Question 1

Which muscle is the largest and most superficial of the gluteal region, and what is its primary action?

Accepted Answer

Gluteus maximus; extension and lateral rotation of the thigh

Question 2

The quadriceps femoris group shares a common insertion and is responsible for which primary action at the knee joint?

Accepted Answer

Extension of the leg

Question 3

Which muscle acts to 'unlock' the knee by medially rotating the leg?

Accepted Answer

Popliteus

Question 4

A patient presents with difficulty in dorsiflexing the foot and extending the toes. Which muscle is most likely affected?

Accepted Answer

Tibialis anterior

Question 5

Which muscle group is antagonistic to the quadriceps femoris in the movement of the leg?

Accepted Answer

Hamstrings

Question 6

The 'Tom, Dick, and Harry' mnemonic helps identify tendons passing posterior to the medial malleolus. Which of the following is NOT one of these muscles?

Accepted Answer

Extensor digitorum longus

Question 7

Which muscle is deep to the semitendinosus and shares the same origin as the other hamstring muscles?

Accepted Answer

Semimembranosus

Question 8

A soccer player sustains an injury to the lateral surface of the fibula, resulting in weakness in eversion and plantar flexion of the foot. Which muscle is most likely affected?

Accepted Answer

Fibularis (peroneus) longus

Question 9

Which muscle acts to extend the great toe (hallux) and is located between and slightly deep to the tibialis anterior and extensor digitorum longus?

Accepted Answer

Extensor hallucis longus

Question 10

If the adductor magnus is paralyzed, which movement at the hip would be most affected?

Accepted Answer

Adduction of the thigh

Question 11

Which muscle is responsible for both plantar flexion of the foot and flexion of the leg, and has two heads of origin?

Accepted Answer

Gastrocnemius

Question 12

A patient is unable to extend their leg at the knee. Which muscle group is most likely compromised?

Accepted Answer

Quadriceps femoris

Question 13

Which muscle is the most superficial of the anterior thigh and shares its origin at the anterior superior iliac spine?

Accepted Answer

Sartorius

Question 14

Which muscle acts to flex the toes (four lateral) and is located medial and slightly superficial to the tibialis posterior?

Accepted Answer

Flexor digitorum longus

Question 15

During running, which muscle group stabilizes the pelvis and abducts the thigh?

Accepted Answer

Gluteal muscles

Question 16

Which muscle is deep to the gastrocnemius and is a major contributor to plantar flexion of the foot?

Accepted Answer

Soleus

Question 17

A patient presents with inability to medially rotate the leg. Which muscle is most likely affected?

Accepted Answer

Gracilis

Question 18

Which muscle is the deepest and most centrally located in the posterior leg, responsible for plantar flexion and inversion of the foot?

Accepted Answer

Tibialis posterior

Question 19

Which muscle assists in flexion of the leg and runs between the gastrocnemius and soleus?

Accepted Answer

Plantaris

Question 20

If a patient cannot invert their foot, which muscle group is most likely affected?

Accepted Answer

Posterior leg deep muscles (excluding popliteus)

Gross Anatomy of the Muscular System: Muscles of the Lower Limb

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