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Piriformis – Attachments, Actions & Innervation

image descriptionPiriformis

Posterior view of the thigh and gluteal region. Labelled muscles: gluteus maximus, gluteus medius, tensor fasciae latae, gracilis, iliotibial tract (band), semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Posterior view of the thigh and gluteal region. Labelled muscle: piriformis
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image descriptionAttachments of Piriformis: Origin & Insertion

Origin: (proximal attachments)
a.Anterior surface of lateral sacrum.

Insertion: (distal attachments)
a.Greater trochanter of femur, along its upper medial surface.

Posterior view of the thigh and gluteal region. Labelled muscles: gluteus maximus, gluteus medius, tensor fasciae latae, gracilis, iliotibial tract (band), semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Posterior view of the thigh and gluteal region. Labelled muscle: piriformis
Posterior view of thigh and gluteal region. Origin and insertion of piriformis labelled.
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Actions of Piriformis on the thigh (femur):

a. image descriptionLaterally Rotates thigh at the hip.

b. image descriptionAbducts thigh if hip is flexed.

Nerve to Muscle and its Spinal Segment:

a. Branch of sacral plexus (S1, S2).

An Overview of the Posterior Muscles of the Thigh:

Test yourself image 1, posterior view of thigh and gluteal region showing all superficial muscles with no labels.
Test yourself image 2, posterior view of thigh and gluteal region, all superficial muscles and structures labelled- gluteus medius, tensor fasciae latae, gluteus maximus, gracilis, iliotibial tract (band), semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 3, posterior view of thigh and gluteal region, lateral rotators of the thigh visible. Muscles and structures labelled- gluteus medius, tensor fasciae latae, gluteus maximus, gracilis, iliotibial tract (band), semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 4, posterior view of thigh and gluteal region, lateral rotators of the thigh visible. Muscles and structures labelled- gluteus medius, tensor fasciae latae, gracilis, iliotibial tract (band), semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 5, posterior view of thigh and gluteal region, lateral rotators of the thigh visible. Muscles and structures labelled- gluteus medius, piriformis, quadratus femoris, gracilis, semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 6, posterior view of thigh and gluteal region, lateral rotators of the thigh visible. Muscles and structures labelled- gluteus medius, piriformis, quadratus femoris, gracilis, semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 7, posterior view of thigh and gluteal region, lateral rotators of the thigh visible. Muscles and structures labelled- gluteus minimus, piriformis, quadratus femoris, gracilis, semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 8, posterior view of thigh and gluteal region, lateral rotators of the thigh visible. Muscles labelled- piriformis, quadratus femoris, gracilis, semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 9, posterior view of thigh and gluteal region. Muscles labelled- piriformis, gracilis, semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 10, posterior view of thigh and gluteal region. Muscles labelled- piriformis, semimembranosus, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 11, posterior view of thigh and gluteal region. Muscles labelled- piriformis, gracilis, semitendinosus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 12, posterior view of thigh and gluteal region. Muscles labelled- piriformis, adductor magnus, biceps femoris: short head, biceps femoris: long head, gastrocnemius.
Test yourself image 13, posterior view of thigh and gluteal region. Muscles labelled- piriformis, adductor magnus, gastrocnemius.
Test yourself image 14, posterior view of thigh and gluteal region. Muscles labelled- piriformis, adductor magnus.
Test yourself image 15, posterior view of thigh and gluteal region. Muscles labelled- piriformis.
Test yourself image 16, posterior view of skeleton of thigh and gluteal region.
Test yourself image 17. Anterior view of pelvis and thigh. Origin and insertion of piriformis labelled.
Test yourself while observing the Piriformis muscle
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