Podcast
Questions and Answers
What is the primary action of the flexor carpi ulnaris?
What is the primary action of the flexor carpi ulnaris?
Which muscle is located in the intermediate compartment of the anterior forearm?
Which muscle is located in the intermediate compartment of the anterior forearm?
What is the innervation of the pronator teres?
What is the innervation of the pronator teres?
Which muscle is absent in approximately 15% of the population?
Which muscle is absent in approximately 15% of the population?
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From which part of the humerus do the muscles of the superficial compartment originate?
From which part of the humerus do the muscles of the superficial compartment originate?
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Which of the following muscles is primarily responsible for wrist flexion?
Which of the following muscles is primarily responsible for wrist flexion?
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What joint action does the pronator teres perform?
What joint action does the pronator teres perform?
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Which muscle attaches to the flexor retinaculum of the wrist?
Which muscle attaches to the flexor retinaculum of the wrist?
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Which muscle is primarily responsible for flexing the distal interphalangeal joints of the fingers?
Which muscle is primarily responsible for flexing the distal interphalangeal joints of the fingers?
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What is the innervation of the medial half of the flexor digitorum profundus?
What is the innervation of the medial half of the flexor digitorum profundus?
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What joints does the flexor digitorum superficialis act upon?
What joints does the flexor digitorum superficialis act upon?
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Which muscle originates from the anterior surface of the radius?
Which muscle originates from the anterior surface of the radius?
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Which function is primarily associated with the pronator quadratus?
Which function is primarily associated with the pronator quadratus?
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How are the muscles of the posterior compartment of the forearm primarily classified?
How are the muscles of the posterior compartment of the forearm primarily classified?
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Which nerve is responsible for innervating all muscles in the posterior compartment of the forearm?
Which nerve is responsible for innervating all muscles in the posterior compartment of the forearm?
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What structure does the flexor digitorum superficialis split into at the wrist?
What structure does the flexor digitorum superficialis split into at the wrist?
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What is the main action of the anconeus muscle?
What is the main action of the anconeus muscle?
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Which muscle originates from the lateral epicondyle of the humerus and is responsible for wrist adduction?
Which muscle originates from the lateral epicondyle of the humerus and is responsible for wrist adduction?
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Where does the supinator muscle insert?
Where does the supinator muscle insert?
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Which of the following muscles does NOT act on the thumb?
Which of the following muscles does NOT act on the thumb?
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What is the action of the abductor pollicis longus muscle?
What is the action of the abductor pollicis longus muscle?
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Which two structures does the deep branch of the radial nerve pass between in the supinator muscle?
Which two structures does the deep branch of the radial nerve pass between in the supinator muscle?
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What anatomical feature does the tendon of the extensor pollicis brevis contribute to?
What anatomical feature does the tendon of the extensor pollicis brevis contribute to?
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Which muscle acts to abduct the ulna during pronation of the forearm?
Which muscle acts to abduct the ulna during pronation of the forearm?
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Which muscle is responsible for flexing at the elbow?
Which muscle is responsible for flexing at the elbow?
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Which muscles share a common tendinous origin at the lateral epicondyle?
Which muscles share a common tendinous origin at the lateral epicondyle?
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What is the primary action of the Extensor Digitorum Communis?
What is the primary action of the Extensor Digitorum Communis?
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What is the anatomical position of the Extensor Carpi Ulnaris?
What is the anatomical position of the Extensor Carpi Ulnaris?
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Which muscle extends the little finger?
Which muscle extends the little finger?
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From where does the Extensor Carpi Radialis Longus originate?
From where does the Extensor Carpi Radialis Longus originate?
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What action can the Extensor Carpi Radialis Longus and Brevis perform at the wrist?
What action can the Extensor Carpi Radialis Longus and Brevis perform at the wrist?
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What happens to the Extensor Digitorum tendon at the distal part of the forearm?
What happens to the Extensor Digitorum tendon at the distal part of the forearm?
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Study Notes
Forearm Muscles and Innervation
- The muscles of the forearm are organized into anterior and posterior compartments.
- The anterior compartment muscles are responsible for flexion.
- The posterior compartment muscles are responsible for extension.
Terms of Movement
- Flexion: Decreases the angle between two body parts.
- Extension: Increases the angle between two body parts.
- Abduction: Moving a body part away from the midline of the body.
- Adduction: Moving a body part toward the midline of the body.
- Pronation: Turning the palm downward.
- Supination: Turning the palm upward.
Muscles of the Anterior Forearm Compartment
-
A- Superficial Compartment:
- Flexor carpi ulnaris
- Palmaris longus
- Flexor carpi radialis
- Pronator teres
-
B- Intermediate Compartment:
- Flexor digitorum superficialis
-
C- Deep Compartment:
- Flexor pollicis longus
- Flexor digitorum profundus
- Pronator quadratus
Muscles of the Posterior Forearm Compartment
-
A- Superficial Muscles:
- Brachioradialis
- Extensor carpi radialis longus and brevis
- Extensor digitorum
- Extensor digiti minimus
- Extensor carpi ulnaris
- Anconeus
-
B- Deep Muscles:
- Supinator
- Abductor pollicis longus
- Extensor pollicis brevis
- Extensor pollicis longus
- Extensor indicis
Specific Muscle Details: (Examples)
- Flexor Carpi Ulnaris: Two origins (humeral and ulnar). Involved in wrist flexion and adduction.
- Palmaris Longus: Often absent in a portion of the population. Involved in wrist flexion.
- Flexor Digitorum Profundus: The only muscle that flexes distal interphalangeal joints. Innervated by both median and ulnar nerves.
- Pronator Teres: Involved in pronation of the forearm.
- Brachioradialis: Flexes the elbow joint and contributes to supination.
- Extensor Carpi Radialis Longus and Brevis: Extends and abducts the wrist.
- Extensor Digitorum: The primary extensor of the fingers.
- Extensor Digiti Minimi: Extends the little finger.
- Extensor Carpi Ulnaris: Extends and adducts the wrist.
- Anconeus: Extends and stabilizes the elbow joint.
Nerve Supply
- Many of the forearm muscles are innervated by the median nerve.
- Some are innervated by the ulnar nerve.
- Others are innervated by the radial nerve,.
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Description
Test your knowledge on the muscles of the forearm with this quiz. Topics include innervation, actions, and anatomical locations of various muscles in the anterior and posterior compartments. Perfect for students of anatomy and health sciences.
