Anatomy and function of the pyramidal motor systems: cortical organisation Flashcards
Where is our primary somatosensory area
Postcentral gyrus (area 1-3)
note: it is behind the central gyrus
where is our primary motor area
Precentral gyrus (area 4)
Where is our somatosensory association areas
Supramarginal gyrus (area 5,7)
Where is the premotor area
Middle frontal gyrus
What are found in the superior temporal gyrus
Wernicke’s area (first language area)
Primary auditory area
Where is Broca’s area and what does it do
Inferior frontal gyrus (second language area)
Which area of the brain receives sensation
Primary somatosensory cortex (area 1-3)
Which area produces movement
motor cortex
which area organises movement
Premotor cortex
Which area of the brain plans movement
Prefrontal cortex
Which area of the brain receives from primary somatosensory cortex
Secondary somatosensory cortices
How is movement processed in rain
Primary somatosensory cortex receives sensation
Signals move anteriorly to motor Cortex which produces movement
The premotor cortex also tells the motor cortex what to do because it organises movement
Secondary somatosensory cortices process a lot of sensory information and send it anteriorly in the brain so other cortices of the brain take into account what’s happening before they instruct the motor cortex
Prefrontal cortex plans the movement and feeds back to motor cortex which produces movement
What is the sensory cortex and the motor cortex separated by
Central sulcus
How are the layers of the sensory cortex and the motor cortex different
Layers 4 and 5 are different
Layer 4 in sensory cortex is larger and contains a lot of granular cells which is receiving a lot of information. Layer 4 in motor cortex is small
Layer 5 is small in the sensory cortex and large in the motor Cortex and has a lot of pyramidal cells which project to other areas of brain and take movement information elsewhere
What are the regions in the brain that play a role in movement
Prefrontal cortex Premotor Primary motor Primary somatosensory Secondary somatosensories
