Medial Motor Systems (Descending) Flashcards
Where is the site of origin for the Anterior Corticospinal Tract?
In the primary motor cortex and supplementary motor area
Where is the site of decussation for the Anterior Corticospinal Tract?
There is no decussation
Where does the Anterior Corticospinal Tract end?
The cervical and upper thoracic spinal cord (in the medial intermediate zone and medial motor nuclei of the anterior horn)
What is the function of the Anterior Corticospinal Tract?
Controls bilateral axial and girdle muscles
What tracts make up the medial motor pathways?
Anterior Corticospinal Tract
Vestibulospinal Tracts (VSTs)
Reticulospinal Tracts
Tectospinal Tracts
Where is the site of origin for the Vestibulospinal Tracts (VSTs)?
Medial VST: Medial and inferior vestibular nuclei (Rostral Medulla)
Lateral VST: Lateral Vestibular Nucleus (Pons)
Where is the site of origin for the Reticulospinal Tract?
The pontine and medullary reticular formation
Where is the site of decussation for the Vestibulospinal Tracts?
None
Where is the site of decussation for the Reticulospinal Tract?
None
Where does the Vestibulospinal Tract end?
Medial VST: Cervical and Upper Thoracic spinal cord
Lateral VST: Entire spinal cord
(Both end in the medial intermediate zone and medial motor nuclei of the anterior horn)
Where does the Reticulospinal Tract end?
The entrire spinal cord (in the medial intermediate zone and medial motor nuclei of the anterior horn)
What are the functions of the Vestibulospinal Tracts?
Medial VST: Positioning of the head and neck
Lateral VST: Balance
What is the function of the Reticulospinal Tract?
Automatic posture and gait-related movements
Where is the site of origin for the Tectospinal Tract?
In the superior colliculus of the midbrain
Where is the site of decussation for the Tectospinal Tract?
Dorsal/Posterior tegmental decussation in the midbrain
