Anatomy - Pelvis

Question 1

Greater sciatic foramen - suprapiriform

Answer 1

Superior gluteal vessels

Superior gluteal nerve

Question 2

Greater sciatic foramen - infrapiriform

Answer 2

Inferior gluteal vessels
Inferior gluteal nerve (L5-S1-S2)
Sciatic nerve (L4-S3)
Nerve to obturator internus (L5-S1-S2)
Nerve to quadratus femoris (L4-L5-S1)

Question 3

Lesser sciatic foramen

Answer 3

Tendon of obturator internus
Internal pudendal vessels 
Pudendal nerve (S2-S3-S4)

Question 4

Structures crossing to BACK of ischial spine

Answer 4

Nerve to obturator internus

Question 5

Sacral plexus

Answer 5

L4-S4
Direct nerves:
- Superior gluteal nerve
- Inferior gluteal nerve 
- 3x muscular branches - piriformis, obturator internus, quadratus femoris 

Sciatic nerve:

• Sciatic nerve proper (L4-S3)
• Common fibular n.
• • Superficial fibular n.
• • Deep fibular n.
• Tibial n.
• • Medial plantar
• • Lateral plantar

Pudenal and coccygeal nerves