Lecture 11: Motor Systems Flashcards
Distinguish between direct and indirect corticobulbar fiber
Direct: fibers that project to cranial motor neurons
Indirect: fibers that project to midbrain and pontine reticular formations adjacent to CN nuclei
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/922/818/a_image_thumb.png?1523410950)
Where are axons terminating in upper spinal cord levels vs. lower spinal cord levels located in the posterior limb of the internal capsule?
- Axons terminating in upper spinal cord levels are rostral
- Axons terminating in lower levels are caudal
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/923/400/a_image_thumb.png?1523412756)
The Supplementary Motor Cortex is in which Brodmann’s area and is involved in what function?
- Medial portion of Area 6
- Involved in organizing or planning the sequence of muscle activation required to make a movement
- M1 will be the one executing the movement
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/925/360/a_image_thumb.png?1523412977)
The Premotor Cortex is located in what Broadmann’s area and is closely associated with what other cortex?
- Area 6
- Closely associated with Supplementary Cortex
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/925/591/a_image_thumb.png?1523413099)
Premotor cortex receives inputs from where and projects to which areas?
- Receives inputs from sensory areas of the parietal lobe
- Projects to M1, the SC, and RAS
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/925/620/a_image_thumb.png?1523413165)
The Premotor cortex is involved with what function of movement?
- The PREPARATION to move
- Organizes those postural adjustments required to produce movement
- Directs control of proximal limb muscles use to position the arm for movement tasks or to orietn the body for movement
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/925/681/a_image_thumb.png?1523413242)
What artery may contribute to the catastrophic lesions of the posterior limb of the internal capsule and what deficits will occur?
- Lenticulostriate branches of the M1 segment of the MCA
- Motor symptoms in the contralateral UE and LE’s = weakness and transient flaccid paralysis
- Followed by spastic paralysis (UMN signs) that typically never resolve
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/925/775/a_image_thumb.png?1523413612)
What makes up the striatum?
Caudate + Putamen + Nucleus Accumbens + Olfactory Tubercle
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/927/780/a_image_thumb.png?1523415350)
What 3 things make up the Corpus Striatum?
Globus pallidus + Caudate + Putamen
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/927/988/a_image_thumb.png?1523415407)
What 2 things make up the Lentricular nucleus?
Globus pallidus + Putamen
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/928/001/a_image_thumb.png?1523415466)
What 2 things make up the neostriatum?
Caudate + Putamen
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/964/840/a_image_thumb.png?1523455756)
What is the Subthalamic Fasciculus (Basal Nuclei Tract); what type of fibers?
- Reciprocal fiber tracts between globus pallidus and subthalamus
- Contain excitatory fibers
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/964/878/a_image_thumb.png?1523455905)
What are the Nigro-Thalamic Fibers (Basal Nuclei Tract); where do they terminate and is it the same area as the fibers from globus pallidus?
- Non-dopaminergic fibers that originate in pars reticularis of substantia nigra
- Terminate in VA and VL thalamic nuclei
*Fibers from the globus pallidus and the substantia nigra DO NOT terminate in the same areas of the VL and VA thalamic nuclei
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/965/022/a_image_thumb.png?1523456100)
What are the Nigro-striatal fibers (Basal Nuclei tracts); where do they terminate and what disease are they related to?
- Dopaminergic fibers that originate in pars compacta of substantia nigra
- Terminate in the caudate and putamen
- Neurons in this area of the substantia nigra are destroyed in Parkinson’s disease
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/965/266/a_image_thumb.png?1523456234)
Neurons in which area are destroyed in Parkinson’s disease?
Dopaminergic fibers that originate in pars compacta of the Substantia Nigra
![](https://s3.amazonaws.com/brainscape-prod/system/cm/241/965/658/a_image_thumb.png?1523456562)