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Anatomy of Forearm Muscles

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Questions and Answers

What is the common action performed by the pronator teres?

Flexes and adducts the hand at the wrist
Flexes the hand and tenses the palmar aponeurosis
Extends the forearm at the elbow
Pronates the forearm and assists in flexion (correct)

Which nerve is responsible for innervating the flexor carpi radialis?

Musculocutaneous nerve
Radial nerve
Ulnar nerve
Median nerve (correct)

From which specific origin does the palmaris longus muscle arise?

Medial epicondyle of the humerus (correct)
Base of the second metacarpal
Coronoid process of the ulna
Midway along the lateral surface of the radius

What is the insertion point for the flexor carpi radialis?

<p>Base of the second metacarpal (C)</p> Signup and view all the answers

Which of the following muscles assists in flexing the hand and tenses the palmar aponeurosis?

<p>Palmaris longus (B)</p> Signup and view all the answers

Flashcards

Origin

The point where a muscle begins, typically attached to a stable bone.

Insertion

The point where a muscle attaches to the bone that it moves.

Innervation

The nerve supply that stimulates a muscle to contract.

Action

The specific movement produced by muscle contraction.

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Flexor carpi radialis

A muscle that flexes and abducts the wrist, originating from the medial epicondyle of humerus.

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Study Notes

Pronator Teres

Origin: Medial epicondyle of humerus and coronoid process of ulna
Insertion: Midway along lateral surface of radius
Innervation: Median nerve (C6, C7)
Action: Pronates forearm, assists in flexion

Flexor Carpi Radialis

Origin: Medial epicondyle of humerus
Insertion: Base of second metacarpal
Innervation: Median nerve (C6, C7)
Action: Flexes and abducts hand at wrist

Palmaris Longus

Origin: Medial epicondyle of humerus
Insertion: Distal half of flexor retinaculum and palmar aponeurosis
Innervation: Median nerve (C7, C8)
Action: Flexes hand and tenses palmar aponeurosis

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