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Sensory Tracts Ascending pathways that transmit sensory information from the periphery to the CNS
2 major tracts involved in the Conscious Perception of External stimuli Spinothalamic Tract (within the anterolateral system)and the Dorsal Column (Medial-Lemniscal system)
1 Major tract involved with the unconscious perception of external stimuli Spinocerebellar tract
3 Tracts within the Anterolateral System Spinothalamic, Spinoreticular, Spinomesencephalic
Spinothalamic Tract Transmits pain, temperature, light tough, pressure, tickle & itch
Spinoreticular Tract Transmits pain
Spinomesencephalic Tract Transmits pain and touch
Dorsal Column System Transmits 2-point discrimination, proprioception, pressure, and vibration
Fassciculus Gracilis Sensory information from inferior portion of body
Fasciculus Cuneatus Sensory from superior portion of body
Postcentral Gyrus Sensory area (primary sensory cortex), found in the anterior parietal lobe along the coronal plane; concerned with recognition of sensations of your skin, muscle and joints
Upper Motor Neurons Lie solely within the brain and spinal cord whose cell bodies originate in the cortex and connect to lower motor neurons either directly or through interneurons
Lower Motor Neurons Cell bodies lie in the CNS with axons going outside the periphery (think "nerves" that innervate skeletal muscle)
3 Basic Steps of Voluntary Movement Stimulation of the Upper Motor Neurons in the premotor areas of the cortex, Axons form descending tracts, LMNs are then stimulated which stimulate skeletal muscles to contract
Motor Tracts Descending pathways that carry the action potentials from the cerebellum to the brainstem or spinal cord
Pyramidal System Motor Pathway, provides conscious, voluntary control or skilled movement or skeletal musculature. Maintains muscle tone, controls speed and precision of movement
lateral Pyramidal Sub-Tract a Corticospinal Tract: Movement of the neck, trunk, upper and lower limbs
anterior Pyramidal Sub-Tract a Corticospinal Tract: Movements of the neck and trunk
Coricospinal Tract Pyramidal Tract Involved in movements below the head
Corticobulbar Tract Involved with movements of the head and face
ExtraPyramidal System Indirect pathway, Provides unconscious control (reflex-like, but not ANS-can be overridden) bu modulating or altering sensitivity of lower motor neurons to descending pyramidal control output
Rubrospinal Tract extrapyramidal tract, coordination of movements
Vestibulopinal Tract extrapyramidal tract, Maintenance of upright posture and balance
Reticulospinal Tract extrapyramidal tract, Adjustments to posture and walking
Tectospinal Tract extrapyramidal tract, Movements of the head and neck in response to visual and auditory reflexes
Basal Ganglia Important in planning, organizing and coordinating motor movements and posture. Stimulates the initiation of movement, Inhibit muscles that would be antagonists to those producing the desired movements
Cerebellum Consists of Flocculonodular Lobe, Spinocerebellum, and Cerebrocerebellum
Flocculonodular lobe Coordinates eye movements, helps control balance, also gets input from he vestibular structures the ear
Spinocerebellum made up of the vermis and medial portion of the lateral hemispheres, main function is to compare the intended motion with the actual movement and make the appropriate corrections to facilitate smooth, coordinated movements
Cerebrocerebellum made up of the 2/3rds of the lateral hemispheres, main functions is to communicate with the motor, pre-motor andpre-rontal cortex to plan and practice rapid complex motor actions
Brainstem Functions Houses the major ascending and descending tracts, Important in controlling and regulating some somatic motor output and reflexes, Many vital functions (heart rate, blood pressure, respiration)
Reticular Activating System (RAS) Involved with regulating cyclical motor functions. Other branches of sensory tracts proect inot the reticular formation to stimulate wakefulness and consciousness
Superior Temporal area auditory processes and olfaction
Parietal Lobe gestation (the conception or development or an idea or plan)
Lower frontal Lobe Broca's Motor Speech area, damage affects ability to produce language efficiently
Posterior Temporal Lobe Wernicke's area, conceptualization and formulation of spoken though
Posterior -Parietal Lobe Complex judgements and synthesis of information
Prefrontal Cortex Goal Setting, planning, behavioral perspective
Anterior part of the frontal lobe cognition and mental activity
Created by: 735568154



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