Question 1

Which muscle is primarily responsible for raising the eyebrows, and what is its origin and insertion?

Accepted Answer

Epicranius frontalis; origin: epicranial aponeurosis, insertion: skin of eyebrows & root of nose

Question 2

A patient is unable to close their jaw after a facial injury. Which muscle is most likely impaired?

Accepted Answer

Masseter

Question 3

Which muscle is responsible for neck flexion and head rotation towards the shoulder, and what are its points of origin and insertion?

Accepted Answer

Sternocleidomastoid; origin: manubrium of sternum & medial portion of clavicle, insertion: mastoid process of temporal bone & superior nuchal line of occipital bone

Question 4

Which muscle arrangement is best suited for producing the greatest range of motion, and which muscle is an example?

Accepted Answer

Fusiform; Biceps brachii

Question 5

A muscle named 'rectus femoris' is classified based on which two criteria?

Accepted Answer

Direction of muscle fiber and location

Question 6

During inhalation, which muscle helps to pull the chest upward and what is its origin?

Accepted Answer

Pectoralis major; origin: clavicle, sternum, cartilage of ribs 1-6, & aponeurosis of external obliques

Question 7

Which muscle is essential for raising the arm above the head and why?

Accepted Answer

Serratus anterior; it fixes the scapula for arm abduction

Question 8

If a person cannot compress their abdomen during exhalation, which muscle is most likely not functioning?

Accepted Answer

Transversus abdominis

Question 9

Which muscle group is responsible for extending the lower leg at the knee, and what is the origin of the rectus femoris?

Accepted Answer

Quadriceps femoris; origin: anterior inferior iliac spine & superior margin of acetabulum

Question 10

A cyclist complains of pain in the lateral thigh after repeated abduction movements. Which muscle is most likely involved?

Accepted Answer

Gluteus medius

Question 11

Which muscle is responsible for plantar flexion of the foot and is composed of two heads originating from the femur?

Accepted Answer

Gastrocnemius

Question 12

A patient presents with difficulty flexing their forearm. Which muscle is NOT likely to be involved?

Accepted Answer

Triceps brachii

Question 13

Which muscle arrangement is found in the extensor digitorum longus and what is its functional advantage?

Accepted Answer

Unipennate; allows for greater force production

Question 14

Which muscle is responsible for adducting, flexing, and medially rotating the thigh, and is part of the medial compartment?

Accepted Answer

Adductor magnus

Question 15

If the origin of a muscle is immobilized by another muscle, what is the name of the immobilizing muscle?

Accepted Answer

Fixator

Question 16

Which muscle is responsible for dorsiflexion and inversion of the foot?

Accepted Answer

Tibialis anterior

Question 17

A patient is unable to extend their fingers and hand at the wrist. Which muscle is most likely affected?

Accepted Answer

Extensor digitorum

Question 18

Which muscle is named for its triangular shape and what is its primary action?

Accepted Answer

Deltoid; abducts arm

Question 19

Which muscle group is responsible for flexing the trunk at the hip and what is its anatomical name?

Accepted Answer

Iliopsoas

Question 20

A patient has difficulty depressing their larynx and hyoid bone. Which muscle is most likely impaired?

Accepted Answer

Sternohyoid

Study Notes: The Muscular System (Anatomy & Physiology Lab I, Lesson 8)

Study Guide - Practice Questions

Study Guide - Flashcards