Neuroscience - exam3 - Chapter 12 - Cranial Nerves

xijebuha's version from 2015-10-15 02:43

Section 1

Question Answer
the dorsal side of the spinal cord (alar plate) is where what type of info enters?sensory
the ventral side of the spinal cord (basal plate) is where what type of info exits?motor
somatic or visceral info lies further from the central canal or sulcus limitans?somatic
somatic or visceral info lies closer to the central canal or sulcus limitans(intermediate horn)?visceral
what type of info only comes from spinal nerves T1-L3 or S2-S4?visceral
which type of cranial nerves are for voluntary motor?general somatic efferent (GSE)
which type of cranial nerves are for conscious sensory, easily localizedgeneral somatic afferent (GSA)
which type of cranial nerves are for involuntary motor, autonomic, visceral motor?general visceral efferent (GVE)
which type of cranial nerves are for unconscious sensory, visceral sensory?General Visceral Afferent (GVA)
which cranial nerves are GSE?III, IV, VI, XII
which cranial nerves are GSA?V
Which cranial nerves are GVE?III, VII, IX, X
Which cranial nerves are GVA?VII, IX, X
brachial motor neurons are the same as...GSE neurons but have distinct locations in the brain stem
brachial motor neurons are for...voluntary face/pharynx motor
all brachial motor neurons innervate...striated muscle of brachial arch origin
which muscles are innervated by brachial motor neurons?muscles of larynx, pharynx, jaw, and face
which CN are branchiomeric?V, VII, IX, X, XI
Special somatic afferent (SSA) nerves are for...special senses (vision, hearing, smell, head proprioception (vestibular)
which cranial nerves are SSA?I, II, VIII
motor or sensory nerves cross before the nucleus and then synapse?motor
motor or sensory nerves synapse at the nucleus and then cross?sensory

Section 2

Question Answer
CN IOlfactory
CN IIOptic
CN IIIOcculomotor
CN IVTrochlear
CN VTrigeminal
CN VIAbducens
CN VIIFacial
CN VIIIAuditory
CN IXGlossopharyngear
CN XVagus
CN XIAccessory
CN XIIHypoglossal

Section 3

Question Answer
Which is the only nerve to go directly to the cortex?CN I
What type of nerve is CN I?SSA
is CN I sensory or motor?sensory
CN I is for...smell
lesions of CN I cause...anosmia (lack of smell) or olfactory hallucinations
CN II is what type of nerve?SSA
is CN II sensory or motor?sensory
CN II is
lesions of CN II will cause...deficits in visual field, partial or total blindness
CN III is for...extrinsic eye muscles, lens, and pupils
CN III is what type of nerve...GSE, GVE
CN III controls what muscles bilaterally?levator palpebrae superioris (opens eye lids)
CN III controls what muscles C/L?superior rectus (moves eye up and adducts medially)
CN III controls which muscles I/L (as a GSE)?medial rectus (adducts eye medially), inferior rectus (moves eye down and adducts medially), inferior oblique (moves eye up and abducts, laterally)
CN III controls which muscles I/L (as a GVE)?pupillary sphincter (contricts pupil), ciliary muscle (changes lens shape, allows for close vision)
Lesions of CN III cause deficits on which side?I/L
Lesions of CN III cause...lateral strabismus, impaired vertical eye movement, diplopia, ptosis, mydriasis, problems viewing near objects
lateral strabismus is...paralysis of medial rectus - gaze deviates laterally, can't look medially
What is diplopia?double vision
What is ptosis?paralysis of levator palpebrae - drooping eyelid
What is mydriasisdisrupted pupillary response - dilated pupil

Section 4

Question Answer
CN IV - motor or sensory?motor
CN IV innervates what muscle?supior oblique muscle (moves eye down and laterally abducts)
CN IV is what type of nerve?GSE
What are 2 unique features of CN IV?it is the only CN to originate entirely from C/L side and exits the dorsal aspect of the brain
Why are lesions of CN IV difficult to detect?awkward orientation
lesions of CN IV cause...C/L effects if the nucleus is damaged, diplopia especially after reading or going downstairs
CN V is what type of nerve?GSE, GSA
CN V is for...facial touch, proprioception, pain, and temperature and muscles of mastication
What are the 3 divisions of CN V?Opthalmic, Maxillary, Mandibular
the Opthalmic division of CN V is for...cornea and forehead sensation
the Maxillary division of CN V is for...upper jaw sensation
the Mandibular division of CN V is for...lower jaw sensation and muscles of mastication
the main sensory mucleus of CN V is for head touch, conscious jaw proprioception
Sensory projections of CN V for touch and proprioception cross from ______________ side to project through ____________________ to ___________________ of the thalamus.C/L, medial lemniscus, VPM
Pain and temp info of CN V travels through which tract and where does it travel to??spinal trigeminal tract, travels to spinal nucleus in caudal medulla
pain info of CN V crosses to C/L _______________ tract to ascend to the thalamus.spinothalamic
the spinal nucleus of CN V is for...pharyngeal touch and pain and head pain
caudally, the spinal nucleus of CN V blends with...posterior horn
the motor mucleus of CN V is a...LMN to masticators
the mesencephalic nucleus of CN V is for...jaw jerk, stretch, and deep tendon reflexes
the mesencephalic nucleus of CN V receives afferent info from what receptors?muscle spindles of muscles of mastication, mechanoreceptors of the gums, teeth, and hard palate
the jaw jerk reflex is...downward tap causes bilateral contraction of muscles of mastication
the jaw-jerk reflex is what type of reflex?monosynaptic
lesions of CN V can cause...facial anesthesi (onion skin distr. around mouth), altered perception of pain (trigeminal neuralgia), difficulty chewing
the farther caudal the lesion of CN V...the larger the area surrounding the mouth is spared
brief attacks of trigeminal neuralgia (< 1 min) means...distribution of 1 division
most cases of trigeminal neuralgia are caused by...compression of the trigeminal nerve
What type of nerve is CN VIGSE (motor)
CN VI innervates...lateral rectus muscle (laterally abducts eye)
What wraps around the abducens nucleus?I/L facial neurons
lesions of CN VI can cause medial strabismus (eye deviates medially) becaue of paralysis of I/L lateral rectus muscle, diplopia, cross-eyed look
when the right lateral rectus muscle contracts, the left medial rectus muscle...also contracts
internuclear ophthalmoplegia (I/L medial eye movement deficits) is caused by...damage to MLF because the MLF interconnects CN 3, 4, and 6 for eye movements
lesions to nucleus of CN VI will cause....lateral gaze paralysis I/L eye will not abduct, C/L eye will not adduct