Anatomy 1 - Pelvis muscles

Question 1

Origin of psoas major?

Answer 1

• Vertebral bodies and intervertebral discs between T12-L4
• Transverse processes of L1-L5 vertebrae

Question 2

Insertion of psoas major?

Answer 2

Lesser trochanter of femur

Question 3

Function of psoas major?

Answer 3

• Flexion of the thigh/trunk at the hip joint
• Lateral rotation of the thigh
• Lateral flexion of the trunk

Question 4

Which muscles are blended together to form iliopsoas?

Answer 4

Psoas major and iliacus

Question 5

Origin of iliacus?

Answer 5

Iliac fossa (upper two-thirds)

Question 6

Insertion of iliacus?

Answer 6

Lesser trochanter of femur (blends in with psoas major tendon)

Question 7

Function of iliacus?

Answer 7

Flexion of the thigh/trunk

Question 8

Origin of tensor fasciae latae and iliotibial tract?

Answer 8

• Anterior superior iliac spine (ASIS)
• Anterior outer lip of the iliac crest

Question 9

Insertion of tensor fasciae latae and iliotibial tract?

Answer 9

TFL –> IT –> lateral condyle of tibia (Gerdy’s tubercule)

Question 10

Function of TFL-iliotibial tract?

Answer 10

• IR of the hip
• Weak AB of the hip
• Stabilises hip/knee joints
• ER of the knee,
• Weak F/E of the knee

Question 11

Origin of gluteus maximus?

Answer 11

• Posterior gluteal line of ilium
• Sacrotuberous ligament
• Lateral posterior surface of sacrum and coccyx

Question 12

Insertion of gluteus maximus?

Answer 12

• Upper fibers: iliotibial tract
• Lower: gluteal tuberosity of femur

Question 13

Function of gluteus maximus?

Answer 13

• E
• ER
• AB of the hip

Question 14

Origin of gluteus medius?

Answer 14

Gluteal surface of ilium (btw posterior and anterior gluteal lines)

Question 15

Insertion of gluteus medius?

Answer 15

Lateral surface of the greater trochanter of the femur

Question 16

Function of gluteus medius?

Answer 16

• AB of the hip
• E of the hip
• Stabilises hip joint
• (anterior fibers: assist in IR // posterior: assist in ER)

Question 17

Origin of gluteus minimus?

Answer 17

Gluteal surface of ilium (btw anterior and inferior gluteal lines)

Question 18

Insertion of gluteus minimus?

Answer 18

Anterior surface of the greater trochanter of the femur

Question 19

Function of gluteus minimus?

Answer 19

• AB of the hip
• Stabilises hip joint
• (anterior fibers: assist in IR // posterior: assist in ER)

Question 20

What is the gluteal aponeurosis?

Answer 20

• Dense fibrous membrane
• Laying btw the iliac crest - superior border of gluteus maximus (over gluteus medius)
• Belongs to fasciae latae

Question 21

Origin of piriformis?

Answer 21

• Anterior surface of sacrum S2-S4
• Gluteal surface of ilium (close to PIIS posterior inferior iliac spine)

Question 22

Insertion of piriformis?

Answer 22

Apex of greater trochanter of femur

Question 23

Function of piriformis?

Answer 23

• When extended hip: ER of the femur
• When flexed hip: AB of the femur
• Stabilises hip joint

Question 24

Origin of obturator internus?

Answer 24

Posterior surface of the obturator foramen (across pubis and ischium)

Question 25

Insertion of obturator internus?

Answer 25

Medial surface of the greater trochanter of femur (right above trochanteric fossa)

Question 26

Function of obturator internus?

Answer 26

- When extended hip: ER - When flexed hip: AB - Stabilises hip joint (like piriformis and kinda same as obturator exter.)

Question 27

Origin of obturator externus?

Answer 27

- Anterior surface of the obturator foramen - Bony boundaries of obturator foramen

Question 28

Insertion of obturator externus?

Answer 28

Trochanteric fossa of the femur

Question 29

Function of obturator externus?

Answer 29

- ER of the hip - When hip flexed: AB of the hip - Stabilises hip joint

Question 30

Origin of superior gemellus?

Answer 30

Ischial spine (blends with tendons of the obturator internus)

Question 31

Insertion of superior gemellus?

Answer 31

Medial surface of the greater trochanter of femur (via tendons of the obturator internus)

Question 32

Function of superior gemellus?

Answer 32

- ER of the hip - When hip flexed: AB of the hip - Stabilises head of femur in acetabulum

Question 33

Origin of inferior gemellus?

Answer 33

Ischial tuberosity

Question 34

Insertion of inferior gemellus?

Answer 34

Medial surface of greater trochanter of femur (via tendon of obturator internus)

Question 35

Function of inferior gemellus?

Answer 35

- ER of the hip - When hip flexed: AB of the hip - Stabilises femoral head in acetabulum

Question 36

Origin of quadratus femoris?

Answer 36

Lateral border of ischial tuberosity

Question 37

Insertion of quadratus femoris?

Answer 37

Intertrochanteric crest of femur

Question 38

Function of quadratus femoris?

Answer 38

- ER of the hip - AD "" - Stabilises head of femur in acetabulum