Anatomy of Thumb and Wrist Muscles Quiz

Human Anatomy

Physiology

NBME

USMLE

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| Attempts: 11 | Questions: 12 | Updated: Nov 6, 2025

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1. What is the origin, insertion, action, and nerve supply of FLEXOR POLLICIS LONGUS?

BRACHIORADIALIS: Origin - Lateral supracondylar ridge of the humerus, Insertion - Styloid process of radius, Action - Flexes elbow, supinates... BRACHIORADIALIS: Origin - Lateral supracondylar ridge of the humerus, Insertion - Styloid process of radius, Action - Flexes elbow, supinates forearm, Nerve Supply - Radial nerve

FLEXOR POLLICIS LONGUS O: ANTERIOR SURFACE OF THE RADIUS & INTEROSSEOUS MEMBRANE I: DISTAL PHALANGE OF THE THUMB A: FLEXES:... FLEXOR POLLICIS LONGUS O: ANTERIOR SURFACE OF THE RADIUS & INTEROSSEOUS MEMBRANE I: DISTAL PHALANGE OF THE THUMB A: FLEXES: IP, MCP, CMC OPPOSITION: CMC N: MEDIAN

EXTENSOR DIGITORUM LONGUS: Origin - Lateral condyle of the tibia, Insertion - Distal phalanges of fingers 2-5, Action - Extends... EXTENSOR DIGITORUM LONGUS: Origin - Lateral condyle of the tibia, Insertion - Distal phalanges of fingers 2-5, Action - Extends fingers at IP, MCP, wrist, Nerve Supply - Deep peroneal nerve

BICEPS BRACHII: Origin - Short head: Coracoid process of scapula, Long head: Supraglenoid tubercle of scapula, Insertion - Radial tuberosity,... BICEPS BRACHII: Origin - Short head: Coracoid process of scapula, Long head: Supraglenoid tubercle of scapula, Insertion - Radial tuberosity, Action - Flexes elbow, supinates forearm, Nerve Supply - Musculocutaneous nerve

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About This Quiz

Anatomy Of Thumb and Wrist Muscles Quiz - Quiz

Explore the intricate muscles of the hand and wrist through this focused assessment. Designed to enhance your understanding and identification skills, this quiz is ideal for students and professionals in medical fields, providing a practical approach to learning muscle functions and locations.

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2. What is the function of FLEXOR POLLICIS BREVIS?

Adducts: MCP, CMC

FLEXOR POLLICIS BREVIS O: SUPERFICIAL HEAD FLEXOR RETICULUM I: BASE OF PROXIMAL PHALANGE OF THUMB A: FLEXES: MCP, CMC N:... FLEXOR POLLICIS BREVIS O: SUPERFICIAL HEAD FLEXOR RETICULUM I: BASE OF PROXIMAL PHALANGE OF THUMB A: FLEXES: MCP, CMC N: MEDIAN/ULNAR

Extends: MCP, CMC

Abducts: MCP, CMC

Flexor Pollicis Brevis is a muscle that functions to flex the metacarpophalangeal (MCP) and carpometacarpal (CMC) joints of the thumb. Therefore, options mentioning extension, abduction, or adduction are incorrect in this context.

Explanation

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3. What is the origin, insertion, action, and innervation of the Extensor Pollicis Longus muscle?

FLEXOR POLLICIS LONGUS O: ANTERIOR SIDE OF RADIUS I: PROXIMAL PHALANGE OF INDEX FINGER A: FLEXES: IP N: ULNAR

EXTENSOR POLLICIS LONGUS O: POSTERIOR SIDE OF ULNA I: DISTAL PHALANGE OF THUMB A: EXTENDS: IP, MCP, CMC REOPPOSITION/ABDUCTION: CMC... EXTENSOR POLLICIS LONGUS O: POSTERIOR SIDE OF ULNA I: DISTAL PHALANGE OF THUMB A: EXTENDS: IP, MCP, CMC REOPPOSITION/ABDUCTION: CMC N: RADIAL

