Question 1

Which muscle, labeled in the image, originates from the ischial tuberosity and inserts on the fibula, and what is its primary action?

Accepted Answer

Biceps femoris; flexes the knee and extends the thigh

Question 2

A patient presents with difficulty flexing their knee after a sports injury. Which muscle, shown in the image, is most likely injured if the pain is localized to the medial aspect of the posterior thigh?

Accepted Answer

Semitendinosus

Question 3

Which of the following best describes the insertion point of the semimembranosus muscle as shown in the image?

Accepted Answer

Tibia

Question 4

If the sciatic nerve is damaged, which action performed by the muscles labeled in the image would most likely be impaired?

Accepted Answer

Knee flexion

Question 5

Which muscle in the image is most lateral and what is its primary function?

Accepted Answer

Biceps femoris; flexes the knee

Question 6

A runner complains of pain at the ischial tuberosity after sprinting. Which muscle, shown in the image, is most likely strained?

Accepted Answer

Biceps femoris

Question 7

Which muscle labeled in the image is NOT involved in knee extension?

Accepted Answer

Semimembranosus

Question 8

During a physical exam, a physician asks a patient to flex their knee against resistance. Which muscle, as shown in the image, is being primarily tested?

Accepted Answer

Semitendinosus

Question 9

Which muscle in the image shares its origin with the semitendinosus and semimembranosus?

Accepted Answer

Biceps femoris

Question 10

A patient with a torn biceps femoris would have difficulty performing which of the following movements?

Accepted Answer

Flexing the knee

Skeletal Muscles: Origins, Insertions, and Actions

Study Guide - Practice Questions

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