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NWHSU Dr T CNS2 exam
NWHSU CNS 2 exam material for Dr. T's test - Pons, midbrain, cerebellum
| Question | Answer |
|---|---|
| What is the function of the pyramidal tract? | Mediates voluntary control of movement of limbs and motor functions of CN IX, X, & XII |
| What is the function of the medial lemniscus? | Transmits conscious proproception, pain, & temp from body to thalamus |
| What is the function of the MLF? | Regulates position of the eyes in response to vestibular input |
| What is the function of the descending tract of CN V? | Mediating somatosensory sensation from head to brain |
| What is the function of the Lateral Spinothalamic Tract? | Mediates pain and temperature from body |
| What is the function of the trapezoid body? | mediates auditory signals from cochlear nuclei to superior olivary nucleus |
| What is the function of the Rubrospinal tract? | facilitates flexor motor neurons |
| What is the function of the Medial Reticulospinal tract? | Facilitates muscle tone |
| What is the function of the transverse pontine fibers? | Mediates fibers from deep pontine nucleui to cerebellum |
| Effects of Lesion in: pyramidal tract | upper moton neuron paralysis affecting limbs, disruption of motor functions from CN IX, X, XII |
| Effects of Lesion in: Medial lemniscus | loss of conscious proprioception, some pain and temp loss, some ataxia |
| Effects of Lesion in: MLF | impaired adduction of eye contralateral to lesion, nystagmus |
| Effects of Lesion in: lateral spinothalamic tract | loss of pain and temp from opposite side of body |
| Effects of Lesion in: trapezoid body | auditory deficits |
| Effects of Lesion in: rubrospinal tract | Unknown |
| Effects of Lesion in: Descending tract of CN V | loss of pain and temp from ipsilateral head |
| Effects of Lesion in: medial reticulospinal tract | unknown, but possible hypotonia |
| Effects of Lesion in: transverse pontine fibers | unknown, possibly affect coordination of purposeful movement |
| What is the function of the vestibular nuclei? | transmits vestibular: inputs to: spinal cord, CN nuclei mediating eye movement, and cerebellum |
| What is the function of the deep pontine nuclei? | mediates input from cerebral cortex to cerebellar cortex |
| What is the function of the reticular formation? | sleep and wakefullness, sensory, motor, and autonomic functions |
| What is the function of the abducens nucleus (CN VI)? | mediates lateral movement of the ipsilateral eye |
| What is the function of the facial nucleus and nerve (CN VII)? | mediates facial expression, superior salivary nucleus |
| What is the function of the main sensory nucleus (CN V)? | mediating somatosensory sensation from the head regions to thalamus |
| What is the function of the Motor nucleus of CN V? | mediates muscles of mastication |
| What is the function of the mesencephalic nucleus (CN V)? | mediates unconscious sensation (mostly from muscles spindles of jaw) to cerebellum and motor nucleus of CN V |
| What is the function of the nucleus locus ceruleus and raphe nuclei? | origin of norepinephrine and serotonin innervations, respectively |
| What is the function of the solitary nucleus? | mediates cardiovascular functions and relay nucleus for taste inpulses |
| Effects of Lesion in: vestibular nuclei | nystagmus, impaired adduction of eye contralateral to lesion, possible ataxia |
| Effects of Lesion in: deep pontine nuclei | unknown, possibly affect coordination of purposeful movements |
| Effects of Lesion in: reticular formation | loss of consciousness |
| Effects of Lesion in: abducens nucleus (CN VI) | inability of ipsilateral eye to abduct, strabismus |
| Effects of Lesion in: facial nucleus and nerve (CN VII) | loss of ipsilateral expression and diminished salivatory function |
| Effects of Lesion in: main sensory nucleus (CN V) | loss of somatosensory sensation from head on ipsilateral side of lesion |
| Effects of Lesion in: Motor nucleus (CN V) | loss of jaw-closing reflex |
| Effects of Lesion in: mesencephalic nucleus (CN V) | loss or disruption of jaw-closing reflex |
| Effects of Lesion in: nucleus locus ceruleus and raphe nuclei | disruption of sleep and wakefullness, loss of control over emotional behavior |
| Effects of Lesion in: solitary nucleus | disruption of cardiovascular regulation and taste sensation |
| What are the four main vestibular nuclei of the pons? | medial, lateral, inferior, superior |
| The caudal pons is divided into what three sections? | Tegmentum, Inferior Cerebellar Peduncle, Basilar Pons |
| The middle pons is divided into what three sections? | Tegmentum, Middle Cerebellar Peduncle, Basilar Pons |
| The rostral pons is divided into what three sections? | Tegmentum, Superior Cerebellar Peduncle, Basilar Pons |
| What features are part of the auditory pathway? | Superior olivary nucleus, lateral lemniscus, trapazoid body |
| The tegmentum is the _____ part of the pons. | dorsal |
| The basilar pons is the _____ part of the pons. | ventral |
| The ventral spinocerebellar tract crosses the midline how many times? | twice, also known as "double cross" |
| What is the function of the lobes of the cerebellum? | regulation of balance, coordinated movements, and muscle tone |
| The anterior cerebellar lobe receives input from where? | mainly spinal cord, little brainstem |
| The posterior cerebellar love receives input from where? | mainly cerebral cortex, little brainstem |
| The flocculonodular cerebellar lobe receives input from where? | vestibular structures |
| What is the function of the middle cerebellar peduncle? | transmits inputs arising from the contralateral deep pontine nuclei to cerebellar cortex |
| What is the function of the superior cerebellar peduncle? | major efferent pathway of cerebellar cortex, targets red nucleus and thalamus |
| What is the function of the dentate, interposed, and fastigial nuclei? | coordination of movements and regulation of muscle tone and balance |
| Effects of Lesions in: Cerebellar lobes | loss of balance, hypotonia, or loss of coordination of movements |
| Effects of Lesion in: middle cerebellar peduncle | unknown, possibly affect purposeful movements |
| Effects of Lesion in: superior cerebellar peduncle | disrupt coordinated movements functions of cerebellum |
| Effects of lesion in: dentate, interposed, and fastigial nuclei | loss of function associated with cerebellum (coordination, nystagmus, ataxia, hypotonia) |
Created by:
LadySarabii
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