Motor cortex

Question 1

primary motor cortex

Answer 1

precentral gyrus
Broadman 4
Giany pyramidal cells of betz are found here in layer 5
input; VA , VL
output; corticospinal & corticobulbar tract
corticomotor neurons are only found here which terminate directly on Alpha motor neuron
unilateral innervation of distal muscles

Question 2

supplementary motor cortex

Answer 2

superior frontal gyrus ; posteromedial part
output; Br4
Input; basal ganglia , prefrontal cortex , premotor cortex
Functions; Movement initiation, continuity , 4 limbs movemnent, bimanual movemnt

Question 3

premotor cortex

Answer 3

middle frontal gyrus ; Inferior posterolateral part
output; Br4
Input ; cerebellum, supplemetary area , parietal area
Functioning; truck muscles & planning

Question 4

Unimodal parietal associative area

Answer 4

Broadmann 5 , 7
Superior parietal lobe
input ;dorsal column of proprioception , cerebellum
output; Br4
functioning; Navigation, visual spatial orientation