Examination of Coordination LECTURE 2 Flashcards
the ability of the central nervous system to control or direct the nervous system in purposeful movement and postural adjustment by selective allocation of muscle tension across appropriate joint segments.
Motor control
- Ability to execute smooth, accurate, controlled motor response
- Need input from various sensory modalities
Dependent on fully intact neuromuscular system
Coordination
Coordinated movements include:
- Appropriate speed
- Speed
- Distance
- Direction
- Timing
- Muscular tension
- Appropriate synergistic movements
- Easy reversing between muscle groups
- Proximal fixation
use of fingers for fine motor tasks
Dexterity
rapidly and smoothly initiate, stop or modify movement while maintaining postural control
Agility
Coordination Impairment
Results in movements which are:
- Awkward
- Extraneous
- Uneven
- Inaccurate
Motor system review
WHAT system is muscles, joints, sensory and motor innervation
Peripheral
Motor system- What area?
neocortex and basal ganglia (strategy),
middle level: motor cortex and cerebellum (tactics),
lowest level: brain stem and spinal cord (execution)
Central
Principal area involved in motor function
Motor Cortex
What is involved when talking about the motor cortex?
- includes Brodmanns’s areas 4 and 6 in frontal lobe (precentral gyrus)
- Planning coordintated movement requires information from many areas of the neocortex
- Brodmanns area 4: is the primary motor cortex, simple tasks
- Contains largest concentration of corticospinal neurons
- Controls contralateral voluntary movements
What is involved in Brodmann’s area 6?
- Has supplementary motor and premotor areas
- Innervate motor units that are involved in initiating movement, simultaneous bilat. grasp, sequential tasks, orientation of eyes and head
- Helps control trunk and proximal limb movement
- Helps anticipate postural changes
- Intricate movements
what is involved when talking about the Motor Homunculus?
- Somatotopic organization of motor cortex
- Illustrates the amount of cortical area devoted to motor control of a body part/region
- Larger areas associated with areas of body that have to have finer gradiation of control
What 3 primary sources does the Motor Cortex receives info?
- Somatosensory cortex: relayed to primary cortex from the thalamus
- Cerebellum through the thalamus
- Basal ganglia: through the thalamus
- AKA: pyramidal tract
- Signal from motor cortex directly to spinal cord
- Originates areas 4 and 6, passes through internal capsule and brainstem
- Most cross to opposite side in medulla, descend through lateral spinal thalamic tract
- Other fibers form ventral corticospinal tract: cross in cervical or upper thoracic region
Corticospinal tract
descending pathways
directly to CN nuclei: trigeminal, facial, hypoglossal, some to the reticular formation before going to CN nuclei
Corticobulbar tract
descending pathways
goes to motor neurons in cervical cord: neck, CN XI, help guide head movements assoc with visual motor tasks
Tectospinal tract
descending pathways
Project to ant horn of spinal cord: influences muscle tone, reflex activity (influences muscle spindle activity)
Reticulospinal tracts
descending pathways affect which motor neurons?
extension and flexion
descending pathways
Goes to all levels of spinal cord
Postural control/head movements (stimulates extensors)
Vestibulospinal tract
- Regulates movement, postural control and muscle tone
- Helps to compare information and correct “errors”
- Analyzes information from cortex with peripheral feedback
- Gets input on balance, posture, position, rate, rhythm and force of slow movements of peripheral body segments
- If movement deviates supplies a corrective influence
Cerebellum
- CNS analysis of movement information, analyzes how accurate the performance is and provides for error correction
- Uses movement information, determination of accuracy, provides for error correction
Closed Loop System
- Control system with an open loop system with preprogrammed instructions to an effector that does not use feedback information and error-detecting processes
Stereotypical movements and rapid, short duration movements: they don’t allow sufficient time for feedback loop
Open Loop System
Basal Ganglia- what are the 3 nuclei in base of cerebral cortex?
- Caudate nucleus,
- putamen
- globus pallidus
This helps with Help with:
- initiation and regulation of gross intentional movements
- Planning and executing complex motor responses
- Facilitation of desired motor response while inhibiting the undesirable response
- Accomplish automatic movements and postural adjustments
- Normal background muscle tone
- Has somatotopic organization
- Influence of this is indirect and mediated by descending projections from cortical motor areas: there is a feedback loop: there is information flowing from areas assoc with movement to the BG and then information flowing back to the other areas
Basal Ganglia
- This is pathway is Responsible for afferent transmission of discriminative sensations
- Fine gradiation of intensity and precise localization on the body surface are mediated here
Dorsal Column-Medial Lemniscal pathway
Where do the Dorsal Column-Medial Lemniscal pathway senses transmit ?
- Discriminative touch
- stereognosis
- Tactile pressure
- barognosis
- graphesthesia
- recognize texture
- Kinesthesia
- two point discrimination
- Proprioception
- vibration
What are some Coordination Impairments of the cerebellar pathology?
- Difficult to execute accurate, smooth controlled movements
- Affect muscle tone, equilibrium, posture, initiation and force of movement
- Ataxia
what are some Motor Impairments with Cerebeller Pathology?
- Asthenia
- Dysarthria
- Dysdiadochokinesia
- Dysmetria
- hypermetria
- hypometria
- Dyssynergia
- Asynnergia
- Gait ataxia
- Hypotonia
- Nystagmus
- What is the definition of Ataxia
* What may ataxia effect in the body?
- loss of muscle coordination
- may affect gait, posture, patterns of movement
- Difficult to initiate movement and errors in rate, rhythm and timing
generalized mm weakness
Asthenia