Posterior femoral cutaneous nerve
Plexus: Lumbosacral
Roots:
S1
S2
S3
S4
Origin: Dorsal divisions of S1, S2 and ventral divisions of S3, S4
Sensory innervation:
Posterior surface of thigh
Branch: Posterior femoral cutaneous nerve
Roots:
S1
S2
S3
S4
Lower part of buttocks
Branch: Inferior cluneal nerves
Roots:
S1
S2
S3
S4