Pelvis & Thigh Flashcards
Rectus Femoris
•ACTION
Extend the knee
Flex the hip
•ORIGIN
Anterior inferior iliac spine (AIlS)
•INSERTION
Tibial tuberosity (via the patella and patellar ligament)
•NERVE
Femoral L2, 3, 4
Vastus Medialis
•ACTION
Extend the knee
•ORIGIN
Medial lip of linea aspera
•INSERTION
Tibial tuberosity (via the patella and patellar ligament)
•NERVE
Femoral L2, 3, 4
Vastus Lateralis
•ACTION
Extend the knee
•ORIGIN
Lateral lip of linea aspera, gluteal tuberosity, and greater trochanter
•INSERTION
Tibial tuberosity (via the patella and patellar ligament)
•NERVE
Femoral L2, 3, 4
Vastus Intermedius
•ACTION
Extend the knee
•ORIGIN
Anterior and lateral shaft of the femur
•INSERTION
Tibial tuberosity (via the patella and patellar ligament)
•NERVE
Femoral L2, 3, 4
Biceps Femoris
•ACTION
Flex the knee
Laterally rotate the flexed knee
Long head:
Extend the hip
Long head:
Assist to laterally rotate the hip
Tilt the pelvis posteriorly
•ORIGIN
Long head: Ischial tuberosity
Short head: Lateral lip of linea aspera
•INSERTION
Head of the fibula
•NERVE
Long head: Sciatic (tibial branch) L5, S1, 2, 3
Short head: Sciatic (fibular branch) L5, S1, 2
Semitendinosus
•ACTION
Flex the knee
Medially rotate the flexed knee
Extend the hip
Assist to medially rotate the hip
Tilt the pelvis posteriorly
•ORIGIN
Ischial tuberosity
•INSERTION
Proximal, medial shaft of the tibia at pes anserinus tendon
•NERVE
Sciatic (tibial branch) L4, 5, S1, 2
Semimembranosus
•ACTION
Flex the knee
Medially rotate the flexed knee
Extend the hip
Assist to medially rotate the hip
Tilt the pelvis posteriorly
•ORIGIN
Ischial tuberosity
•INSERTION
Posterior aspect of medial condyle of tibia
•NERVE
Sciatic (tibial branch) L4, 5, S1, 2
Gluteus Maximus
•ACTION
All fibers:
Extend, Laterally rotate, Abduct the hip
Lower fibers:
Adduct the hip
•ORIGIN
Coccyx, edge of sacrum, posterior iliac crest, sacrotuberous and sacroiliac ligaments
•INSERTION
liotibial tract (upper fibers) and gluteal tuberosity (lower fibers)
•NERVE
Inferior gluteal L5, S1, 2
Gluteus Medius
•ACTION
All fibers:
Abduct the hip
Anterior fibers:
Flex and Medially rotate the hip
Posterior fibers:
Extend and Laterally rotate the hip
•ORIGIN
Gluteal surface of ilium, between posterior and anterior gluteal lines, just below the iliac crest
•INSERTION
Lateral aspect of greater trochanter
•NERVE
Superior gluteal L4, 5, S1
Gluteus Minimus
•ACTION
Abduct, Medially rotate, Flex the hip
•ORIGIN
Gluteal surface of the ilium between the anterior and inferior gluteal lines
•INSERTION
Anterior aspect of greater trochanter
•NERVE
Superior gluteal L4, 5, S1
Adductor Magnus
•ACTION
Adduct and Medially rotate the hip
Assist to flex the hip
Posterior fibers:
Extend the hip
•ORIGIN
Inferior ramus of the pubis, ramus of ischium, and ischial tuberosity
•INSERTION
Medial lip of linea aspera and adductor tubercle
•NERVE
Obturator L2, 3, 4 and sciatic L4, 5, S1
Adductor Longus
•ACTION
Adduct and Medially rotate the hip
Assist to flex the hip
•ORIGIN
