Activity 4: Muscles of the Lower Limb and Identifying Muscles of the Lower Limb

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1

Muscles that act on the lower limb cause movement in which 3 parts of the body?

1. Hip

2. Knee

3. Ankle joints

2

In the shoulder girdle, what is the main group of muscles needed to stabilize it?

Mainly trunk muscles

3

Unlike the shoulder girdle, why is no special group of muscles needed to stabilize the pelvic girdle?

The pelvic girdle is made up of heavy fused bones that allow very little movement.

4

Muscles acting on the thigh (femur) cause various movements at which joint?

Hip joint

5

What are 2 muscles acting at the hip joint?

1. Iliopsoas

2. Adductor group muscles

6

Muscles acting on the leg form the major musculature of which body part?

Thigh (femur)

7

The thigh muscles cross the knee to allow which 2 movements of the leg?

1. Flexion

2. Extension

8

What are the 2 thigh muscles crossing the knee to allow flexion and extension of the leg?

1. Hamstrings

2. Quadriceps

9

The muscles on the leg also cross which joint?

Ankle joint

10

The muscles originating on the leg and the intrinsic muscles of the foot act on which 2 things?

1. Foot

2. Toes

11

Because some of the muscles acting on the leg also have attachments on the pelvic girdle, they can also cause movement at which joint?

Hip joint

12

When you extend your leg against resistance, which muscle are you using?

Anterior quadriceps femoris

13

When you flex your leg against resistance, which muscle are you using?

biceps femoris

14

Main action of rectus femoris?

1. Extend knee

15

Origin and insertion of rectus femoris?

Origin: anterior inferior iliac spine

Insertion: patella

16

Main action of vastus lateralis?

extend knee

17

Origin and insertion of vastus lateralis?

Origin: Greater trochanter

Insertion: Patella

18

Main function of vastus intermedius?

Extend knee

19

Main function of vastus medialis?

Extend knee

20

3 main functions of sartorius?

1. Flex thigh

2. Abduct thigh

3. laterally rotate thigh

21

Origin and insertion of sartorius?

Origin: Anterior iliac spine

Insertion: medial tibia

22

2 main functions of iliopsoas?

1. Flex thigh

2. Flex trunk

23

Main action of gluteus maximus?

Extend thigh

24

3 origins and insertion of gluteus maximus?

Origins: posterior ilium, sacrum, coccyx

Insertion: gluteal tuberosity of femur

25

Main function of gluteus medius?

Abduct thigh

26

Main function of gluteus minimus?

Abduct thigh

27

Main function of tensor fasciae latae?

steady trunk on thigh

28

Main function of biceps femoris?

1. Flex knee

29

Origin and insertion of biceps femoris?

Origins: ischial tuberosity

Insertion: head of fibula

30

Main function of semimembranosus?

1. Flex knee

31

Origin and insertion of semimembranosus?

Origin: Ischial tuberosity

Insertion: Medial condyle of tibia

32

Main function of semitendinosus?

1. Flex knee

33

Origin and insertion of semitendinosus?

Origin: Ischial tuberosity

Insertion: Medial tibia

34

Main action of gracilis?

Adduct thigh

35

Main action of tibialis anterior?

Dorsiflex foot

36

Origin and insertion of tibialis anterior?

Origin: lateral condyle of tibia

Insertion: medial cuneiform

37

Main function gastrocnemius?

Plantarflex foot

38

2 origins and insertion of gastrocnemius?

Origins: Medial and lateral condyles of femur

Insertion: calcaneus

39

Main function of soleus?

Plantarflex foot

40
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