Pelvis MOI

Question 1

Origin of psoas major

Answer 1

Bodies and transverse processes of the lumbar vertebrae.

Question 2

Insertion of psoas major

Answer 2

Lesser trochanter

Question 3

Actions of psoas major

Answer 3

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.

Question 4

Innervation of psoas major

Answer 4

Lumbar plexus

Question 5

Origin of biceps femoris

Answer 5

Ischial tuberosity (long head) and lateral lip of the linea aspera (short head)

Question 6

Insertion of biceps femoris

Answer 6

Head of the fibula

Question 7

Actions of the biceps femoris

Answer 7

Flex and laterally rotate the flexed knee. The long head also extends and laterally rotates the hip and posteriorly tilts the pelvis.

Question 8

Innervation of the biceps femoris

Answer 8

Sciatic nerve. The tibial branch for the long head and the fibular branch for the short head.

Question 9

Piriformis origin

Answer 9

Anterior surface of the sacrum

Question 10

Piriformis insertion

Answer 10

Superior aspect of the greater trochanter

Question 11

Piriformis actions

Answer 11

Laterally rotate the hip and abduct the hip when the hip is already flexed.

Question 12

Piriformis innervation

Answer 12

Sacral plexus

Question 13

Tensor fasciae latae origin

Answer 13

Iliac crest, just posterior to the ASIS

Question 14

Tensor fasciae latae insertion

Answer 14

Iliotibial tract

Question 15

Tensor fasciae latae innervation

Answer 15

Superior gluteal nerve

Question 15

Tensor fasciae latae actions

Answer 15

Flex, medially rotate and abduct the hip.

Question 16

Rectus femoris origin

Answer 16

ASIS

Question 17

Rectus femoris insertion

Answer 17

Tibial tuberosity via the patella and patellar ligament

Question 18

Rectus femoris actions

Answer 18

Extend the knee and flex the hip

Question 19

Rectus femoris innervation

Answer 19

Femoral

Question 20

Gluteus medius origin

Answer 20

Gluteal surface of the ilium, between the posterior and anterior gluteal lines. Just below the iliac crest.

Question 21

Gluteus medius insertion

Answer 21

Lateral aspect of the greater trochanter

Question 22

Gluteus medius innervation

Answer 22

Superior gluteal nerve

Question 22

Gluteus medius actions

Answer 22

All fibers abduct. Anterior fibers flex and medially rotate. Posterior fibers extend and laterally rotate the hip.

Question 23

Semitendinosus origin

Answer 23

Ischial tuberosity

Question 24

Semitendinosus actions

Answer 24

Flex and medially rotate the flexed knee, extend and medially rotate the hip, tilt the pelvis posteriorly.

Question 24

Semitendinosus insertion

Answer 24

Proximal, medial shaft of the tibia at the pes anserinus tendon

Question 25

Semitendinosus innervation

Answer 25

Sciatic nerve

Question 26

Semimembranosus origin

Answer 26

Ischial tuberosity

Question 27

Semimembranosus insertion

Answer 27

Posterior aspect of the medial condyle of the tibia

Question 28

Semimembranosus actions

Answer 28

Flex and medially rotate the flexed knee, extend and medially rotate the hip, tilt the pelvis posteriorly.

Question 29

Semimenbranosus innervation

Answer 29

Sciatic nerve (tibial branch)

Question 30

Multifidi origin

Answer 30

Sacrum and transverse processes of the lumbar through cervical vertebrae

Question 31

Multifidi insertion

Answer 31

Spinous processes of the lumbar vertebrae through the second cervical vertibrae. Each spans 2-4 vertebrae.

Question 32

Multifidi actions

Answer 32

Unilaterally rotate to the opposite side. Bilaterally extend the vertebral column.

Question 33

Multifidi innervation

Answer 33

Spinal nerves

Question 34

Quadratus lumborum origin

Answer 34

Posterior iliac crest

Question 35

Quadratus lumborum insertion

Answer 35

Last rib and the transverse processes of first through fourth lumbar vertebrae.

Question 36

Quadratus lumborum actions

Answer 36

Unilaterally tilit the pelvis and laterally flex the vertebral column. Bilaterally fixes the last rib and extends the vertebral column.

Question 37

Quadratus lumborum innervation

Answer 37

Lumbar plexus

Question 38

Iliacus origin

Answer 38

Iliac fossa

Question 39

Iliacus insertion

Answer 39

Lesser trochanter

Question 40

Iliacus actions

Answer 40

Flex and laterally rotate the hip. Flex the trunk and tilt the pelvis anteriorly.

Question 41

Iliacus innervation

Answer 41

Femoral nerve

Question 42

Gluteus minimus origin

Answer 42

Gluteal surface of the ilium between the anterior and inferior gluteal lines

Question 43

Gluteus minimus insertion

Answer 43

Anterior aspect of the greater trochanter

Question 44

Gluteus minimus actions

Answer 44

Abduct, medially rotate and flex the hip.

Question 45

Gluteus minimus innervation

Answer 45

Superior gluteal nerve