Name and describe the three motor tracts that comprise the lateral group of descending fibers and explain their relative functions in motor control
What will be an ideal response?
Answer: Motor neurons arising from the primary motor cortex project to the spinal cord motor neurons that control voluntary movement. The lateral group of fibers includes the corticospinal tract, which starts (mostly) in the primary motor cortex and decussates in the caudal medulla en route to the spinal cord. These fibers control the distal parts of the limbs (hands, fingers, and toes). The corticobulbar tract projects from the medulla to the motor nuclei of the 5, 7, 9-12 cranial nerves and is involved in control of the muscles of the neck, face, tongue, and a portion of the extraocular muscles. The rubrospinal tract projects from the midbrain red nucleus to the spinal cord; this tract controls movements of the forearms and hands that are independent of trunk movements.
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