Flashcards in Quiz 8 (exam 2) Deck (82):
The olfactory nerve is not a true cranial nerve as it is actually part of the ____
What nerve passes through the cribriform plate?
Olfactory fibers. These branch off of the olfactory bulb (part of the olfactory nerve)
The optic nerve is not a true cranial nerve as it actually part of the ___
Which cranial nerve has a chiasm?
Optic nerve. Some fibers cross at the chiasm, some do not.
After fibers from the ____ nerve pass through the chiasm to go back towards the brain, where do they run?
2) optic tract (wraps around the brain stem)
The optic nerve leaves the orbit via the ____
The oculomotor nerve serves all ocular muscles besides what two muscles?
What is the only cranial nerve that crosses relative to its nuclei?
What muscle does the abducens nerve innervate?
What nerve does the trochlear nerve innervate?
Name all 7 muscles that the oculomotor nerve innervates
Lavatory palpebrae superioris
Pupillary sphincter (visceral)
Ciliary muscle (visceral)
The oculomotor nerve enters the orbit via the ____.
Superior orbital fissure
How does the trochlear nerve enter the orbit?
Superior orbital fissure
What is the only nerve to emerge from the dorsal surface?
What are the three branches off of the trigeminal nerve?
What are some things that the trigeminal nerve innervates?
Muscles of mastication
Oral floor muscles
Tensor tympani (middle ear)
Tensor veil palatini (pharyngeal)
If you pick your nose, what branch of the trigeminal senses that area?
What branch of the V senses stuff in the nasopharynx?
What nerve is responsible for sensation (not taste) of the anterior 2/3 of the tongue?
Mandibular branch of V
What nerve is responsible for sensation and taste of the posterior 1/3 of the tongue?
The facial nerve hitch-hikes with the trigeminal nerve. What branches does it hitch-hike? What does it innervate?
V2 and V3 to get to the glands of the face (except for the parotid)
What nerve innervates the parotid gland? What branch of trigeminal does it hitch-hike with?
Glossopharyngeal. Hitch-hikes with V3
How does the ophthalmic nerve get to where it needs to go?
Goes through the superior orbital fissure to get to the supraorbital notch
How does the maxillary branch get to where it needs to go?
Goes through the foramen rotundum.
What are the branches of the ophthalmic branch?
True or false... The lacrimal nerve from the ophthalmic branch has motor and sensory functions
False. It only has sensory function
What nerves branch from the maxillary branch?
Post/mid/ant. Superior alveolar
How does the mandibular branch get to where it needs to go?
What nerves branch off of the mandibular branch? (7)
Deep temporal branch
what two nerves runs medial to the mandible?
Lingual and chorda tympani
What nerve gives taste sensation to the anterior 2/3 of tongue?
What nerve enters the mandibular foramen?
What muscle innervates the anterior belly of the digastric, pulp of the teeth, and branches into the mental nerve for skin and lip afferents?
Inferior alveolar nerve
What branches off of the facial nerve? (7)
Nerve to stapedus
What branch of the facial nerve innervates the nasal and lacrimal glands? How does it get there?
The greater petrosal nerve hitch-hikes with V2
What nerve innervates the salivary glands except for the parotid.
Chorda tympani nerve
What nerve has vestibular and hearing senses?
How does the glossopharyngeal nerve exit?
What nerves gives taste sensation to the posterior 1/3 tongue and goes to the chemo and baroreceptors?
Glossopharyngeal and vagus
What nerve gives sensation to the outer and middle ear? (Including the tympanic membrane)
What nerve gives taste sensation to the epiglottis/
What three nerves exit the jugular foramen?
What is the pathway of the accessory nerve?
Ascends the cord into the skull via foramen magnum. Then exits the jugular foramen
What nerve gives motor function to the tongue?
How does the hypoglossal nerve exit? What artery runs along with it?
What CN have motor function only?
3, 4, 6, 11, 12
What CNs have sensory function only?
1, 2, 8
Where is Brocha's area located? What does it do?
Located anterior to the motor cortex of the frontal lobe. Involved in speech.
What is Wernicke's area? Where is it located?
Wernicke's area is posterior to the sensory portion of the parietal lobe. It serves to process language
What artery goes through the Silvian fissure of the brain?
Middle cerebral artery
What may happen if blood flow to the posterior cerebral artery is suppressed?
Loss of vision (it goes to the occipital lobe)
What artery is just inferior to the posterior cerebral artery?
Superior cerebellar artery
What three arteries serve the cerebellum?
Anterior inferior cerebellar
Posterior inferior cerebellar
The anterior communicating artery is in between what two arteries?
Right and left anterior cerebral arteries
What CNs are in the Midbrain?
oculomotor and Trochlear
What CNs are in the pons?
CNs 5, 6, 7, 8
What cranial nerves arise from the medulla?
What nerve, and portion of the brain stem, is involved with the pupillary light reflex?
Midbrain. Oculomotor nerve
What nerves, and portion of the brain stem, is involved in the corneal reflex?
Pons. Trigeminal senses it, Facial nerve causes muscle contraction
What nerve, and portion of the brain stem, is involved in the gag reflex?
Medulla, glossopharyngeal nerve senses it, glossopharyngeal and vagus nerve cause muscle contraction
What artery supplies the mesencephalon?
Posterior cerebral artery
What artery supplies the metencephalon (pons)?
Basilar artery (almost entirely)
Anterior Inferior Cerebellar artery
Some superior cerebellar
What arteries supply the medulla?
Anterior spinal artery (runs in between the vertebral arteries)
What artery does the posterior inferior cerebellar artery come off of?
What artery does the superior cerebellar artery come off of?
What artery does the posterior cerebral artery come off of?
Posterior communicating artery
What structure separates the two hemispheres of the brain?
What two portions of the brain does the tentorium cerebelli separate?
Occipital lobe and cerebellum
How does the middle meningeal artery enter the brain?
What is the pterion?
Weak point in the temporal bone. if affected, it can in turn damage the middle meningeal artery
What nerve innervates the anterior digastric muscle and mylohyoid (specifically)?
Inferior alveolar nerve (branch of V3)
What nerve innervates the stylohyoid and posterior belly of digastric?
Branches of the facial nerve
What nerve innervates the parotid gland?
What nerve gives sensory INnervation to the middle ear, external ear, ear canal, and tympanic membrane?
When viewing the cranial nerves, are the sensory neveres more medial or lateral to the motor nerves?
Sensory are more lateral
What nerve is generally affected first due to a cavernous thrombosis?
Abducens. Won't be able to do lateral gaze of eye
What cranial nerves are found within the cavernous sinus?
What brain structure is also in the cavernous sinus?
What are the veins that drain the scalp NAD enter the skull?
Parietal and occipital emissary veins
A torn middle meningeal artery can result in....
An epidural hematoma
Define epidural hematoma
Potential space between dura and skull fills with blood