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The piriformis muscle (from Latin piriformis 'pear-shaped') is a flat, pyramidally-shaped muscle in the gluteal region of the lower limbs. It is one of the six muscles in the lateral rotator group . The piriformis muscle has its origin upon the front surface of the sacrum , and inserts onto the greater trochanter of the femur .
The lateral rotator group is a group of six small muscles of the hip which all externally (laterally) rotate the femur in the hip joint.It consists of the following muscles: piriformis, gemellus superior, obturator internus, gemellus inferior, quadratus femoris and the obturator externus.
Injections deliver medication directly to the piriformis muscle through a needle. The needle is placed into the piriformis muscle with image guidance such as fluoroscopy, ultrasound, CT, or MRI. [2] [30] Ultrasound is a popular choice due to a balance of accuracy, accessibility, lack of radiation exposure, and affordability. [29] [2]
The piriformis is a muscle that runs down from the lower spine to the butt and to the top of the thighs. The muscle extends to each side of your body and is used in almost every movement of the ...
As an example of the diagnostic improvement of MRN, when MRI is used to assess piriformis muscle asymmetry, it has 46% sensitivity and 66% specificity for piriformis syndrome. When MRN is used and includes unilateral sciatic nerve hyperintensity at the sciatic notch, the sensitivity increases to 64% and the specificity increases to 93%. [ 3 ]
The greater sciatic foramen is an opening in the posterior human pelvis.It is formed by the sacrotuberous and sacrospinous ligaments.The piriformis muscle passes through the foramen and occupies most of its volume.
The superficial branch passes over the piriformis muscle. [2] It enters the deep surface of the gluteus maximus muscle, and divides into numerous branches. [2] Some branches supply the muscle and anastomose with the inferior gluteal artery, while others perforate its tendinous origin, and supply the integument covering the posterior surface of the sacrum, anastomosing with the posterior ...
The muscle is supplied by the inferior gluteal nerve which arises from the dorsal branches of the ventral rami of the fifth (L5), the first and second sacral nerves. [2]The lumbosacral trunk, which is made up of L5 and a small branch of L4, effectively connects the lumbar and sacral plexuses. [3]