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What is Sacral ala is related to and explain in detail?
Ans. is 'd' i.e., Iliolumbar aery,Ala of sacrum is a large triangular surface either side of sacral base, continuous with iliac fossa (akin to adapted and joined transverse and costal processes elsewhere spine)The smooth medial pa of the ala of sacrum is associated with the subsequent 4 structures from medial to lateral side: 1. Sympathetic chain. 2. Lumbosacral trunk. 3. Iliolumbar aery. 4. Obturator nerve.The ventral ramus of L5 nerve is really tight that it grooves the ala.The rough lateral pa of the ala provides origin to iliacus muscle anteriorly and connection to the lumbosacral ligament posteriorly.