rd of tongue
What is the parasymp action of the glossopharyngeal nerve?
What are the visceral afferent actions of the glossopharyngeal nerve?
Carotid body chemoreceptors
What is the somatic motor action of the glossopharyngeal nerve?
Where does the vagus nerve connect with the CNS?
Where will the vagus nerve run within the neck?
Within the carotid sheath
Posterior to and between the common carotid artery and internal jugular vein