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UE Muscle Actions Flashcards

1
Q

What is the action of the Trapezius muscle?

A

elevates and depresses the shoulder (shrugging)
Retracts the scapula

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2
Q

What is the action of the Latissimus Dorsi muscle?

A

adducts, extends and medially rotates the humerus

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3
Q

What is the action of the Levator Scapulae muscle?

A

elevates the scapula

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4
Q

What is the action of the Rhomboid Major and Minor muscles?

A

retracts the scapula

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5
Q

What is the action of the Serratus Posterior Superior?

A

Elevates the ribs in inspiration

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6
Q

What is the action of the Serratus Posterior Inferior muscle?

A

Depresses the ribs in expiration

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7
Q

What is the action of the Splenius Capitus muscle?

A

Extends the neck and head
Rotate in unilateral direction

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8
Q

What is the action of the Erector Spinae (Iliocostalis, Longissimus, Spinalis) muscles?

A

Extends the trunk and vertebral column

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9
Q

What is the action of the Semi Spinalis muscle?

A

Extends the trunks in bilateral action and rotates the vertebral column in unilateral action

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10
Q

What is the action of the Deltoid muscle?

A

Abduction of shoulder
Helps in flexion, adduction, medial rotation of shoulder

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11
Q

What is the action of the Supraspinatus muscle?

A

Initiates abduction of the shoulder joint to the first 15 degrees

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12
Q

What is the action of the Infraspinatus muscle?

A

Lateral rotation of the shoulder

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13
Q

What is the action of the Teres Minor Muscle?

A

Lateral rotation of the humerus
Abduction of the shoulder

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14
Q

What is the action of the Teres Major muscle?

A

Medial rotation and adduction of the humerus

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15
Q

What is the action of the Subscapularis muscle?

A

Medially rotates the humerus

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16
Q

What is the action of the Triceps Brachii (long head, lateral head, medial head) muscle?

A

Extends the elbow

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17
Q

What is the action of the Anconeus muscle?

A

Assists the triceps in extending the elbow

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18
Q

What is the action of the Brachioradialis muscle?

A

Flexes the elbow joint and acts best in mid-prone position

19
Q

What is the action of the Extensor Carpi Radialis Longus muscle?

A

Extends and abducts the wrist
Radial deviation
Weak elbow flexor

20
Q

What is the action of the Extensor Digitorum muscle?

A

Extends the digits (metacarpophalangeal, proximal, and distal interphalangeal joints)
Helps extend the wrist

21
Q

What is the action of the Extensor Digiti Minimi?

A

Extends the little finger

22
Q

What is the action of the Extensor Carpi Ulnaris?

A

Extends and adducts the wrist

23
Q

What is the action of the Supinator muscle?

A

Acts as a supinator in an extended elbow

24
Q

What is the action of the Abductor Pollicis Longus muscle?

A

Abducts and extends the thumb

25
Q

What is the action of the Extensor Pollicis Brevis muscle?

A

Extends proximal phalanx of the thumb

26
Q

What is the action of the Extensor Pollicis Longus muscle?

A

Extends the distal phalanx of the thumb

27
Q

What is the action of the Extensor Indicis muscle?

A

Extends the index finger

28
Q

What is the action of the Pectoralis Major muscle?

A

Flexion, medial rotation, and adduction of the shoulder

29
Q

What is the action of the Pectoralis Minor muscle?

A

Protracts the scapula along with the serratus anterior

30
Q

What is the action of the serratus anterior muscle?

A

Protracts the scapula

31
Q

What is the action of the Biceps Brachii muscle?

A

Powerful supinator of the forearm and flexor of the elbow

32
Q

What is the action of the Coracobrachialis muscle?

A

Weak flexor of the shoulder

33
Q

What is the action of the Brachialis muscle?

A

Flexor of the elbow

34
Q

What is the action of the Pronator Teres muscle?

A

Pronator of the forearm and weak flexor of the elbow

35
Q

What is the action of the Flexor Carpi Radialis muscle?

A

Flexor of the wrist
abducts the wrist

36
Q

What is the action of the Palmaris Longus muscle?

A

Weak flexor of the wrist

37
Q

What is the action of the Flexor Carpi Ulnaris muscle?

A

Flexor and adductor of the wrist

38
Q

What is the action of the Flexor Digitorum Superficialis muscle?

A

Flexion of the proximal interphalangeal joints

39
Q

What is the action of the Flexor Pollicis Longus muscle?

A

Flexor of the thumb

40
Q

What is the action of the Flexor Digitorum Profundus muscle?

A

Flexor of the distal interphalangeal joints
helps in wrist flexion

41
Q

What is the action of the Pronator Quadratus muscle?

A

Principle pronator

42
Q

Wha is the action of the Palmaris Brevis muscle?

A

Improves the grip by steadying the skin on the ulnar side

43
Q

What is the action of the Lumbricals (1-4) muscles?

A

Flexion of the metacarpophalangeal joints and extension of the interphalangeal joints

44
Q

What is the action of the Palmar and Dorsal Interossei?

A

Adductors (Palmar - PAD) and abductors (Dorsal - DAB) of the fingers

MSK (11 decks)

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