The Motor System

Study Notes

Brain Functions in Voluntary Movement

The primary motor cortex, located in the frontal lobe of the brain, is responsible for initiating and coordinating voluntary movements.
Voluntary movements involve the activity of several different brain areas, primarily the motor cortex.

Corticospinal Tract

The corticospinal tract is a major pathway that conducts impulses from the brain to the spinal cord, facilitating voluntary motor control.
It plays a crucial role in controlling fine motor skills, especially in the limbs and hands.

Interaction with Motor Areas

The basal ganglia, a group of nuclei located deep within the cerebral hemispheres, interacts with the primary motor area, aiding in the planning and execution of movements.
This interaction ensures smooth and coordinated movements, preventing unwanted muscle contractions.

Descending/Indirect Tracts

Other descending or indirect tracts in the brain are responsible for regulating involuntary motor functions, such as posture and muscle tone.
These tracts help in integrating sensory information and adapting movements accordingly.

Role of Basal Nuclei

Basal nuclei play a critical role in initiating and regulating voluntary movements while inhibiting excessive movement.
They are involved in the modulation of motor commands, ensuring that movements are purposeful and not jerky or disorganized.

Description

Test your knowledge on the motor system with this quiz prepared by John Patrick R. Lentejas. Explore the fascinating neural pathways in the brain as discussed in Zeynep Saygin's book, 'Rainbow Connections.' Begin by saying a prayer and setting your intentions for the class.