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60 Cards in this Set

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Descending motor pathways can be divided into what systems and based on what?
1. Lateral Motor System
2. Medial Motor System
Based on spinal cord location
Where does the lateral motor system travel?
Lateral Columns of spinal cord white matter
Where does the axons terminate?
1. Lateral Groups of Ventral Horn Motor Neurons
2. Lateral Groups of Interneurons
What does the lateral motor system control?
Control movements of extremities (DISTAL MUSCLES) arms, legs, feet, hands
What are the 2 traks in the lateral motor system?
1. Lateral Corticospinal Tract
2. Rubrospinal Tract
What is significant about the Lateral Corticospinal Tract?
Clinicall the most important motor pathway
What is the nucleus of the Rubrospinal tract?
Red Nucleus; Midbrain (Magnocellular part)
What is significant about the Rubrospinal tract?
It increases Flexor tone in the upper extremities
What does both lateral motor tracts provide in movements?
It provides for rapid, dexterous movements at individual joints/digits
Where does the medial motor system travel?
Anteromedial columns of the spinal cord white matter
Where does the medial motor pathways synapse?
1. Medial Ventral Horn Motor Neurons
2. Interneurons
The medial motor system control movements of?
Trunk (Axial & Girdle Muscle)
The medial motor system is involved what type of movements?
1. Postural Tone
2. Balance
3. Orienting movements of the head, neck
4. Automatic gait-related movements
What is the pathway of the medial motor system?
1. Descend ipsilaterally
2. Terminate ono interneurons
3. Some of whose axons cross in the ventral comissure
How does the medial motor system influence the axial musculature?
Bilaterally
What are the 4 tracts in the medial motor system?
1. Anterior (Ventral) corticospinal Tract
2. Vestibulospinal Tract
A. Lateral VST
B. Medial VST
3. Reticulospinal Tracts
A. Medial Reticulospinal Tract
B. Lateral Reticulospinal Tract
4. Tectospinal Tract
Which tract does not cross the midline?
Anterior (ventral) corticospinal tract
What is the anterior corticospinal tract involved in?
Bilateral control of axial & girdle muscles
Which 2 medial motor system tracts have 2 subtracts?
1. Vestibulospinal tracts
2. Reticulospinal tracts
From where (nuclei) does the Vestibulospinal tract come from?
Vestibular Nuclei
What is the pathway and function of the lateral VST?
1. Run the length of the spinal cord
2. Controls Extensor Tone
What is the pathways and function of the medial VST?
1. Ends at the cervical cord level
2. Controls head & neck muscles
What is the function of the Reticulospinal Tracts?
Autonomic Posture & Gait Movement control
Where does the Medial and Lateral Reticulospinal tract originate?
1. Medial RST: Pontine reticular formation
2. Lateral RST: Medullary Reticular Formation
What does the Tectospinal Tract control?
Provides coordination of head & eye movments
Where does the Tectospinal tract end?
Cervical cord
What is Paresis?
Weakness (partial paralysis)
i.e. hemiparesis - weakness on 1 side of body
What is -Plegia?
No movement
i.e. hemiplegia - no movement on 1 side of the body
What is Paralysis?
No movement
i.e. leg paralysis - no leg movement
What is Palsy?
Imprecise term
ie. facial palsy - weakness/no movement of the face muscles
What are the 4 tracts in the medial motor system?
1. Anterior (Ventral) corticospinal Tract
2. Vestibulospinal Tract
A. Lateral VST
B. Medial VST
3. Reticulospinal Tracts
A. Medial Reticulospinal Tract
B. Lateral Reticulospinal Tract
4. Tectospinal Tract
Which tract does not cross the midline?
Anterior (ventral) corticospinal tract
What is the anterior corticospinal tract involved in?
Bilateral control of axial & girdle muscles
Which 2 medial motor system tracts have 2 subtracts?
1. Vestibulospinal tracts
2. Reticulospinal tracts
From where (nuclei) does the Vestibulospinal tract come from?
Vestibular Nuclei
What is the pathway and function of the lateral VST?
1. Run the length of the spinal cord
2. Controls Extensor Tone
What is the pathways and function of the medial VST?
1. Ends at the cervical cord level
2. Controls head & neck muscles
What is the function of the Reticulospinal Tracts?
Autonomic Posture & Gait Movement control
Where does the Medial and Lateral Reticulospinal tract originate?
1. Medial RST: Pontine reticular formation
2. Lateral RST: Medullary Reticular Formation
What does the Tectospinal Tract control?
Provides coordination of head & eye movments
Where does the Tectospinal tract end?
Cervical cord
What is Paresis?
Weakness (partial paralysis)
i.e. hemiparesis - weakness on 1 side of body
What is -Plegia?
No movement
i.e. hemiplegia - no movement on 1 side of the body
What is Paralysis?
No movement
i.e. leg paralysis - no leg movement
What is Palsy?
Imprecise term
ie. facial palsy - weakness/no movement of the face muscles
What are the 4 tracts in the medial motor system?
1. Anterior (Ventral) corticospinal Tract
2. Vestibulospinal Tract
A. Lateral VST
B. Medial VST
3. Reticulospinal Tracts
A. Medial Reticulospinal Tract
B. Lateral Reticulospinal Tract
4. Tectospinal Tract
Which tract does not cross the midline?
Anterior (ventral) corticospinal tract
What is the anterior corticospinal tract involved in?
Bilateral control of axial & girdle muscles
Which 2 medial motor system tracts have 2 subtracts?
1. Vestibulospinal tracts
2. Reticulospinal tracts
From where (nuclei) does the Vestibulospinal tract come from?
Vestibular Nuclei
What is the pathway and function of the lateral VST?
1. Run the length of the spinal cord
2. Controls Extensor Tone
What is the pathways and function of the medial VST?
1. Ends at the cervical cord level
2. Controls head & neck muscles
What is the function of the Reticulospinal Tracts?
Autonomic Posture & Gait Movement control
Where does the Medial and Lateral Reticulospinal tract originate?
1. Medial RST: Pontine reticular formation
2. Lateral RST: Medullary Reticular Formation
What does the Tectospinal Tract control?
Provides coordination of head & eye movments
Where does the Tectospinal tract end?
Cervical cord
What is Paresis?
Weakness (partial paralysis)
i.e. hemiparesis - weakness on 1 side of body
What is -Plegia?
No movement
i.e. hemiplegia - no movement on 1 side of the body
What is Paralysis?
No movement
i.e. leg paralysis - no leg movement
What is Palsy?
Imprecise term
ie. facial palsy - weakness/no movement of the face muscles