Upper Extremity Muscles Anatomy Quiz

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Questions and Answers

Which muscle forms the characteristic relief of the shoulder?

Trapezius muscle

Deltoid muscle (correct)

Pectoralis major muscle

Latissimus dorsi muscle

Which part of the deltoid muscle allows abduction of the arm from 15° to 90°?

Pars transversa

Pars acromialis (correct)

Pars spinalis

Pars clavicularis

In axillary nerve palsy, which movement of the arm is impaired due to deltoid muscle atrophy?

Abduction (correct)

Adduction

Extension

Flexion

Which nerve stimulates the deltoid muscle?

Axillary nerve Signup and view all the answers

Which muscle works together with the pars spinalis of the deltoid muscle to allow external rotation and extension of the arm?

Latissimus dorsi muscle Signup and view all the answers

Which part of the deltoid muscle allows the upper limbs to swing forward (flexion) and backward (extension) during walking?

Deltoied Signup and view all the answers

Which muscle prevents the humerus from sliding down, especially when carrying weights in the hand?

Deltoid muscle Signup and view all the answers

Which muscle holds the humeral head in the glenoid cavity during arm movements?

Deltoid muscle Signup and view all the answers

Which muscle allows adduction of the arm?

Pectoralis major muscle Signup and view all the answers

Which muscle assists in pronation of the forearm?

Pronator teres Signup and view all the answers

Which muscle allows flexion and abduction (radial deviation) of the hand?

Flexor carpi radialis Signup and view all the answers

Which muscle causes flexion and adduction (ulnar deviation) of the hand?

Flexor carpi ulnaris Signup and view all the answers

Which muscle is located deep to the superficial flexor muscles of the forearm?

Flexor digitorum superficialis Signup and view all the answers

Which muscle mainly flexes the middle phalanges of the 2nd-5th fingers?

Flexor digitorum superficialis Signup and view all the answers

Which muscle is the only forearm muscle whose tendon inserts into the aponeurosis palmaris?

Palmaris longus Signup and view all the answers

Which muscle starts from the medial epicondyle and the medial edge of the olecranon and the ulna?

Flexor carpi ulnaris Signup and view all the answers

Which muscle starts from the anterior face of the radius and the medial side of the medial epicondyle and processus coronoideus?

Flexor carpi radialis Signup and view all the answers

Which muscle allows fast and strong flexion of the 2nd-5th fingers?

Flexor digitorum superficialis Signup and view all the answers

Which muscle is responsible for turning the radius inward (pronation)?

Pronator teres Signup and view all the answers

Which muscle allows adduction, internal rotation, and extension of the arm?

Teres major Signup and view all the answers

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

All of them Signup and view all the answers

Which muscle is the main muscle for internal rotation of the arm?

Subscapularis Signup and view all the answers

Which muscle is a powerful supinator and flexor of the forearm?

Biceps brachii Signup and view all the answers

Which muscle allows external rotation of the arm?

Infraspinatus Signup and view all the answers

Which muscle initiates the first 15° of arm abduction and has no function in rotatory movements?

Supraspinatus Signup and view all the answers

Which muscle is the main extensor muscle of the forearm?

Triceps brachii Signup and view all the answers

Which muscle starts on the dorsal aspect of the lateral edge of the scapula, close to the angulus inferior?

Teres major Signup and view all the answers

Which muscle is fused with the shoulder joint capsule and plays a crucial role in holding the humeral head in place?

Rotator cuff muscles Signup and view all the answers

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

Teres major Signup and view all the answers

Which muscle forms the characteristic relief of the shoulder?

Deltoid Signup and view all the answers

Which muscle is the main abductor muscle of the arm?

Supraspinatus muscle Signup and view all the answers

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

Pars clavicularis Signup and view all the answers

In axillary nerve palsy, what characteristic change occurs in the shoulder due to muscle atrophy?

Characteristic bulge of the shoulder disappears Signup and view all the answers

Which muscle holds the humeral head in the glenoid cavity during arm movements?

Deltoid muscle Signup and view all the answers

Which muscle is responsible for turning the radius inward (pronation)?

Pronator teres muscle Signup and view all the answers

Which muscle prevents the humerus from sliding down, especially when carrying weights in the hand?

Deltoid muscle Signup and view all the answers

Which muscle allows fast and strong flexion of the 2nd-5th fingers?

Flexor digitorum superficialis muscle Signup and view all the answers

Which muscle is the main extensor muscle of the forearm?

Extensor carpi radialis longus muscle Signup and view all the answers

Which muscle is responsible for turning the radius inward (pronation)?

Pronator teres muscle Signup and view all the answers

Which muscle allows fast and strong flexion of the 2nd-5th fingers?