ABDUCTOR POLICIS BREVIS O: SCAPHOID AND TRAPEZIUM BONES I: PROXIMAL PHALANX OF THUMB A: ABDUCTION AT FIRST CARPOMETACARPAL JOINT N:... ABDUCTOR POLICIS BREVIS O: SCAPHOID AND TRAPEZIUM BONES I: PROXIMAL PHALANX OF THUMB A: ABDUCTION AT FIRST CARPOMETACARPAL JOINT N: MEDIAN

PRONATOR QUADRATUS O: MEDIAL EPICONDYLE OF HUMERUS I: LATERAL EPICONDYLE OF HUMERUS A: PRONATES FOREARM N: RADIAL

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4. Where does the Extensor Pollicis Brevis originate from?

Medial side of humerus

EXTENSOR POLLICIS BREVIS O: POSTERIOR SIDE OF ULNA I: PROXIMAL PHALANGE OF THUMB A: EXTENDS: MCP, CMC N: RADIAL

Lateral side of scapula

Anterior side of radius

The Extensor Pollicis Brevis originates from the POSTERIOR SIDE OF ULNA. It is responsible for extending the MCP and CMC joints of the thumb.

Explanation

The Extensor Pollicis Brevis originates from the POSTERIOR SIDE OF ULNA. It is responsible for extending the MCP and CMC joints of the thumb.

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5. What is the origin, insertion, action, and nerve supply of ABDUCTOR POLLICIS LONGUS?

O: PROXIMAL ASPECT OF FEMUR, I: PATELLA, A: FLEX/EXTEND: KNEE JOINT, N: SCIATIC

O: ANTERIOR SURFACE OF RADIUS/ULNA & INTEROSSEOUS MEMBRANE, I: BASE OF 2nd METACARPAL, A: FLEX/ADDUCT: CMC, N: RADIAL

ABDUCTOR POLLICIS LONGUSO: POSTERIOR SURFACE OF RADIUS/ULNA & INTEROSSEOUS MEMBRANEI: BASE OF 1st METACARPALA: ABDUCT/ EXTEND/ OPPOSITION: CMCN: RADIAL

O: LATERAL EPICONDYLE OF HUMERUS, I: PISIFORM BONE, A: EXTEND/OPPOSITION/ADDUCTION: CMC, N: MEDIAN

The correct origin and insertion of ABDUCTOR POLLICIS LONGUS are on the posterior surface of the radius/ulna and the interosseous membrane, respectively. Its action involves abduction, extension, and opposition at the carpometacarpal (CMC) joint, and it is innervated by the radial nerve.

Explanation

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6. What is the origin, insertion, action, and nerve supply of extensor carpi radialis longus?

EXTENSOR CARPI ULNARIS - O: LATERAL EPICONDYLE OF HUMERUS, I: BASE OF 5th METACARPAL, A: EXTEND WRIST/ ULNAR DEVIATION (RC... EXTENSOR CARPI ULNARIS - O: LATERAL EPICONDYLE OF HUMERUS, I: BASE OF 5th METACARPAL, A: EXTEND WRIST/ ULNAR DEVIATION (RC JOINT), N: ULNAR

FLEXOR CARPI ULNARIS - O: MEDIAL EPICONDYLE OF HUMERUS, I: BASE OF 2nd METACARPAL, A: FLEX WRIST/ RADIAL DEVIATION (RC... FLEXOR CARPI ULNARIS - O: MEDIAL EPICONDYLE OF HUMERUS, I: BASE OF 2nd METACARPAL, A: FLEX WRIST/ RADIAL DEVIATION (RC JOINT), N: MEDIAN

FLEXOR CARPI RADIALIS LONGUS - O: MEDIAL SUPRACONDYLAR RIDGE OF HUMERUS, I: BASE OF 5th METACARPAL, A: FLEX WRIST/ ULNAR... FLEXOR CARPI RADIALIS LONGUS - O: MEDIAL SUPRACONDYLAR RIDGE OF HUMERUS, I: BASE OF 5th METACARPAL, A: FLEX WRIST/ ULNAR DEVIATION (RC JOINT), N: ULNAR

