Question 1

Which muscle, labeled in the image, is primarily responsible for flexing the knee and extending the thigh, and originates from the ischial tuberosity and inserts on the fibula?

Accepted Answer

Biceps femoris

Question 2

A patient presents with difficulty flexing their knee and extending their thigh after a sports injury. Which muscle, shown in the image, is most likely injured if the insertion is on the tibia and the origin is the ischial tuberosity?

Accepted Answer

Semitendinosus

Question 3

Which of the following muscles, visible in the image, shares both its origin (ischial tuberosity) and its action (flexes knee, extends thigh) with the semitendinosus?

Accepted Answer

Semimembranosus

Question 4

If a nerve injury prevents plantar flexion but knee flexion and thigh extension remain intact, which muscle group in the image is most likely unaffected?

Accepted Answer

Biceps femoris, semitendinosus, semimembranosus

Question 5

Which muscle, labeled in the image, would be most involved in an injury where the fibula is avulsed due to excessive knee flexion?

Accepted Answer

Biceps femoris

Question 6

A patient is unable to extend their thigh but can still dorsiflex their foot. Which muscle, shown in the image, is most likely impaired?

Accepted Answer

Semitendinosus

Question 7

Which muscle, shown in the image, inserts on the tibia and is responsible for both knee flexion and thigh extension?

Accepted Answer

Semimembranosus

Question 8

During a physical exam, you palpate a muscle on the posterior thigh that flexes the knee and extends the thigh. If this muscle is injured, which movement would be most affected?

Accepted Answer

Knee flexion

Question 9

Which muscle, labeled in the image, would be most affected by an injury to the ischial tuberosity?

Accepted Answer

All of the above

Question 10

If a patient has weakness in both knee flexion and thigh extension, which group of muscles, as shown in the image, should be examined for injury?

Accepted Answer

Hamstrings (biceps femoris, semitendinosus, semimembranosus)

Skeletal Muscles: Origins, Insertions, and Actions

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