Flexor digitorum superficialis muscle Signup and view all the answers

Which muscle mainly flexes the middle phalanges of the 2nd-5th fingers?

Flexor digitorum superficialis muscle Signup and view all the answers

Which muscle allows flexion and abduction (radial deviation) of the hand?

Flexor carpi radialis muscle Signup and view all the answers

Which muscle causes flexion and adduction (ulnar deviation) of the hand?

Flexor carpi ulnaris muscle Signup and view all the answers

Which muscle is the only forearm muscle whose tendon inserts into the aponeurosis palmaris?

Palmaris longus muscle Signup and view all the answers

Which muscle allows adduction, internal rotation, and extension of the arm?

Subscapularis muscle Signup and view all the answers

Which muscle is a powerful supinator and flexor of the forearm?

Biceps brachii muscle Signup and view all the answers

Which muscle starts on the dorsal aspect of the lateral edge of the scapula, close to the angulus inferior?

Teres major muscle Signup and view all the answers

Which muscle works together with the pars spinalis of the deltoid muscle to allow external rotation and extension of the arm?

Infraspinatus muscle Signup and view all the answers

Which muscle assists in pronation of the forearm?

Brachioradialis Signup and view all the answers

Which muscle is located deep to the superficial flexor muscles of the forearm?

Flexor digitorum profundus Signup and view all the answers

Which muscle mainly flexes the middle phalanges of the 2nd-5th fingers?

Flexor digitorum superficialis Signup and view all the answers

Which muscle starts from the anterior face of the radius and the medial side of the medial epicondyle and processus coronoideus?

Pronator teres Signup and view all the answers

Which muscle is the only forearm muscle whose tendon inserts into the aponeurosis palmaris?

Palmaris longus Signup and view all the answers

Which muscle allows fast and strong flexion of the 2nd-5th fingers?

Flexor digitorum superficialis Signup and view all the answers

Which muscle allows flexion and abduction (radial deviation) of the hand?

Flexor carpi radialis Signup and view all the answers

Which muscle causes flexion and adduction (ulnar deviation) of the hand?

Flexor carpi ulnaris Signup and view all the answers

Which muscle holds the humeral head in the glenoid cavity during arm movements?

Supraspinatus Signup and view all the answers

In axillary nerve palsy, which movement of the arm is impaired due to deltoid muscle atrophy?

Abduction Signup and view all the answers

Which muscle forms the characteristic relief of the shoulder?

Deltoid muscle Signup and view all the answers

In axillary nerve palsy, what characteristic change occurs in the shoulder due to muscle atrophy?

Impaired abduction movement of the arm Signup and view all the answers

Which muscle is stimulated by the axillary nerve?

Deltoid muscle Signup and view all the answers

Which muscle holds the humeral head in the glenoid cavity during arm movements?

Deltoid muscle Signup and view all the answers

Which muscle allows abduction of the arm from 15° to 90°?

Deltoid muscle Signup and view all the answers

Which muscle is fused with the shoulder joint capsule and plays a crucial role in holding the humeral head in place?

Deltoid muscle Signup and view all the answers

Which muscle prevents the humerus from sliding down, especially when carrying weights in the hand?

Deltoid muscle Signup and view all the answers

Which muscle is the main abductor muscle of the arm?

Deltoid muscle Signup and view all the answers

Which muscle is responsible for turning the radius inward (pronation)?

Pronator teres Signup and view all the answers

Which muscle is a powerful supinator and flexor of the forearm?

Brachioradialis Signup and view all the answers

Which muscle is responsible for turning the radius inward (pronation)?

Pronator teres muscle Signup and view all the answers

Which muscle is responsible for adduction, internal rotation, and extension of the arm?

Teres major muscle Signup and view all the answers

Which muscle is the main abductor muscle of the arm?

Deltoid muscle Signup and view all the answers

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

Teres major muscle Signup and view all the answers

Which muscle allows flexion and abduction (radial deviation) of the hand?

Flexor carpi radialis muscle Signup and view all the answers

Which muscle initiates the first 15° of arm abduction and has no function in rotatory movements?

Supraspinatus muscle Signup and view all the answers

Which muscle forms the characteristic relief of the shoulder?

Deltoid muscle Signup and view all the answers

Which muscle is the main muscle for internal rotation of the arm?

Subscapularis muscle Signup and view all the answers

Which muscle mainly flexes the middle phalanges of the 2nd-5th fingers?

Flexor digitorum superficialis muscle Signup and view all the answers

Which muscle is a powerful supinator and flexor of the forearm, originating from the processus coracoideus and the tuberculum supraglenoidale?

Biceps brachii muscle Signup and view all the answers

Which muscle prevents the humerus from sliding down, especially when carrying weights in the hand?