EXTENSOR CARPI RADIALIS LONGUSO: LATERAL SUPRACONDYLAR RIDGE OF HUMERUSI: BASE OF 2nd METACARPAL A: EXTEND WRIST/ RADIAL DEVIATION (RC JOINT)N:... EXTENSOR CARPI RADIALIS LONGUSO: LATERAL SUPRACONDYLAR RIDGE OF HUMERUSI: BASE OF 2nd METACARPAL A: EXTEND WRIST/ RADIAL DEVIATION (RC JOINT)N: RADIAL

The extensor carpi radialis longus originates from the lateral supracondylar ridge of the humerus and inserts into the base of the 2nd metacarpal. Its action involves extending the wrist and radial deviation at the radiocarpal joint, and it is innervated by the radial nerve. The other options provided have different origins, insertions, actions, and nerve supplies compared to the extensor carpi radialis longus, making them incorrect choices.

Explanation

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7. What is the origin, insertion, action, and nerve supply of EXTENSOR CARPI ULNARIS?

O: COMMON EXTENSOR TENDON FROM MEDIAL EPICONDYLE OF HUMERUS, I: BASE OF 4th METACARPAL, A: FLEX ELBOW/ ULNAR DEVIATION (AC... O: COMMON EXTENSOR TENDON FROM MEDIAL EPICONDYLE OF HUMERUS, I: BASE OF 4th METACARPAL, A: FLEX ELBOW/ ULNAR DEVIATION (AC JOINT), N: ULNAR

EXTENSOR CARPI ULNARISO: COMMON EXTENSOR TENDON FROM LATERAL EPICONDYLE OF HUMERUSI: BASE OF 5th METACARPALA: EXTEND WRIST/ ULNAR DEVIATION (RC... EXTENSOR CARPI ULNARISO: COMMON EXTENSOR TENDON FROM LATERAL EPICONDYLE OF HUMERUSI: BASE OF 5th METACARPALA: EXTEND WRIST/ ULNAR DEVIATION (RC JOINT)N: RADIAL

O: COMMON FLEXOR TENDON FROM LATERAL EPICONDYLE OF HUMERUS, I: BASE OF 2nd METACARPAL, A: EXTEND WRIST/ RADIAL DEVIATION (AC... O: COMMON FLEXOR TENDON FROM LATERAL EPICONDYLE OF HUMERUS, I: BASE OF 2nd METACARPAL, A: EXTEND WRIST/ RADIAL DEVIATION (AC JOINT), N: MEDIAN

O: COMMON FLEXOR TENDON FROM MEDIAL EPICONDYLE OF HUMERUS, I: BASE OF 3rd METACARPAL, A: FLEX WRIST/ RADIAL DEVIATION (RC... O: COMMON FLEXOR TENDON FROM MEDIAL EPICONDYLE OF HUMERUS, I: BASE OF 3rd METACARPAL, A: FLEX WRIST/ RADIAL DEVIATION (RC JOINT), N: MEDIAN

The correct answer describes the origin, insertion, action, and nerve supply of EXTENSOR CARPI ULNARIS while the incorrect answers provide inaccurate details about different tendons, metacarpals, actions, and nerve supplies.

Explanation

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8. What is the function of the flexor carpi radialis muscle?

Extends elbow/flexes knee

Abducts shoulder/adducts hip

Rotates forearm/supinates hand

FLEXOR CARPI RADIALISO: COMMON FLEXOR TENDON FROM MEDIAL EPICONDYLEI: BASE 2nd & 3rd METACARPALSA: FLEXES WRIST/ RADIAL DEVIATION (RC JOINT)N:... FLEXOR CARPI RADIALISO: COMMON FLEXOR TENDON FROM MEDIAL EPICONDYLEI: BASE 2nd & 3rd METACARPALSA: FLEXES WRIST/ RADIAL DEVIATION (RC JOINT)N: MEDIAN

The flexor carpi radialis muscle originates from the medial epicondyle and inserts at the base of the 2nd and 3rd metacarpals. Its function is to flex the wrist and perform radial deviation at the radiocarpal joint. The muscle is innervated by the median nerve.

