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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 .
Piriformis muscle spasm may compress the sciatic nerve. [20] As the piriformis muscle spasms, it shortens and becomes harder, applying greater pressure on the sciatic nerve against the ischium at the inferior greater sciatic foramen. The empirical evidence supporting this is that patients can often see immediate and permanent relief from local ...
The piriformis nerve, also known as the nerve to piriformis, is the peripheral nerve that provides motor innervation to the piriformis muscle. Structure Origin ...
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.
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 ]
When the piriformis shortens or spasms due to trauma or overuse, it is posited that this causes compression of the sciatic nerve. [16] Piriformis syndrome has colloquially been referred to as "wallet sciatica" since a wallet carried in a rear hip pocket compresses the buttock muscles and sciatic nerve when the bearer sits down. Piriformis ...
Piriformis muscle, a gluteal muscle Piriformis syndrome, a neuromuscular disorder in which the piriformis muscle compresses the sciatic nerve; Piriform sinus, piriform recess or piriform fossa, synonyms referring to one of the four sites of the hypopharynx; The (notionally) pear-like female body shape (gynoid shape)
The inferior gluteal nerve reliably emerged inferior to the piriformis muscle. The branching characteristics of the nerve falls into two broad categories.One category is short stalks which came under the piriformis and then gave rise to all of the terminal branches of the nerve which spanned the muscle of the gluteus maximus.