Chapter 4 - Disorders of Movement and Posture Flashcards
1
Q
What comprises the striatum (neostriarum)?
A
Putamen and Caudate
2
Q
What is the hypothesized role of the subthalamic nucleus with regard to the globus pallidus and ventral thalamus?
A
The subthalamic nucleus exerts an inhibitor or regulating influence on the globus pallidus and ventral thalamus
3
Q
A lesion in the subthalamic nucleus will result in?
A
Chorea on the contralateral limb.
4
Q
What is the hyperdirect pathway?
A
Activates the subthalamic nucleus directly from the motor cortex
Without the necessity of the intervening striatum
5
Q
What do you call the bundle of fibers from the GPi that reach the thalamus?
A
Ansa lenticularis
Fasciculus lenticularis
- Ansa lenticularis - sweeps around the internal capsule
- Fasciculus - traverses the internal capsule in a number of small fascicles and then continues medially and caudally to join the ansa in the prerubral field.
6
Q
Where would the ansa lenticularis and fasciculus lenticularis meet?
A
Prerubral field
