Pelvis MOI Flashcards
Origin of psoas major
Bodies and transverse processes of the lumbar vertebrae.
Insertion of psoas major
Lesser trochanter
Actions of psoas major
Flex the hip and potentially laterally rotate the hip. Flex the trunk, anteriorly tilt the pelvis and assists to unilaterally side bend the lumbar spine.
Innervation of psoas major
Lumbar plexus
Origin of biceps femoris
Ischial tuberosity (long head) and lateral lip of the linea aspera (short head)
Insertion of biceps femoris
Head of the fibula
Actions of the biceps femoris
Flex and laterally rotate the flexed knee. The long head also extends and laterally rotates the hip and posteriorly tilts the pelvis.
Innervation of the biceps femoris
Sciatic nerve. The tibial branch for the long head and the fibular branch for the short head.
Piriformis origin
Anterior surface of the sacrum
Piriformis insertion
Superior aspect of the greater trochanter
Piriformis actions
Laterally rotate the hip and abduct the hip when the hip is already flexed.
Piriformis innervation
Sacral plexus
Tensor fasciae latae origin
Iliac crest, just posterior to the ASIS
Tensor fasciae latae insertion
Iliotibial tract
Tensor fasciae latae innervation
Superior gluteal nerve
Tensor fasciae latae actions
Flex, medially rotate and abduct the hip.
Rectus femoris origin
ASIS
Rectus femoris insertion
Tibial tuberosity via the patella and patellar ligament
Rectus femoris actions
Extend the knee and flex the hip
Rectus femoris innervation
Femoral
Gluteus medius origin
Gluteal surface of the ilium, between the posterior and anterior gluteal lines. Just below the iliac crest.
Gluteus medius insertion
Lateral aspect of the greater trochanter
Gluteus medius innervation
Superior gluteal nerve
Gluteus medius actions
All fibers abduct. Anterior fibers flex and medially rotate. Posterior fibers extend and laterally rotate the hip.
Semitendinosus origin
Ischial tuberosity
Semitendinosus actions
Flex and medially rotate the flexed knee, extend and medially rotate the hip, tilt the pelvis posteriorly.
Semitendinosus insertion
Proximal, medial shaft of the tibia at the pes anserinus tendon
Semitendinosus innervation
Sciatic nerve
Semimembranosus origin
Ischial tuberosity
Semimembranosus insertion
Posterior aspect of the medial condyle of the tibia
Semimembranosus actions
Flex and medially rotate the flexed knee, extend and medially rotate the hip, tilt the pelvis posteriorly.
Semimenbranosus innervation
Sciatic nerve (tibial branch)
Multifidi origin
Sacrum and transverse processes of the lumbar through cervical vertebrae
Multifidi insertion
Spinous processes of the lumbar vertebrae through the second cervical vertibrae. Each spans 2-4 vertebrae.
Multifidi actions
Unilaterally rotate to the opposite side. Bilaterally extend the vertebral column.
Multifidi innervation
Spinal nerves
Quadratus lumborum origin
Posterior iliac crest
Quadratus lumborum insertion
Last rib and the transverse processes of first through fourth lumbar vertebrae.
Quadratus lumborum actions
Unilaterally tilit the pelvis and laterally flex the vertebral column. Bilaterally fixes the last rib and extends the vertebral column.
Quadratus lumborum innervation
Lumbar plexus
Iliacus origin
Iliac fossa
Iliacus insertion
Lesser trochanter
Iliacus actions
Flex and laterally rotate the hip. Flex the trunk and tilt the pelvis anteriorly.
Iliacus innervation
Femoral nerve
Gluteus minimus origin
Gluteal surface of the ilium between the anterior and inferior gluteal lines
Gluteus minimus insertion
Anterior aspect of the greater trochanter
Gluteus minimus actions
Abduct, medially rotate and flex the hip.
Gluteus minimus innervation
Superior gluteal nerve
