Question 1

Which muscle, as shown 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

If a patient cannot flex their knee after a sports injury, which muscle labeled in the image is most likely damaged?

Accepted Answer

Biceps femoris

Question 3

Which of the following best describes the insertion point of the semitendinosus muscle as labeled in the image?

Accepted Answer

Tibia

Question 4

A patient presents with weakness in extending the thigh. Which muscle from the image is most likely involved?

Accepted Answer

Semimembranosus

Question 5

Which muscle in the image is NOT part of the quadriceps femoris group?

Accepted Answer

Biceps femoris

Question 6

What is the common origin for all three muscles labeled in the image?

Accepted Answer

Ischial tuberosity

Question 7

Which action would be impaired if the semimembranosus muscle was injured?

Accepted Answer

Flexion of the knee

Question 8

A runner complains of pain in the posterior thigh and difficulty extending the hip. Which muscle is most likely strained?

Accepted Answer

Biceps femoris

Question 9

Which muscle labeled in the image is also involved in medial rotation of the leg when the knee is flexed?

Accepted Answer

Semitendinosus

Question 10

If the sciatic nerve is damaged, which group of muscles shown in the image would most likely be affected?

Accepted Answer

Hamstrings (biceps femoris, semitendinosus, semimembranosus)

Skeletal Muscles: Origins, Insertions, and Actions

Study Guide - Practice Questions