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Questions and Answers
Which muscle has an insertion point at the base of the 2nd metacarpal bone?
What is the action of the Pronator Teres muscle?
Which nerve supplies the Flexor Carpi Ulnaris muscle?
What is the origin of the Flexor Digitorum Profundus muscle?
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Which muscle has an action of flexion and radial deviation of the wrist?
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What is the nerve supply of the Flexor Digitorum Superficialis muscle?
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Which muscle has an insertion point at the bases of the distal phalanges of the fingers?
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What is the action of the Flexor Digitorum Superficialis muscle?
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Study Notes
Forearm Muscles
Pronator Teres
- Origin: Medial epicondyle of the humerus
- Insertion: Lateral radius
- Action: Pronation of the forearm
- Nerve supply: Median nerve
Flexor Carpi Radialis
- Origin: Medial epicondyle of the humerus
- Insertion: Base of the 2nd metacarpal bone
- Action: Flexion and radial deviation of the wrist
- Nerve supply: Median nerve
Flexor Carpi Ulnaris
- Origin: Medial epicondyle of the humerus and medial aspect of the ulna
- Insertion: Pisiform bone, hook of the hamate, and base of the 5th metacarpal bone
- Action: Flexion and ulnar deviation of the wrist
- Nerve supply: Ulnar nerve
Flexor Digitorum Profundus
- Origin: Anterior and medial aspects of the ulna and interosseous membrane
- Insertion: Bases of the distal phalanges of the fingers
- Action: Flexion of the fingers
- Nerve supply: Ulnar and anterior interosseous nerves
Flexor Digitorum Superficialis
- Origin: Medial epicondyle of the humerus
- Insertion: Middle phalanges of the fingers
- Action: Flexion of the fingers
- Nerve supply: Median nerve
Palmaris Longus
- Origin: Medial epicondyle of the humerus
- Insertion: Palmar aponeurosis and flexor retinaculum
- Action: Flexion of the wrist and tenses the palmar aponeurosis
- Nerve supply: Median nerve
Flexor Pollicis Longus
- Origin: Anterior aspect of the radius and interosseous membrane
- Insertion: Base of the distal phalanx of the thumb
- Action: Flexion of the thumb
- Nerve supply: Anterior interosseous nerve
Pronator Quadratus
- Origin: Anterior aspect of the ulna
- Insertion: Anterior aspect of the radius
- Action: Pronation of the forearm
- Nerve supply: Anterior interosseous nerve
Forearm Muscles
Muscles Acting on the Forearm
- Pronation of the forearm is performed by Pronator Teres and Pronator Quadratus muscles
Muscles Acting on the Wrist
- Flexion and radial deviation of the wrist is performed by Flexor Carpi Radialis muscle
- Flexion and ulnar deviation of the wrist is performed by Flexor Carpi Ulnaris muscle
- Palmaris Longus muscle flexes the wrist and tenses the palmar aponeurosis
Muscles Acting on the Fingers
- Flexion of the fingers is performed by Flexor Digitorum Profundus and Flexor Digitorum Superficialis muscles
- Flexor Digitorum Profundus muscle inserts into the bases of the distal phalanges of the fingers
- Flexor Digitorum Superficialis muscle inserts into the middle phalanges of the fingers
Muscles Acting on the Thumb
- Flexion of the thumb is performed by Flexor Pollicis Longus muscle
- Flexor Pollicis Longus muscle inserts into the base of the distal phalanx of the thumb
Nerve Supply
- Median nerve supplies Pronator Teres, Flexor Carpi Radialis, Flexor Digitorum Superficialis, and Palmaris Longus muscles
- Ulnar nerve supplies Flexor Carpi Ulnaris muscle
- Anterior interosseous nerve supplies Flexor Digitorum Profundus and Flexor Pollicis Longus muscles
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Description
Learn about the origins, insertions, actions, and nerve supplies of the forearm muscles, including Pronator Teres, Flexor Carpi Radialis, and Flexor Carpi Ulnaris.
