When are the axons of the coicospinal tracts fully myelinated?
Axons of the coicospinal tracts are fully myelinated by the end of the second postnatal year *Babinski's sign (extensor plantar reflex) is usually elicitable before myelination of the coicospinal tracts -reflects poor coical control of motor function by the immature brain.
In the late embryonic period
In the mid-fetal period
At bih
By the end of the second postnatal year
Neuroanatomy 3