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28 Cards in this Set
- Front
- Back
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motor neuron pool
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bundle of motor neurons targeting any one muscle
-located in ventral horn |
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cerebral motor cortex
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controls voluntary movements
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motor innervation
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cerebral cortex->corona radiata-> base of pons-> cerebral peduncle-> medullary pyramid
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cortical spinal tract
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in medullary pyramids
-crosses neuro-axis to reach interneurons and motor neurons for contralateral body |
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primary motor cortex
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Area 4,6, somatosensory cortex
-layer 5 contains Betz cells -precentral gyrus |
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midbrain motor regions
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CNIII (midbrain)
CNV (pons) CNVI (pons) CNVIII(facial expression) CNIX (swallow, cough) CNX (swallow, cough) CNXI (shoulder/head) CNXII (tongue) |
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CNVII innervation pattern
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upper face bilateral
lower face contralateral |
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dorsal column system
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conscious, discriminitive touch, body positioning
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anterolateral system
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pain, temperature, deep touch
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spinocerebellar system
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proprioceptive/kinesthetic info, unconscious motor coordination
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general somatosensory pathway
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stimulus->primary afferent (soma in dorsal ganglia)->secondary afferent (inside CNS)-> tertiary afferent (thalamus)-> cortex
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Discriminative (body)
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1. gracile/cuneate fascicles
2. gracile/cuneate nucleus synapse 3. internal arcuate fibers (secondary afferent) cross, then form medial lemniscus in pons 4. ML-->ventral posterior lateral nucleus in thalamus (VPL) 5. Tertiary fibers go through internal capsule to S1, S2 |
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gracile nucleus
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lower body sensation
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cuneate nucleus
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upper body sensation
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Pain/temp (body)
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1. synapse in dorsal horn
2. secondary afferents cross @ anterior commissure 3. synapse in thalamus VPL 4. tertiatry afferents to somatosensory cortex |
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anterior commissure
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contains crossing fibers of the pain/temp secondary afferents
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Proprioception (body)
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1. lumbar, low thoracic: synapse in Clarke's nucleus (ipsilateral gray)
2. cervical/upper thoracic: travel in cuneate fasciculus, synapse in ipsilateral lateral cuneate nucleus 3. secondary afferents travel in spinocerebellar tract to ipsilateral cerebellum |
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Discriminative (face)
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1. CNV enters pons, synapse in CNV sensory nucleus
2. secondary afferents cross, then synapse in contralateral ventral posterior medial thalamus (VPM) 3. tertiary VPM ascend to sensory cortex |
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Pain/temp (face)
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1. enter pons and descend via spinal tract of CNV to synapse in spinal nucleus of CNV
2. secondary afferents cross and go to VPM |
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Proprioception (face)
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1. enter pons through CNV motor
2. cell bodies lie inside CNS in CNV mesencephalic nucleus (not CNV ganglion) 3. secondary afferents to ipsilateral trigeminal motor nucleus, then cerebellum |
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VPL
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ventral posterior lateral nucleus of thalamus
-receives body sensory fibers from medial lemniscus, dorsal horn -synapse, then goes to cortex |
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VPM
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ventral posterior medial nucleus of thalamus
-receives face sensory fibers from CNV sensory nucleus, CNV spinal nucleus |
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medial lemniscus
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axons formed by the secondary afferents of body discriminatory touch (internal arcuate fibers)
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internal arcuate fibers
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crossing fibers of the body discriminatory secondary afferents
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Clarke's nucleus
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proprioceptive lower body synapse between dorsal root ganglia afferents and secondary afferents
-secondary afferents go to dorsal spinocerebellar tract toward cerebellum |
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cuneate fasciculus
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contains sensory axons for proprioception and discriminatory touch
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lateral cuneate nucleus
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equivalent to Clarke's nucleus for lower body
-secondary afferents go to ipsilateral cerebellum |
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mesencephalic nucleus
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CNV cell bodies for proprioception in pons
-processes travel to ipsilateral trigeminal motor nucleus--> cerebellum |
