Forearm Anatomy Quiz - Anatomy 2024/2025

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Questions and Answers

What is the primary nerve supply for the flexor pollicis longus muscle?

Musculocutaneous nerve

Radial nerve

Median nerve (correct)

Ulnar nerve

Which ligament connects the pisiform bone to the hamate?

Piso-hamate ligament (correct)

Piso-median ligament

Hamate-phalangeal ligament

Piso-carapal ligament

What action does the flexor carpi ulnaris perform when acting alone?

Only adduction of the hand

Flexion and adduction of the hand (correct)

Extension of the wrist

Flexion with abduction of the hand

Which of the following muscles is NOT part of the deep layer of forearm muscles?

Palmaris longus Signup and view all the answers

Where does the flexor digitorum superficialis originate from?

Medial epicondyle of the humerus Signup and view all the answers

Which tendons are arranged superficially in the carpal tunnel?

Tendons of the middle and ring fingers Signup and view all the answers

What is the main action of the flexor digitorum superficialis?

Flexion of the middle and proximal phalanges Signup and view all the answers

Which muscle lies just medial to the pronator teres?

Flexor carpi radialis Signup and view all the answers

What is the primary action of the pronator teres?

Pronation of the forearm Signup and view all the answers

Which muscle is absent in some individuals?

Palmaris longus Signup and view all the answers

What nerve supplies the flexor carpi ulnaris muscle?

Ulnar nerve Signup and view all the answers

Which of the following muscles is the deepest layer of the flexor group in the anterior compartment of the forearm?

Flexor digitorum profundus Signup and view all the answers

Which muscle has its origin from the medial side of the coronoid process of the ulna?

Pronator teres Signup and view all the answers

Which muscle inserts into the pisiform bone?

Flexor carpi ulnaris Signup and view all the answers

What is the insertion point of the flexor carpi radialis?

Palmar surface of the bases of the 2nd and 3rd metacarpal bones Signup and view all the answers

What is the primary action of the flexor pollicis longus?

Flexion of all joints of the thumb Signup and view all the answers

Which nerve supplies the flexor digitorum profundus?

Anterior interosseous branch of the median nerve Signup and view all the answers

Where does the flexor digitorum profundus insert?

Base of the distal phalanx of the medial four fingers Signup and view all the answers

Which of the following actions does the pronator quadratus perform?

Pronation of the forearm Signup and view all the answers

What structure does the tendon of the flexor pollicis longus pass under?

Flexor retinaculum Signup and view all the answers

What is a primary relation of the flexor digitorum profundus?

Ulnar artery passes along its medial aspect Signup and view all the answers

What is the origin of the pronator quadratus?

Lower 1/4 of the anterior surface of the ulna Signup and view all the answers

Each tendon of the flexor digitorum profundus attaches to the base of the terminal phalanx via what structure?

Vascular fibrous bands called vincula Signup and view all the answers

Study Notes

Forearm Anatomy

MSK(101-1) Academic year: 2024/2025
Department: Anatomy
Lecturer: Prof. Dr. Hayam Elsaady, Farhoud

Forearm Compartments

The forearm has anterior (flexor) and posterior (extensor) compartments.
These compartments are separated by intermuscular septa.
The anterior compartment contains muscles that flex the wrist and fingers.
The posterior compartment contains muscles that extend the wrist and fingers.

Anterior Compartment Muscles (Superficial Layer)

Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor digitorum superficialis
Flexor carpi ulnaris
Flexor digitorum superficialis lies deeper than the other muscles in the superficial layer.

Anterior Compartment Muscles( Deep Layer)

Flexor pollicis longus
Flexor digitorum profundus
Pronator quadratus

Pronator Teres

Origin: medial epicondyle and medial supracondylar ridge of humerus; medial side of cornoid process of ulna
Insertion: middle of lateral surface of radius
Nerve supply: Median nerve
Action: pronation of the forearm

Flexor Carpi Radialis

Origin: medial epicondyle of humerus
Insertion: base of the 2nd and 3rd metacarpal bones
Nerve supply: Median nerve
Action: wrist flexion and abduction

Palmaris Longus

Origin: medial epicondyle of humerus
Insertion: palmar aponeurosis
Nerve supply: Median nerve
Action: wrist flexion

Flexor Carpi Ulnaris

Origin: medial epicondyle of humerus and medial margin of olecranon & posterior border of ulna
Insertion: pisiform and hamate bones, base of 5th metacarpal
Nerve supply: ulnar nerve
Action: wrist flexion and adduction

Flexor Digitorum Superficialis

Origin: medial epicondyle (common flexor origin), medial side of coronoid process, oblique upper 1/3 of anterior border of radius
Insertion: middle phalanges of medial four fingers
Nerve supply: median nerve
Action: flexion of the middle and proximal phalanges, assists wrist flexion

Flexor Digitorum Profundus

Origin: anterior surface of medial ulna, and interosseous membrane.
Insertion: distal phalanges of medial four fingers
Nerve supply: anterior interosseous branch of median nerve
Action: flexion of distal joints of medial four fingers

Flexor Pollicis Longus

Origin: upper 2/3 of anterior surface of radius
Insertion: distal phalanx of thumb
Nerve supply: anterior interosseous branch of median nerve
Action: flexion of all joints of the thumb

Pronator Quadratus

Origin: distal ¼ of anterior surface of ulna
Insertion: distal ¼ of anterior surface of radius
Nerve supply: anterior interosseous branch of median nerve
Action: pronation of forearm, helps bind radius to ulna

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Description

Test your knowledge on the anatomy of the forearm, focusing on its compartments and the muscles within them. This quiz covers both the superficial and deep layers of the anterior compartment as well as key muscles like the pronator teres. Perfect for students in the Anatomy department.