The psoas is a deep-seated core muscle connecting the lumbar vertebrae to the femur. The psoas major is the biggest and strongest player in a group of muscles called the hip flexors: together they contract to pull the thigh and the torso toward each other.
7 photos: Photos: Tallest man meets shortest man. Chandra, meet Sultan â Chandra Bahadur Dangi, at 21Â½ inches the shortest adult ever verified by Guinness World Records, poses Thursday in London with the world's tallest man, Sultan Kosen, who stands 8 feet 3 inches tall.
The 21-year-old, who suffers from dwarfism, lives with her parents Ibrahim and Hatun and was also recently certified as the second-smallest adult human alive by the Guiness Book of Records. The only adult she is taller than is Nepalese man Khagendra Thapa Magar who at 25.8 inches is the world's smallest person. 'There were no problems in my pregnancy with her and I gave birth naturally,' said her mother Hatun.