Serratus anterior muscle Signup and view all the answers

Which muscle, with its three heads, is the main extensor muscle of the forearm?

Triceps brachii muscle Signup and view all the answers

Which muscle allows fast and strong flexion of the 2nd-5th fingers?

Flexor digitorum superficialis muscle Signup and view all the answers

Which muscle allows external rotation of the arm?

Infraspinatus muscle Signup and view all the answers

Which muscle works together with the deltoid muscle to allow external rotation and extension of the arm?

Infraspinatus muscle Signup and view all the answers

Which muscle is the main muscle for external rotation of the arm?

Infraspinatus muscle Signup and view all the answers

Which muscle is fused with the shoulder joint capsule and plays a crucial role in holding the humeral head in place?

Serratus anterior muscle Signup and view all the answers

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

Teres major muscle Signup and view all the answers

Which muscle allows adduction, internal rotation, and extension of the arm?

Latissimus dorsi muscle Signup and view all the answers

Which muscle is responsible for holding the humeral head in place during arm movements?

Rotator cuff muscles Signup and view all the answers

Study Notes

Upper Extremity Muscles Anatomy

The teres major muscle functions in all arm movements except adduction.
It starts on the dorsal aspect of the lateral edge of the scapula, close to the angulus inferior, and inserts into the crista tuberculi minoris on the humerus.
It allows adduction, internal rotation, and extension of the arm, similar to the latissimus dorsi muscle.
It, together with the latissimus dorsi muscle, forms the posterior wall of the axillary fossa.
The rotator cuff is a group of tendons fused with the shoulder joint capsule and plays a crucial role in holding the humeral head in place.
The rotator cuff muscles are supraspinatus, infraspinatus, teres minor, and subscapularis.
Supraspinatus muscle initiates the first 15° of arm abduction and has no function in rotatory movements.
Infraspinatus muscle allows external rotation of the arm.
Teres minor muscle also allows external rotation of the arm.
Subscapularis muscle is the main muscle for internal rotation of the arm.
Biceps brachii muscle is a powerful supinator and flexor of the forearm, originating from the processus coracoideus and the tuberculum supraglenoidale.
Triceps brachii muscle, with its three heads, is the main extensor muscle of the forearm.

Upper Extremity Muscles Anatomy

The teres major muscle functions in all arm movements except adduction.
It starts on the dorsal aspect of the lateral edge of the scapula, close to the angulus inferior, and inserts into the crista tuberculi minoris on the humerus.
It allows adduction, internal rotation, and extension of the arm, similar to the latissimus dorsi muscle.
It, together with the latissimus dorsi muscle, forms the posterior wall of the axillary fossa.
The rotator cuff is a group of tendons fused with the shoulder joint capsule and plays a crucial role in holding the humeral head in place.
The rotator cuff muscles are supraspinatus, infraspinatus, teres minor, and subscapularis.
Supraspinatus muscle initiates the first 15° of arm abduction and has no function in rotatory movements.
Infraspinatus muscle allows external rotation of the arm.
Teres minor muscle also allows external rotation of the arm.
Subscapularis muscle is the main muscle for internal rotation of the arm.
Biceps brachii muscle is a powerful supinator and flexor of the forearm, originating from the processus coracoideus and the tuberculum supraglenoidale.
Triceps brachii muscle, with its three heads, is the main extensor muscle of the forearm.

Upper Extremity Muscles Anatomy

The teres major muscle functions in all arm movements except adduction.
It starts on the dorsal aspect of the lateral edge of the scapula, close to the angulus inferior, and inserts into the crista tuberculi minoris on the humerus.
It allows adduction, internal rotation, and extension of the arm, similar to the latissimus dorsi muscle.
It, together with the latissimus dorsi muscle, forms the posterior wall of the axillary fossa.
The rotator cuff is a group of tendons fused with the shoulder joint capsule and plays a crucial role in holding the humeral head in place.
The rotator cuff muscles are supraspinatus, infraspinatus, teres minor, and subscapularis.
Supraspinatus muscle initiates the first 15° of arm abduction and has no function in rotatory movements.
Infraspinatus muscle allows external rotation of the arm.
Teres minor muscle also allows external rotation of the arm.
Subscapularis muscle is the main muscle for internal rotation of the arm.
Biceps brachii muscle is a powerful supinator and flexor of the forearm, originating from the processus coracoideus and the tuberculum supraglenoidale.
Triceps brachii muscle, with its three heads, is the main extensor muscle of the forearm.

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Description

Test your knowledge of upper extremity muscles anatomy with this quiz. Identify muscles, their functions, and origins, and understand the role of the rotator cuff in shoulder stability.