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Please view the main muscle page to learn about foundational information relating to muscles (such as origins, insertions, actions, innervations):
General Information
The muscles of the forearm can be divided into flexors/anterior compartment or extensors/posterior compartment
In general, most flexor muscles originate at the medial epicondyle of the humerus, while most extensor muscles originate at the lateral epicondyle of the humerus
Quiz Questions - please watch the videos and view the Kenhub link before taking
1. Which of the following muscles is a primary wrist flexor and also causes radial deviation?
a. Flexor carpi ulnaris
b. Flexor carpi radialis
c. Palmaris longus
d. Extensor carpi radialis brevis
2. Which forearm muscle inserts into the palmar aponeurosis and is sometimes absent in people?
a. Flexor pollicis longus
b. Flexor carpi ulnaris
c. Palmaris longus
d. Pronator teres
3. Which nerve innervates most of the flexor muscles in the forearm?
a. Ulnar nerve
b. Radial nerve
c. Musculocutaneous nerve
d. Median nerve
4. Which muscle pronates the forearm and lies deep near the wrist?
a. Pronator teres
b. Supinator
c. Brachioradialis
d. Pronator quadratus
5. The common flexor tendon originates from which bony landmark?
a. Lateral epicondyle of the humerus
b. Radial tuberosity
c. Olecranon process
d. Medial epicondyle of the humerus
6. Which muscle flexes the DIP joints of the fingers?
a. Flexor digitorum superficialis
b. Extensor digitorum
c. Flexor digitorum profundus
d. Lumbricals
7. The flexor digitorum superficialis splits into tendons that insert on which phalanges?
a. Distal phalanges
b. Proximal phalanges
c. Middle phalanges
d. Metacarpals
8. Which muscle has tendons that pass through the split tendons of the FDS?
a. Extensor indicis
b. Flexor digitorum profundus
c. Flexor pollicis longus
d. Brachioradialis
9. What is a key difference between FDS and FDP in terms of insertion?
a. FDS inserts on distal phalanges, FDP on middle phalanges
b. FDS inserts on metacarpals, FDP on carpal bones
c. FDS inserts on middle phalanges, FDP on distal phalanges
d. FDS inserts on proximal phalanges, FDP on middle phalanges
10. Where do most flexor muscles of the forearm originate?
A. Lateral epicondyle of the humerus
B. Medial epicondyle of the humerus
C. Radial head
D. Ulnar notch
11. Which of the following muscles is part of the posterior compartment of the forearm?
A. Flexor carpi radialis
B. Extensor carpi ulnaris
C. Flexor digitorum superficialis
D. Palmaris longus
12. Which compartment of the forearm contains the muscles responsible for wrist flexion?
A. Anterior compartment
B. Posterior compartment
C. Lateral compartment
D. Medial compartment
Quiz Answers
B
C
D
D
D
C
C
B
C
B
B
A
References
Images from: Atlas of Anatomy 4th Edition, Gilroy et al., 2020, Thieme Medical Publishers
Information based on lecture content from professor Dr. Earl Mayhew, DPT, BIO 634 - Human Anatomy course, University of Michigan-Flint, Fall 2023