Fingers Joints Flexion and Extension Quiz

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Questions and Answers

What is the primary action of the flexor digitorum superficialis muscle?

Extends distal interphalangeal joints

Flexes metacarpophalangeal joints

Adducts fingers

Flexes proximal interphalangeal joints (correct)

Which nerve supplies the flexor digitorum superficialis muscle?

Median nerve (correct)

Musculocutaneous nerve

Ulnar nerve

Radial nerve

What is the range of motion for metacarpophalangeal joints flexion?

0 to 180 degrees

0 to 90 degrees (correct)

0 to 45 degrees

0 to 120 degrees

Which of the following muscles primarily flexes the distal interphalangeal joints?

Flexor digitorum profundus Signup and view all the answers

What is the origin of the flexor digitorum superficialis muscle?

Medial epicondyle of humerus Signup and view all the answers

What is the effect of weakness in metacarpo-phalangeal joints flexors?

Difficulty in finger flexion Signup and view all the answers

What is the insertion point for the flexor digitorum superficialis muscle?

Sides of middle phalanges Signup and view all the answers

Which joint actions are tested when examining metacarpo-phalangeal joint extension?

Finger flexion and extension Signup and view all the answers

What is the primary action of the Flexor digitorum profundus muscle?

Flexes the distal interphalangeal joints Signup and view all the answers

Which nerve supplies the medial part of the Flexor digitorum profundus muscle?

Ulnar nerve Signup and view all the answers

What is the range of motion for the proximal interphalangeal joints during flexion?

0° to 120° Signup and view all the answers

Which muscle serves as the primary muscle for flexion at the distal interphalangeal joints?

Flexor digitorum profundus Signup and view all the answers

What is a potential consequence of weakness in the Flexor digitorum profundus muscle?

Claw-Hand deformity Signup and view all the answers

Which muscle is primarily responsible for extending the metacarpophalangeal joints?

Extensor digitorum communis Signup and view all the answers

What is the range of motion for distal interphalangeal joints during flexion?

0° to 80° Signup and view all the answers

Where does the Extensor digiti minimi muscle insert?

Extensor expansion of little finger Signup and view all the answers

Study Notes

Fingers Joints Flexion and Extension

Objectives: Students will learn about the origin, insertion, nerve supply, and action of the primary muscles involved in metacarpo-phalangeal, proximal interphalangeal, and distal interphalangeal joint flexion and extension. They will also identify the range of motion and test procedures for each. Additionally, they will understand the effects of muscle weakness.

Metacarpo-phalangeal Joints Flexion Motion

Primary Muscles: Flexor digitorum superficialis and Flexor digitorum profundus
Range of Motion: 0° to 90° flexion, accompanied by interphalangeal joint extension.
Anatomy of Flexor digitorum superficialis: Originates from the medial epicondyle of the humerus, medial ligament of the elbow, and medial border of the coronoid process and fibrous arch. Insertion is on the sides of the middle phalanges of the medial four fingers. Innervated by the median nerve. Primary action is flexing proximal interphalangeal joints and aiding in wrist flexion
Anatomy of Flexor digitorum profundus: Originates from the medial olecranon and anterior/medial surface of the ulna. Insertion is on the distal phalanges of the medial four fingers. Innervations vary across the muscle; median for some parts, ulnar for others. The primary action is distal interphalangeal joint flexion.
Effects of Weakness: Weakness in these muscles can lead to claw hand deformity.

Proximal Interphalangeal Joints Flexion Motion

Primary Muscles: Flexor digitorum superficialis
Accessory Muscle: Flexor digitorum profundus
Range of Motion: 0° to 120°

Distal Interphalangeal Joints Flexion Motion

Primary Muscle: Flexor digitorum profundus
Range of Motion: 0° to 80°

Metacarpo-phalangeal Joints Extension Motion

Primary Muscles: Extensor digitorum communis, Extensor indicis proprius, Extensor digiti minimi
Range of Motion: 0° to 20°-30°
Anatomy of Extensor digitorum communis: Originates from the lateral epicondyle of the humerus, via a common tendon. Insertion in the extensor expansion of the middle and distal phalanges of digits 2-5. Innervated by the radial nerve. Its action extends the metacarpophalangeal joints, proximal and distal interphalangeal joints, and has a supporting action on wrist and elbow extension.
Anatomy of Extensor indicis proprius: Originates from the posterior distal third of the ulna and interosseous membrane, projects into the dorsal aponeurosis of the index finger. Innervated by radial nerve. Action is extending the index finger and aiding in wrist extension
Anatomy of Extensor digiti minimi: Originates from the common extensor origin on the anterior aspect of the humerus' lateral epicondyle. Insertion: Extensor expansion of the little finger. Innervation: Radial Nerve. Action extends all joints of the little finger.

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Description

This quiz covers the anatomy and physiology of finger joint flexion and extension, focusing on the metacarpo-phalangeal and interphalangeal joints. Students will explore the primary muscles involved, their range of motion, and how muscle weakness affects joint movement. Test your knowledge of muscle origins, insertions, and nerve supplies.