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77 Cards in this Set
- Front
- Back
Which structure sends motor fibers to innervate the muscles of the larynx and pharynx?
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Nucleus Ambiguous
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Neurons in this structure receive input from the red nucleus and the spinal cord
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Olive
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This fiber bundle contains cerebellar afferents arising from the spinal cod and brainstem.
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Inferior cerebellar peduncle – posteriorly and laterally
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What is an example of a general somatic nucleus? And Why?
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Hypoglossal nucleus – because they stay midline
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Lesion of which structure results in upper motor neuron paralysis?
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Pyramids
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Axons of neurons within this structure project to the cerebellum
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Olivocerebellar Tract
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This structure innervates the muscles of the tongue
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Hypoglossal nerve
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- Which statement describes the fibers that cross in the sensory decussation of the medulla oblongata?
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Originate in the nucleus cuneatus and gracilis
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Why is the spinal nucleus of the trigeminal nerve not likely to be damaged by a discrete vascular lesion of the ventral medulla?
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Because the nucleus is located laterally
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Name 5 effects of damage to the right oculomotor nerve.
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Eye deviates down & out.
Ptosis. Shine light on the ipsilateral side – no direct input, but you would have normal indirect pathway. Mydriasis. Loss of pupillary light reflex in the right eye when light is shone into the right or left eye, lateral strabismis. |
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Stroke leading to the Right oculomotor nerve problem and left hemiparesis would be where?
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Right basilar region in the midbrain area.
Right Cerebral Peduncle. |
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Pt. has a meningioma that has begun to compress the anterolateral portion of the mid-cervical spinal cord on the left side. Where do you expect to see a deficit in your pts perception of a pin prick (pain)?
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Right Lower Extremity
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Describe the effect of right optic nerve damage on the pupillary light reflex?
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o Damage to the afferent pathway – input pathway
o Therefore, you would lose both the involved and uninvolved eyes when light is shined into the involved side o Reflex would be normal though if the light was shined into the uninvolved side o Absent direct and consensual pupillary light reflex with light shone into right eye |
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What is not associated with basal ganglia dysfunction
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Intention Tremor
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Which cranial nerve arises from the preolivary sulcus?
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CN 12 - hypoglossal
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Which cranial nerves arise from the postolivary sulcus?
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CN 9(glossopharyngeal), 10(Vagus) & 11(Spinal Accessory)
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What cranial nerve arises from the medulla pons junction?
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CN 6 - Abducens & CN 7 - Facial
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From where does the vestibulocochlear(VIII) nerve arise?
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Cerebellar Pontine Angle
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Where does the Trigeminal(V)nerve arise?
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Rostral & Laterally from pons
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What type of fibers are found in teh Crus Cerebri?
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Cortigofugal Fibers
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What cranial nerve exits from the Interpeduncular Fossa?
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CN 3 - Occulomotor nerve
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Where can the Trochlear Nerve (CN 4) be found?
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Wraps around the posterior aspect of the brainstem. *only one that comes out of the dorsal aspect of brainstem
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What does SO4 LR6 stand for?
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Superior Oblique - CN4, Lateral Rectus - CN6
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What is the structure that could be called the bridge between the cerebellum, medulla & midbrain?
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Pons
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What is a common name for the mesencephalon?
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Midbrain
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Where are the cerebral peduncles located?
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Anterolateral portion of midbrain
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Where is the rhomboid fossa?
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the 4th ventricle
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What comes from arcuate nuclei from ventral pyramids?
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Stria Medullaris
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Name the bumps on the medulla overlying the nuclei gracilis.
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Gracile Tubercle
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What is the superficial bump on the medulla which overlies nucleus cuneatus (Lateral to the Gracile Tubercle)?
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Cuneate Tubercle
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What is the hypoglossal trigone?
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Surface projection of & overlies hypoglossal nucleus
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what is the Vagal Trigone?
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Overlies the dorsal motor nucleus of the vagus nerve.
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What does the facial colliculus overly?
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Abducens Nucleus
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Fibers from the facial motor fibers wrap around what?
