Final answer:
The primary 6 descending (efferent) tracts of the spinal cord are: corticospinal, vestibulospinal, reticulospinal, rubrospinal, tectospinal, and medial (pontine) reticulospinal.
Step-by-step explanation:
The primary 6 descending (efferent) tracts of the spinal cord are:
- Corticospinal tract: Controls skeletal muscle movements
- Vestibulospinal tract: Regulates balance and muscle tone
- Reticulospinal tract: Modulates motor functions and autonomic responses
- Rubrospinal tract: Helps regulate muscle tone and control limb movements
- Tectospinal tract: Coordinates head and eye movements in response to visual stimuli
- Medial (pontine) reticulospinal tract: Influences spinal reflex movements and posture