Neurology Flashcards
What tracts are affected in subacute degeneration of the spinal cord?
Dorsal Column and Lateral corticospinal tract
Function of spinothalamic tract?
Transmits pain, temperature, and crude touch sensations
Function of dorsal column?
Responsible for fine touch, proprioception, vibration, and pressure sensations
Where does decussation occur in the spinothalamic tract?
Level of spinal cord entry within the anterior commissure
Spinothalamic tract:
-A lesion will lead to loss of what and where?
Pain and temperature on the CONTRALATERAL side below the lesion
Where does decussation occur in the dorsal column?
At the level of the medulla in the medial lemniscus
A lesion in the dorsal column will result in what?
loss of fine touch, vibration, and proprioception on the ipsilateral side below the level of the lesion.
Function of lateral corticospinal tract?
Controls voluntary motor function, particularly fine movements of the distal limbs
Decussation lateral corticospinal tract?
pyramidal decussation at the medulla, the fibers cross to the contralateral side and form the lateral corticospinal tract.
Lesions affecting the lateral corticospinal tract will result in?
contralateral motor weakness, particularly affecting fine motor skills and dexterity. Upper motor neuron signs (e.g., hyperreflexia, spasticity) are seen
Functions of anterior corticospinal tract?
Controls voluntary motor function, particularly for trunk and proximal limb muscles
where does decussation occur in anterior corticospinal tract?
In the spinal cord, fibers from the anterior corticospinal tract cross at the level of the spinal cord to synapse with lower motor neurons in the anterior horn.
Lesions of the anterior corticospinal tract typically result
weakness and impaired movement of the trunk and proximal muscles on the contralateral side.
Site of lesion in Wernicke and Korsakoff syndrome
Medial thalamus and mammillary bodies of the hypothalamus
site of lesion in Hemiballism
Subthalamic nucleus of the basal ganglia