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Abducens Nucleus
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What is the GENU?
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bend where facial fibers bend around
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What connects the cerebellum to brainstem?
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Cerebellar peduncles
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Which is the largest cerebellar peduncle?
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Middle
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Which is the major output cerebellar peduncle?
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Superior
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How does the dorsal spinocerebellar tract enter the cerebellum?
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through the inferior cerebellar peduncle
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What happens when the level of the obex is stimulated?
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causes vomitting
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What is the spinal tract of the inferior colliculus and what does it do?
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Lateral lemniscus... audition & auditory reflex
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What is the Superior colliculus important for?
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visual info from the retina & visual reflex.
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In the Neural Tube what is the the intermediate layer?
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gray matter
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In the neural tube, what is the outer marginal layer?
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White matter
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What does the alar plate differentiate into?
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Dorsal - sensory - General somatic afferent & general visceral afferent
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What does the Basal plate differentiate into?
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Ventral - motor - General visceral efferent & General somatic efferent
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What is the sulcus limitans?
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Separates the alar plate & basal plate in the neural tube
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Where is sensory nuclei found?
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laterally
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Where is motor nuclei found?
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medially
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GSE
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Somatic motor to striated muscle in orbit & tongue
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SVE
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Branchial Motor - innervate muscles of mastication, or others from face, larynx or pharynx
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GVE
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Visceral Motor - parasympathetic system - innervating smooth muscles & glands
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GVA
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visceral sensation from glands & organs - does not normally reach consciousness
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GSA
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General Sensory - touch, pressure, heat, cold from skin & mucous membranes - mainly thru CN5 (also 7,9 & 10)
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SSA
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special senses, vestibulocochlear, balance & orientation in space, audition, CN8
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What does the Rubrospinal tract do?
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Coordinated movement of distal flexors
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Nucleus Ambiguous is aka
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ventral motor nucleus of vagus
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What cranial nerves does the solitary nucleus receive info from?
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CN 7,9,10
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Rostral portion of solitary nucleus is for what?
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taste
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Caudal portion of the solitary nucleus is for what?
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cardiovascular & respiratory
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Pyramids have what kind of fibers?
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corticofugal fibers
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4 vessels that supply blood to the medulla
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anterior spinal artery
posterior spinal artery vertebral artery PICA - (posterior inferior cerebellar artery) |
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Signs of Medial Medullary Syndrome
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-deviation of the tongue to same side as problem
-2 pt discrimination, conscious proprioception, position & vibration problems -paralysis, peresis, weakness, hypertonicity, clonus, hyperactive reflexes |
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Tracts involved in Medial Medullary Syndrome
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Hypoglossal Nucleus
Medial Lemniscus Corticospinal Tract |
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Lateral Medullary Syndrome AKA
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Wallenberg Syndrome
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Where is the lesion in Lateral Medullary Syndrome
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lateral portion of the medulla
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Symptoms of Lateral MEdullary Syndrome
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-deficit of pain & temp on contralateral side
-in FACE deficit of pain & temp on ipsilateral side -deficit on one side of the palate & deviation to the other side -hoarse voice, hiccups, difficulty swallowing, deficit in gag reflex -vertigo nausea vomiting nyst - ataxia, gait, fall to ipsilateral side |
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Pons contains which cranial nerve nuclei?
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5,6,7,8
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SVA
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Special Sensory - sensations of taste & smell & serve senses of vision, hearing & balance
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Location of Striae Medullares
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Separates the medulla from the pons
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Function of the cerebellar Peduncles
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connect cerebellum to brainstem
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What type of info does the Inferior Colliculus contain?
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Auditory
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What type of info does the Superior Colliculus contain?
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Vision
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Lateral Lemniscus is what type of info?
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auditory info
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4 types of Corticofugal fibers (fugal=away from)
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-Corticospinal
-Corticobulbar -corticoreticulobulbar -corticopontine |
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Tectospinal Tract function
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orients the head & neck
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Trapezoid body
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auditory info
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