Elbow Anatomy Quiz: Master the Elbow Joint

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Questions and Answers

Which muscle is responsible for flexion and abduction of the wrist joint?

Pronator teres

Flexor digitorum superficialis

Flexor carpi radialis (correct)

Extensor carpi radialis longus

What is the nerve supply of the Flexor carpi ulnaris muscle?

Radial nerve

Median nerve

Axillary nerve

Ulnar nerve (correct)

Which muscle is inserted into the distal phalanx of the thumb?

Pronator teres

Flexor pollicis longus (correct)

Extensor digitorum

Flexor digitorum profundus

What is the action of the Pronator teres muscle?

Pronation of the forearm Signup and view all the answers

Which muscle is part of the Deep Group of muscles in the forearm?

Flexor pollicis longus Signup and view all the answers

Which of the following muscles is supplied by the Median nerve?

All muscles of the front of the forearm except Flexor carpi ulnaris Signup and view all the answers

What is the location of the cubital fossa?

In front of the elbow Signup and view all the answers

What is the function of the radial nerve?

Strong extensor of the elbow joint Signup and view all the answers

What is the name of the vein that links the cephalic vein and basilic vein in the cubital fossa?

Median cubital vein Signup and view all the answers

Which muscle originates from the medial epicondyle of the humerus?

All 5 muscles of the superficial group Signup and view all the answers

What is the common origin of muscles in the superficial group?

Lateral epicondyle of the humerus Signup and view all the answers

What is the function of the pronator teres muscle?

Pronator of the forearm Signup and view all the answers

How many muscles are present in the deep group of the anterior compartment?

3 Signup and view all the answers

Which muscle does not insert into a metacarpal bone?

Brachioradialis Signup and view all the answers

Tennis elbow is caused by?

Repeated or violent extension of the wrist with forearm pronated Signup and view all the answers

Which muscle extends the thumb?

Extensor pollicis longus Signup and view all the answers

Which muscle has an insertion on the 5th metacarpal bone?

Extensor carpi ulnaris Signup and view all the answers

What is the action of Brachioradialis?

Flexion and extension of the elbow joint Signup and view all the answers

What is compressed in Carpal Tunnel Syndrome?

Median nerve Signup and view all the answers

What is the anatomical structure that can be palpated in the floor of the Anatomical Snuffbox?

Scaphoid bone Signup and view all the answers

Which of the following is NOT a manifestation of Carpal Tunnel Syndrome?

Paresthesia over the thenar eminence Signup and view all the answers

What is the name of the hand deformity resulting from Carpal Tunnel Syndrome?

Ape Hand Signup and view all the answers

Which structure is NOT deep to the Flexor Retinaculum (Carpal Tunnel)?

Extensor pollicis brevis Signup and view all the answers

What is the name of the triangular space on the radial side of the dorsal wrist?

Anatomical Snuffbox Signup and view all the answers

What is the function of the lumbrical muscles in the hand?

Flexion of metacarpophalangeal joints and extension of interphalangeal joints Signup and view all the answers

Which nerve supplies the 1st and 2nd lumbrical muscles?

Median nerve Signup and view all the answers

What is the origin of the lumbrical muscles?

Tendons of flexor digitorum profundus Signup and view all the answers

How many dorsal interossei muscles are there in the hand?

4 Signup and view all the answers

What is the action of the palmar interossei muscles?

Adduction of fingers toward the center of the middle one Signup and view all the answers

Which group of muscles includes the flexor pollicis brevis?

Lateral group Signup and view all the answers

Study Notes

Forearm Muscles

Superficial Group (7): Brachioradialis, Extensor carpi radialis longus, Extensor carpi radialis brevis, Extensor digitorum, Extensor digiti minimi, Extensor carpi ulnaris, Anconeus
Common extensor origin: All muscles of the superficial group arise from the front of the lateral epicondyle of the humerus

Extensor Muscles

Extensor carpi radialis longus: inserts into the 2nd metacarpal bone, action: extension of the wrist joint
Extensor carpi radialis brevis: inserts into the 3rd metacarpal bone, action: extension of the wrist joint
Extensor digitorum: inserts into the middle and distal phalanges of medial 4 fingers, action: extension of the fingers
Extensor digiti minimi: inserts into the 5th metacarpal bone, action: extension of the little finger
Extensor carpi ulnaris: inserts into the 5th metacarpal bone, action: extension of the wrist joint
Anconeus: action: extension of the elbow joint

Flexor Muscles

Flexor carpi radialis: inserts into the 2nd and 3rd metacarpal bones, action: flexion and abduction of the wrist joint
Flexor carpi ulnaris: inserts into the 5th metacarpal bone, action: flexion and adduction of the wrist joint
Flexor digitorum superficialis: inserts into the middle phalanges of medial 4 fingers, action: flexion of the fingers
Flexor digitorum profundus: inserts into the distal phalanges of medial 4 fingers, action: flexion of the fingers
Flexor pollicis longus: inserts into the distal phalanx of the thumb, action: flexion of the thumb

Nerve Supply

Median nerve: supplies all muscles of the front of the forearm except Flexor carpi ulnaris and medial half of Flexor digitorum profundus
Ulnar nerve: supplies Flexor carpi ulnaris and medial half of Flexor digitorum profundus

Carpal Tunnel

Contents: tendons of flexor digitorum superficialis and profundus, median nerve, flexor pollicis longus
Causes of Carpal Tunnel Syndrome: compression of the median nerve within the carpal tunnel
Manifestations: burning pain, weakness or atrophy of the thenar muscles, and no paresthesia over the thenar eminence

Anatomical Snuffbox

Boundaries: formed by the tendons of the thumb, lateral: extensor pollicis brevis and abductor pollicis longus, medial: extensor pollicis longus
Contents: superficial radial nerve and cephalic vein pass superficial to the snuffbox, radial artery
Clinical Anatomy: significant with respect to the scaphoid bone, which can be palpated in its floor

Cubital Fossa

Boundaries: base: line drawn through the two epicondyles of humerus, medially: pronator teres muscle, laterally: brachioradialis muscle
Roof: skin, superficial and deep fascia, and bicipital aponeurosis
Floor: medially: brachialis muscle, laterally: supinator muscle

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Test your knowledge of the elbow joint anatomy, including the cubital fossa, olecranon process, and surrounding muscles and nerves.

Anatomy of the Elbow Joint

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