Anatomy 1 - Pelvis muscles Flashcards
Origin of psoas major?
- Vertebral bodies and intervertebral discs between T12-L4
- Transverse processes of L1-L5 vertebrae
Insertion of psoas major?
Lesser trochanter of femur
Function of psoas major?
- Flexion of the thigh/trunk at the hip joint
- Lateral rotation of the thigh
- Lateral flexion of the trunk
Which muscles are blended together to form iliopsoas?
Psoas major and iliacus
Origin of iliacus?
Iliac fossa (upper two-thirds)
Insertion of iliacus?
Lesser trochanter of femur (blends in with psoas major tendon)
Function of iliacus?
Flexion of the thigh/trunk
Origin of tensor fasciae latae and iliotibial tract?
- Anterior superior iliac spine (ASIS)
- Anterior outer lip of the iliac crest
Insertion of tensor fasciae latae and iliotibial tract?
TFL –> IT –> lateral condyle of tibia (Gerdy’s tubercule)
Function of TFL-iliotibial tract?
- IR of the hip
- Weak AB of the hip
- Stabilises hip/knee joints
- ER of the knee,
- Weak F/E of the knee
Origin of gluteus maximus?
- Posterior gluteal line of ilium
- Sacrotuberous ligament
- Lateral posterior surface of sacrum and coccyx
Insertion of gluteus maximus?
- Upper fibers: iliotibial tract
- Lower: gluteal tuberosity of femur
Function of gluteus maximus?
- E
- ER
- AB of the hip
Origin of gluteus medius?
Gluteal surface of ilium (btw posterior and anterior gluteal lines)
Insertion of gluteus medius?
Lateral surface of the greater trochanter of the femur
Function of gluteus medius?
- AB of the hip
- E of the hip
- Stabilises hip joint
- (anterior fibers: assist in IR // posterior: assist in ER)
Origin of gluteus minimus?
Gluteal surface of ilium (btw anterior and inferior gluteal lines)
Insertion of gluteus minimus?
Anterior surface of the greater trochanter of the femur
Function of gluteus minimus?
- AB of the hip
- Stabilises hip joint
- (anterior fibers: assist in IR // posterior: assist in ER)
What is the gluteal aponeurosis?
- Dense fibrous membrane
- Laying btw the iliac crest - superior border of gluteus maximus (over gluteus medius)
- Belongs to fasciae latae
Origin of piriformis?
- Anterior surface of sacrum S2-S4
- Gluteal surface of ilium (close to PIIS posterior inferior iliac spine)
Insertion of piriformis?
Apex of greater trochanter of femur
Function of piriformis?
- When extended hip: ER of the femur
- When flexed hip: AB of the femur
- Stabilises hip joint
Origin of obturator internus?
Posterior surface of the obturator foramen (across pubis and ischium)
Insertion of obturator internus?
Medial surface of the greater trochanter of femur (right above trochanteric fossa)
Function of obturator internus?
- When extended hip: ER
- When flexed hip: AB
- Stabilises hip joint
(like piriformis and kinda same as obturator exter.)
Origin of obturator externus?
- Anterior surface of the obturator foramen
- Bony boundaries of obturator foramen
Insertion of obturator externus?
Trochanteric fossa of the femur
Function of obturator externus?
- ER of the hip
- When hip flexed: AB of the hip
- Stabilises hip joint
Origin of superior gemellus?
Ischial spine (blends with tendons of the obturator internus)
Insertion of superior gemellus?
Medial surface of the greater trochanter of femur (via tendons of the obturator internus)
Function of superior gemellus?
- ER of the hip
- When hip flexed: AB of the hip
- Stabilises head of femur in acetabulum
Origin of inferior gemellus?
Ischial tuberosity
Insertion of inferior gemellus?
Medial surface of greater trochanter of femur (via tendon of obturator internus)
Function of inferior gemellus?
- ER of the hip
- When hip flexed: AB of the hip
- Stabilises femoral head in acetabulum
Origin of quadratus femoris?
Lateral border of ischial tuberosity
Insertion of quadratus femoris?
Intertrochanteric crest of femur
Function of quadratus femoris?
- ER of the hip
- AD “”
- Stabilises head of femur in acetabulum