Explanation

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9. What is the function of FLEXOR CARPI ULNARIS?

FLEXOR CARPI ULNARISO: HUMERAL HEAD: COMMON FLEXOR TENDON FROM MEDIAL EPICONDYLEULNAR HEAD: POSTERIOR PROXIMAL bHALF SURFACE OF ULNAR I: PISIFORMA:... FLEXOR CARPI ULNARISO: HUMERAL HEAD: COMMON FLEXOR TENDON FROM MEDIAL EPICONDYLEULNAR HEAD: POSTERIOR PROXIMAL bHALF SURFACE OF ULNAR I: PISIFORMA: FLEXES WRIST, ULNAR DEVIATIONN: ULNAR

Extends wrist, radial deviation

Flexes elbow, radial deviation

Abducts wrist, ulnar deviation

The correct function of FLEXOR CARPI ULNARIS is to flex the wrist and perform ulnar deviation.

Explanation

The correct function of FLEXOR CARPI ULNARIS is to flex the wrist and perform ulnar deviation.

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10. What is the origin, insertion, action, and nerve supply of the Flexor Digitorum Profundus muscle?

O: Lateral surface of humerus, I: By 3 tendons into base of proximal phalanges plantar surface of 3rd-5th toes, A:... O: Lateral surface of humerus, I: By 3 tendons into base of proximal phalanges plantar surface of 3rd-5th toes, A: Flex 3-5 toes: MTP, N: Tibial

O: Anterior surface of scapula, I: By 5 tendons into base of metacarpal bones dorsal surface of 2nd-5th fingers, A:... O: Anterior surface of scapula, I: By 5 tendons into base of metacarpal bones dorsal surface of 2nd-5th fingers, A: Abduct 2-5 fingers: CMC, N: Radial/Ulnar

O: Posterior surface of distal 3 quarters of radius, I: By 2 tendons into base of middle phalanges dorsal surface... O: Posterior surface of distal 3 quarters of radius, I: By 2 tendons into base of middle phalanges dorsal surface of 2nd-4th fingers, A: Extend 2-4 fingers: PIP, N: Radial

FLEXOR DIGITORUM PROFUNDUSO: ANTERIOR & MEDIAL SURFACES OF PROXIMAL 3QUARTERS OF ULNAI: BY 4 TENDONS INTO BASE OF DISTAL PHALANGESPALMAR... FLEXOR DIGITORUM PROFUNDUSO: ANTERIOR & MEDIAL SURFACES OF PROXIMAL 3QUARTERS OF ULNAI: BY 4 TENDONS INTO BASE OF DISTAL PHALANGESPALMAR SURFACE OF 2nd-5th FINGERSA: FLEX 2-5 FINGERS: MCP, DIPN: MEDIAN/ULNAR

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11. Which 2 flexor muscles innervate the median and ulnar nerve?

Brachioradialis, Pronator teres

Flexor carpi radialis, Flexor carpi ulnaris

FLEXOR DIGITORUM PROFUNDUS-MEDIAN/ULNARFLEXOR POLLICIS BREVIS- MEDIAN/ULNAR

Palmaris longus, Extensor digitorum

The correct answer consists of 2 flexor muscles that innervate both the median and ulnar nerve, while the incorrect answers are other combinations of flexor muscles that do not share this innervation pattern.

Explanation

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12. Which flexor muscle innervates the ulnar nerve?

FLEXOR CARPI ULNARIS - ULNAR

Flexor digitorum profundus

Flexor pollicis longus

Flexor digitorum superficialis

The correct answer is Flexor carpi ulnaris, as it is the only flexor muscle that innervates the ulnar nerve. The other three muscles mentioned do not directly innervate the ulnar nerve.

Explanation

The correct answer is Flexor carpi ulnaris, as it is the only flexor muscle that innervates the ulnar nerve. The other three muscles mentioned do not directly innervate the ulnar nerve.

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