Pubic tubercle
•INSERTION
Medial lip of linea aspera
•NERVE
Obturator L2, 3, 4
Adductor Brevis
•ACTION
Adduct and Medially rotate the hip
Assist to flex the hip
•ORIGIN
Inferior ramus of pubis
•INSERTION
Pectineal line and medial lip of linea aspera
•NERVE
Obturator L2, 3,4
Pectineus
•ACTION
Adduct and Medially rotate the hip
Assist to flex the hip
•ORIGIN
Superior ramus of pubis
•INSERTION
Pectineal line of femur
•NERVE
Femoral and obturator L2, 3, 4
Gracilis
•Action
Adduct the hip
Medially rotate the hip
Flex the knee
Medially rotate the flexed knee
•Origin
Inferior ramus of pubis
•Insertion
Proximal, medial shaft of tibia at pes anserinus tendon
•Nerve
Obturator L2, 3, 4
Tensor Fasciae Latae
•Action
Flex the hip
Medially rotate the hip
Abduct the hip
•Origin
lliac crest, posterior to the ASIS
•Insertion
Iliotibial tract
•Nerve
Superior gluteal L4, 5, S1
Sartorius
•Action
Flex the hip
Laterally rotate the hip
Abduct the hip
Flex the knee
Medially rotate the flexed knee
•Origin
Anterior superior iliac spine (ASIS)
•Insertion
Proximal, medial shaft of the tibia at pes anserinus tendon
•Nerve
Femoral L2, 3, (4)
Piriformis
•Action
Laterally rotate the hip
Abduct the hip when the hip is flexed
•Origin
Anterior surface of sacrum
•Insertion
Superior aspect of greater trochanter
•Nerve
Sacral plexus L(5), S1, 2
Quadratus Femoris
•Action
Laterally rotate the hip
•Origin
Lateral border of ischial tuberosity
•Insertion
Intertrochanteric crest, between the greater and lesser trochanters
•Nerve
Sacral plexus L4, 5, S1, (2)
Obturator Internus
•Action
Laterally rotate the hip
Obturator membrane and inferior surface of obturator foramen
•Origin
Medial surface of greater trochanter
•Nerve
Sacral plexus L5, S1, 2
Obturator Externus
•Action
Laterally rotate the hip
•Origin
Rami of pubis and ischium, obturator membrane
•Insertion
Trochanteric fossa of femur
•Nerve
Obturator L3, 4
Gemellus Superior
•Action
Laterally rotate the hip
•Origin
Ischial spine
•Insertion
Medial surface of greater trochanter
•Nerve
Sacral plexus L5, S1, 2
Gemellus Inferior
•Action
Laterally rotate the hip
•Origin
Ischial tuberosity
•Insertion
Medial surface of greater trochanter
•Nerve
Sacral plexus L4, 5, S1, (2)
Psoas Major
•Action
With the origin fixed:
Flex the hip
May laterally rotate the hip
With the insertion fixed:
Flex the trunk toward the thigh
Tilt pelvis anteriorly
Unilaterally:
Assist to laterally flex the lumbar spine
•Origin
Bodies and TP of lumbar vertebrae
•Insertion
Lesser trochanter
•Nerve
Lumbar plexus L1, 2, 3, 4
Iliacus
•Action
With the origin fixed:
Flex the hip
May laterally rotate the hip
With the insertion fixed:
Flex the trunk toward the thigh
Tilt pelvis anteriorly
•Origin
Iliac fossa
•Insertion
Lesser trochanter
•Nerve
Femoral L (1), 2, 3, 4
Psoas Minor
•Action
Assist to create lordotic curvature in the lumbar spine
Tilt pelvis posteriorly
•Origin
Body and transverse process of first lumbar vertebra
•Insertion
Superior ramus of pubis
•Nerve
Lumbar plexus L1, 2
