Question 1

Which muscle is primarily responsible for flexing the thigh at the hip joint and is formed by the union of the psoas major and iliacus muscles?

Accepted Answer

Iliopsoas

Question 2

A patient presents with difficulty extending the knee after a sports injury. Which muscle group is most likely affected?

Accepted Answer

Quadriceps femoris

Question 3

Which muscle is the longest in the human body and acts to flex, abduct, and laterally rotate the thigh at the hip joint?

Accepted Answer

Sartorius

Question 4

The triceps surae is composed of which muscles, and what is their common action?

Accepted Answer

Gastrocnemius and soleus; plantar flexion of the foot

Question 5

Which muscle is NOT part of the hamstring group?

Accepted Answer

Rectus femoris

Question 6

A runner complains of pain along the lateral side of the thigh. Which structure is most likely involved?

Accepted Answer

Iliotibial tract

Question 7

Which muscle is the primary dorsiflexor of the foot at the ankle joint?

Accepted Answer

Tibialis anterior

Question 8

Damage to the deep fibular (peroneal) nerve would most likely result in which clinical finding?

Accepted Answer

Foot drop due to loss of dorsiflexion

Question 9

Which muscle is responsible for abducting the great toe and is found in the first layer of the plantar aspect of the foot?

Accepted Answer

Abductor hallucis

Question 10

A patient is unable to extend their toes at the metatarsophalangeal joints. Which muscle is most likely impaired?

Accepted Answer

Extensor digitorum longus

Question 11

Which muscle acts as a lateral rotator of the thigh and is located deep in the gluteal region?

Accepted Answer

Piriformis

Question 12

Which muscle originates on the fibula and inserts on the first metatarsal and medial cuneiform, acting to evert and plantar flex the foot?

Accepted Answer

Fibularis longus

Question 13

Which muscle is responsible for unlocking the knee joint during the initial phase of knee flexion?

Accepted Answer

Popliteus

Question 14

A ballet dancer presents with weakness in toe flexion and arch support. Which intrinsic foot muscle is most likely affected?

Accepted Answer

Flexor digitorum brevis

Question 15

Which muscle is found in the deep posterior compartment of the leg and is responsible for flexing the great toe?

Accepted Answer

Flexor hallucis longus

Question 16

Which muscle group is primarily responsible for adducting the thigh at the hip joint?

Accepted Answer

Adductor longus, adductor brevis, adductor magnus, gracilis, pectineus

Question 17

Which muscle is the primary extensor of the thigh at the hip joint and is especially active during climbing stairs?

Accepted Answer

Gluteus maximus

Question 18

A patient with a lesion of the superior gluteal nerve would most likely have difficulty with which movement?

Accepted Answer

Abduction of the thigh

Question 19

Which muscle is located on the dorsum of the foot and assists in toe extension?

Accepted Answer

Extensor digitorum brevis

Question 20

Which of the following muscles is NOT part of the quadriceps femoris group?

Accepted Answer

Biceps femoris

Muscles of the Lower Limb: Structure, Function, and Compartmentalization

Study Guide - Practice Questions