Question 1

Which muscle is primarily responsible for abduction of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 2

A patient presents with difficulty abducting their arm. Which muscle is most likely injured?

Accepted Answer

Deltoid

Question 3

The biceps brachii originates from the coracoid process and inserts on the radial tuberosity. What is its primary action?

Accepted Answer

Elbow flexion

Question 4

Which muscle inserts on the coronoid process and is involved in lifting the ulna during elbow flexion?

Accepted Answer

Brachialis

Question 5

During elbow flexion, which muscle is responsible for lifting the radius?

Accepted Answer

Brachioradialis

Question 6

A student is asked to identify the muscle that originates from the distal humerus and inserts on the styloid process of the radius. Which muscle should they select?

Accepted Answer

Brachioradialis

Question 7

If the coracoid process is fractured, which muscle's function would most likely be impaired?

Accepted Answer

Biceps Brachii

Question 8

Which muscle is NOT involved in elbow flexion?

Accepted Answer

Deltoid

Question 9

A patient has lost the ability to lift their ulna during elbow flexion. Which muscle is most likely damaged?

Accepted Answer

Brachialis

Question 10

Which muscle originates from the clavicle and acromion process and inserts on the diaphysis of the humerus?

Accepted Answer

Deltoid

Question 11

A baseball pitcher suffers an injury to the radial tuberosity. Which muscle's action would be most affected?

Accepted Answer

Biceps Brachii

Question 12

Which muscle would be most active during the initial phase of lifting a heavy object with a flexed elbow?

Accepted Answer

Brachialis

Question 13

If a person cannot abduct their arm, which muscle is most likely paralyzed?

Accepted Answer

Deltoid

Question 14

Which muscle's insertion is closest to the wrist joint?

Accepted Answer

Brachioradialis

Question 15

A patient with a fractured distal humerus is most likely to have impaired function in which muscle?

Accepted Answer

Brachioradialis

Question 16

Which muscle is involved in both elbow flexion and lifting the radius?

Accepted Answer

Brachioradialis

Question 17

During a biceps curl exercise, which muscle is primarily responsible for flexing the elbow?

Accepted Answer

Biceps Brachii

Question 18

Which muscle would be least affected by an injury to the humerus?

Accepted Answer

Biceps Brachii

Question 19

If the styloid process of the radius is damaged, which muscle's action would be compromised?

Accepted Answer

Brachioradialis

Question 20

Which muscle is most likely to be used when lifting the forearm rapidly during a reflex hammer test?

Accepted Answer

Brachioradialis

Anterior Upper Extremity Muscles: Origins, Insertions, and Actions

Study Guide - Practice Questions

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