descending tracts of spinal cord (bio exam 4)

Origin: cerebral cortex
-fibers cross in base of medulla
Termination: anterior gray horn
Function: precise, discrete voluntary movements

Origin:cerebral cortex
Termination:anterior gray horn
-fibers cross in spinal cord
Function:movements of axial skeleton

Origin:midebrain -fibers cross
Termination:anterior gray horn
Function:precise, discrete voluntary movements

Origin:Midbrain-fibers cross
Termination:anterior gray horn
Function:movements of head in response to auditory, visual, and cutaneous stimuli

Origin:medulla- no crossing
Termination:anterior gray horn
Function:body tone in response to head movements for maintaining equilibrium

Origin: medulla-no crossing
Termination:anterior gray horn
Function:inhibit extensor reflexes and muscle tone in axial skeleton and prozimal limb muscles

Origin:Pons- no crossing
Termination:anterior gray horn
Function:facilitate extensor reflexes and muscle tone in axial skeleton and proximal limb muscles