Lecture 8: Muslces Of The Lower Extremities Flashcards
What is the only quadriceps muscle that does hip flexion?
Rectus femoris
What is the origin, insertion, and action of the Sartorius muscle?
O: ASIS (Anterior Sup. Iliac Spine)
I: Medial aspect of proximal tibia
A: Flexes, Abducts, and laterally rotates thigh, flexes leg
What are all the muscles of the quadriceps group?
Rectus femoris, Vastus lateralis, Vastus intermedius, Vastus medialis
What is the origin, insertion, and action of the Rectus femoris muscle?
O: AIIF (Anterior Inf. Iliac Spine), superior margin of acetabulum
I: patella and tibial tuberosity
A: Extends leg and flexes thigh
What is the origin, insertion, and action of the Vastus lateralis muscle?
O: greater trochanter, intertrochanteric line, linea aspera
I: same as Rectus femoris
A: Extends leg and flexes thigh
What is the origin, insertion, and action of the Vastus intermedius muscle?
O: anterior and lateral surfaces of the shaft of the femur (proximal)
I: same as Rectus femoris
A: Extends leg
What is the origin, insertion, and action of the Vastus medialis muscle?
O: linea aspera, medial supracondylar line, intertrochanteric line
I: same as Rectus femoris
A: Extends leg (same as intermedius)
What are all the 2 major important muscles part of the Iliopsoas group?
1) Iliacus muscle
2) Psoas major muscle (minor is not that important)
a) What group does the Iliacus muscle belong to?
b) What is the origin, insertion, and action of this muscle
a) The Iliopsoas group
b) O: Iliac fossa, ala of sacrum
I: lesser trochanter
A: Flexes thigh at hip joint (prime mover in thigh flexion), flexes trunk
What are all the 10 hip flexor muscles?
1) The 3 Iliopsoas muscles
2) Rectus fermoris
3) Sartorius
4) Pactineus
5) Gracilis
6) The Adductor muscles (Longus and Magnus)
a) What group does the Psoas major muscle belong to?
b) What is the origin, insertion, and action of this muscle
a) The Iliopsoas group
b) O: Transverse processes, bodies and discs of lumbar vertebrae
I: same as Iliacus (lesser trochanter)
A: Major flexor of the hip joint
What is the origin, insertion, and actions of this muscle of the Tensor Fasciae Latae?
O: ASIS
I: Iliotibial tract
A: Flexes leg, Abducts thigh, Medially rotates the thigh
What is the origin, insertion, and actions of the Pectineus muscle?
O: Pectineal line of pubis and superior ramus
I: A line from lesser trochanter to linea aspera
A: Adducts, flexes and medially rotates thigh
What are the three Adductor muscles?
Adductor Longus, Adductor Brevis and Adductor Magnus
What is the origin, insertion, and actions of the Gracilis?
O: Body of pubis, inferior pubic ramus and ischial ramus
I: medial surface of tibia
A: Adducts thigh, flexes and and medially rotates LEG
What is the origin, insertion, and actions of the Adductor Longus ?
O: Near pubic symphysis
I: Linea aspera
A: Same as Pectineus ( Adducts, flexes and medially rotates thigh)
What is the origin, insertion, and actions of the Adductor Brevis ?
O: Body and Inferior ramus of pubis
I: Linea aspera
A: Adducts and medially rotates thigh
What is the origin, insertion, and actions of the Adductor Magnus ?
O: Ischial and pubic rami and ischial tuberosity
I: Linea aspera, supracondylar line, and it’s the only one that inserts in the adductor tubercle of femur
A: Same as Adductor Longus and also works with the hamstrings in thigh extension
a) What are does the hamstring group muscles consist of?
b) What action do they all have in common?
a) Biceps femoris, Semitendinosus, Semimembranosus
b) They all extend the thigh and flex the leg
What is the origin and insertion of the Biceps femoris
O: Ischial tuberosity, linea astera
I: Head of fibula and lateral condyle of tibia
What is the origin and insertion of the Semitendinosus
O: Ischial tuberosity
I: Medial aspect of the upper tibial shaft
What is the origin and insertion of the Semimembranosus
O: Same as Semitendinosus (Ischial tuberosity)
I: medial condyle of the tibia
What is the origin, insertion and action of the Gluteus Maximus
O: Dorsal ilium, sacrum, and coccyx
I: gluteal tuberosity on the femur, iliotibial tract
A:Major extensor of the thigh
What is the origin, insertion and action of the Gluteus Medius
O: Between anterior and posterior gluteal lines of the ilium
I: lateral aspect of greater trochanter
A: Abducts and medially rotates thigh
