Anatomy All are true about Substantia nigra except:- A Pars compacta is rich in melanin B Pallor of substantia nigra indicates Parkinsonism C Afferents are derived from caudate nucleus D Efferent fibers are rich in GABA 💡 Explanation All are true about Substantia nigra except:- ✓ Correct Answer: D. Efferent fibers are rich in GABA