Motor Function of CNS

CNS: Motor Functions 

68 cards   |   Total Attempts: 182
  

Cards In This Set

Front Back
What device can measure motor function in the brain?
MRI (Magnetic Resonance Imaging)
How are functional areas of the human cerebral cortex determines?
By electrical stimulation of the cortex during neurosurgical operations & by neurological examination of patients with destroyed cortical regions.
SKIP
SKIP
What are the 3 types of Neurons?
1. Granular (Stellate, Interneurons) 2. Fusiform (Efferent)3. Pyramidal (Efferent)
Cerebral Control of Motor Function
Layer IV: Incoming Signal comes here
Layer V (BStem & SPC) & IV (Thalamus): Output Signal leaves from here
Layer I, II, & III perform most of the intracortical assoc. functions.
Broca's Area
Word Formation. Controls speech.
When Damaged: Impossible to speak whole words
Neuronal Tract
Axons of different neurons coming together and forming a tract
Where do the fibers from the pyramidal cells have to cross-over to reach the spinal tract?
Medualla Oblongata
Internal Capsule
In the pons, medulla, & thalamus
Has a lot of blood supply; tumors can grow here
Can affect the transduction of neuronal message
What 3 structures receive strong motor signals from the corticospinal system every time a signal is transmitted down the SC to cause a motor activity?
1. Basal Ganglia2. Brain Stem3. Cerebrum
Motor Cortex
Initiates most voluntary movements
Controlled by nerve signals from the somatosensory system
Operates in assoc. w/ the basal ganglia & cerebellum to excite to an appropriate course of motor action.
What are the 3 divisions of the motor cortex?
1. Primary Motor Cortex 2. Premotor Area3. Supplementary Motor Area
Pyramidal System (Aka- Corticospinal Tract)
Leaves the cortex, the fibers pass through the internal capsule.
Then, down towards the brain stem forming the pyramids of the medulla.
Fibers cross over in the medulla and then reach the spinal cord.
Functions of the Motor Cortex
1. Sends sequential (One at a time) & Parallel (All together) commands.
2. Changes intensities or modifies the timings.
3. Bypasses cord patterns, replaces them with higher-level patterns from the brain stem or cortex.
4. Cortical Pattern: complex, "learned" Cord Pattern: heredity, "hard wired"
Wenicke's Area
Important for Language Comprehension