M11: Bonus Questions - Lower Extremity Muscles & Actions

Question 1

What are the muscles that make up the quadriceps?

Answer 1

rectus femoris

vastus lateralis

vastus medialis

vastus intermedius

Question 2

What are the three major hip adductors (for this class)?

Answer 2

adductor magnus

adductor longus

adductor brevis

Question 3

What are the two muscles discussed in this class that do plantar flexion?

Answer 3

gastrocnemius and soleus

Question 4

What are the muscles that make up the “hamstrings”?

Answer 4

biceps femoris

semimembranousus

semitendinosus

Question 5

Which muscles are involved in hip abduction?

(among the muscles on our class list)

Answer 5

gluteus medius and tensor fascia lata

Recall:

Gluteus medius does hip abduction and internal/medial rotation

Tensor fascia lata does hip abduction, hip flexion, and helps stabilize the knee)

Question 6

What are the main muscles responsible for both hip extension and knee flexion?

(among the muscles on our class list)

Answer 6

biceps femoris

semimembranousus

semitendinosus

Question 7

Which muscle performs hip extension, but not knee flexion?

(among the muscles on our class list)

Answer 7

gluteus maximus

Question 8

Which muscles performs hip flexion only?

(among the muscles on our class list)

Answer 8

iliopsoas

Question 9

Which main muscle performs dorsiflexion of the ankle?

Answer 9

tibilias anterior

Question 10

Which muscles perform knee extension only?

(among the muscles on our class list)

Answer 10

vastus lateralis, vastus medialis, and vastus intermedius

Note: the rectus femoris does knee extension but also does hip flexion

Question 11

Which muscles are involved in knee flexion?

(among the muscles on our class list)

Answer 11

Answer

• the “hamstrings” (biceps femoris, semimembranousus, semitendinosus)
• sartorius

Recall:

The “hamstrings” do knee flexion and hip extension

The sartorius does knee flexion, hip flexion, and external/lateral hip rotation

Question 12

Which muscle performs ankle eversion?

(among the muscles on our class list)

Answer 12

peroneals

Question 13

Which muscle performs inversion of foot/ankle?

(among the muscles on our class list)

Answer 13

tibialis anterior

Recall: the tibialis anterior does dorsiflexion of ankle, inversion of foot, and provides arch support

Question 14

Which muscle performs hip external/lateral rotation, but not hip extension?

(among the muscles on our class list)

Answer 14

Which muscle performs hip external/lateral rotation, but not hip extension?

piriformis (external/lateral rotation of hip)

also sartorius (knee flexion, hip flexion, external/lateral rotation of hip)