Ion Channel Proteins
Primary Motor Cortex
- The primary motor cortex (M1, or somatomotor area) occupies a large portion of the precentral gyrus (Brodmann area 4) and typically executes movements that are selected and planned by other areas of the brain.
- Each hemisphere has a primary motor cortex and both are organized by body region or somatotopically.
- The medial and superior portions control the actions of the feet, legs, trunk, and hands.
- The lateral portions control the actions of the head, mouth, and throat.
- The primary motor cortex on one side of the brain controls the muscles on the opposite side of the body.
- Nerve cell impulses (or action potentials) exit the motor cortex via upper level neurons, which cross over at the medulla pyramids.
Want to learn fast and effectively? Master neuroanatomy with these quizzes, videos and worksheets on the parts of the brain.
- The axons then enter the spinal cord as a part of the corticospinal tracts. Lower level neurons carry impulses from the ventral horns of the spinal cord to the skeletal muscles.
Swipe to show/hide the answers