Forearm and Hand Muscles

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Questions and Answers

What is the main function of the deltoid muscle?

Abduction of the arm (correct)

Adduction of the arm

Internal rotation of the arm

External rotation of the arm

Which part of the deltoid muscle allows flexion and internal rotation of the arm?

Pars clavicularis (correct)

Pars acromialis

Pars spinalis

None of the above

What happens in axillary nerve palsy with respect to the deltoid muscle?

Characteristic bulge of the shoulder disappears due to muscle atrophy (correct)

Adduction movement of the arm is impaired

Skin sensation is lost in the upper part of the outer surface of the arm

All of the above

What is the role of the deltoid muscle during walking?

Allows the upper limbs to swing forward (flexion) and backward (extension) Signup and view all the answers

Which nerve stimulates the first and second lumbrical muscles?

N. medianus Signup and view all the answers

What is the function of the lumbrical muscles?

Flexion of the proximal phalanges at the metacarpophalangeal joints and extension of the other phalanges at the interphalangeal joints Signup and view all the answers

Where do the palmar interosseous muscles originate?

From the bodies of the metacarpal bones Signup and view all the answers

What is the function of the dorsal interosseous muscles?

Abduct the fingers Signup and view all the answers

Which muscle initiates the first 15° of arm abduction?

Supraspinatus Signup and view all the answers

Which muscle is involved in arm adduction and internal rotation?

Teres major Signup and view all the answers

Which muscle forms the posterior wall of the axillary fossa along with latissimus dorsi?

Teres major Signup and view all the answers

Which muscle is the primary extensor of the forearm?

Triceps brachii Signup and view all the answers

Which muscle is responsible for forearm pronation?

Pronator teres Signup and view all the answers

Which muscle facilitates hand flexion and stretches the aponeurosis?

Palmaris longus Signup and view all the answers

Which muscle is the main pronator muscle and holds the ulna and radius together?

Pronator quadratus Signup and view all the answers

Which muscle is the largest forearm muscle, flexing the distal phalanges of the fingers?

Flexor digitorum profundus Signup and view all the answers

Which nerve is responsible for stimulating the tenar muscles for thumb movements?

Median nerve Signup and view all the answers

What condition is caused by compression of the median nerve in the carpal tunnel?

Carpal tunnel syndrome Signup and view all the answers

Which group of muscles are stimulated by the ulnar nerve to make little finger movements?

Hypothenar muscles Signup and view all the answers

What causes pain on the medial side of the elbow due to inflammation?

Inflammation of the medial epicondyle Signup and view all the answers

Study Notes

Anatomy and Function of Forearm and Hand Muscles

Continuous and forceful movements can lead to inflammation of the medial epicondyle, causing pain on the medial side of the elbow
Deep muscles of the forearm include abductor pollicis longus, extensor pollicis longus, and extensor pollicis brevis, each with specific origins, insertions, and functions related to thumb movement
Superficial muscles on the back of the forearm, such as extensor digitorum, extensor digiti minimi, and extensor carpi ulnaris, have specific origins and functions related to finger and hand extension and movement
Extensor muscles like anconeus, extensor indicis, and supinator also have distinct origins and functions related to forearm and hand movement
Lateral epicondylitis (tennis elbow) is caused by repetitive use of extensor muscles or vigorous supination-pronation movements, leading to inflammation and pain in the lateral epicondyle and the posterior aspect of the forearm
Carpal tunnel syndrome is an entrapment neuropathy caused by compression of the median nerve in the carpal tunnel, resulting in burning or pinprick pain on the palmar aspect of the hand and weakening of tenar muscle function
Tenar muscles, including abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, and opponens pollicis, form the tenar ridge and are stimulated by the median nerve to make thumb movements
Hypothenar muscles, including abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi, are stimulated by the ulnar nerve to make little finger movements
Both tenar and hypothenar muscles have specific functions related to thumb and little finger movements
The anatomy and function of the forearm and hand muscles play a crucial role in various activities and can be affected by conditions like lateral epicondylitis and carpal tunnel syndrome
Detailed information about the origins, insertions, and functions of specific muscles in the forearm and hand provides insight into their role in movement and potential for injury or dysfunction
Understanding the complex interplay of these muscles and their innervation is essential for diagnosing and treating conditions affecting the forearm and hand muscles

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Description

Test your knowledge of the anatomy and function of forearm and hand muscles with this quiz. Explore the origins, insertions, and specific functions of deep and superficial muscles, as well as conditions like lateral epicondylitis and carpal tunnel syndrome. Gain insight into the intricate interplay of these muscles and their role in movement, injury, and dysfunction.