Podcast
Questions and Answers
Which muscle is responsible for flexion and abduction of the wrist joint?
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?
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?
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?
What is the action of the Pronator teres muscle?
Which muscle is part of the Deep Group of muscles in the forearm?
Which muscle is part of the Deep Group of muscles in the forearm?
Which of the following muscles is supplied by the Median nerve?
Which of the following muscles is supplied by the Median nerve?
What is the location of the cubital fossa?
What is the location of the cubital fossa?
What is the function of the radial nerve?
What is the function of the radial nerve?
What is the name of the vein that links the cephalic vein and basilic vein in the cubital fossa?
What is the name of the vein that links the cephalic vein and basilic vein in the cubital fossa?
Which muscle originates from the medial epicondyle of the humerus?
Which muscle originates from the medial epicondyle of the humerus?
What is the common origin of muscles in the superficial group?
What is the common origin of muscles in the superficial group?
What is the function of the pronator teres muscle?
What is the function of the pronator teres muscle?
How many muscles are present in the deep group of the anterior compartment?
How many muscles are present in the deep group of the anterior compartment?
Which muscle does not insert into a metacarpal bone?
Which muscle does not insert into a metacarpal bone?
Tennis elbow is caused by?
Tennis elbow is caused by?
Which muscle extends the thumb?
Which muscle extends the thumb?
Which muscle has an insertion on the 5th metacarpal bone?
Which muscle has an insertion on the 5th metacarpal bone?
What is the action of Brachioradialis?
What is the action of Brachioradialis?
What is compressed in Carpal Tunnel Syndrome?
What is compressed in Carpal Tunnel Syndrome?
What is the anatomical structure that can be palpated in the floor of the Anatomical Snuffbox?
What is the anatomical structure that can be palpated in the floor of the Anatomical Snuffbox?
Which of the following is NOT a manifestation of Carpal Tunnel Syndrome?
Which of the following is NOT a manifestation of Carpal Tunnel Syndrome?
What is the name of the hand deformity resulting from Carpal Tunnel Syndrome?
What is the name of the hand deformity resulting from Carpal Tunnel Syndrome?
Which structure is NOT deep to the Flexor Retinaculum (Carpal Tunnel)?
Which structure is NOT deep to the Flexor Retinaculum (Carpal Tunnel)?
What is the name of the triangular space on the radial side of the dorsal wrist?
What is the name of the triangular space on the radial side of the dorsal wrist?
What is the function of the lumbrical muscles in the hand?
What is the function of the lumbrical muscles in the hand?
Which nerve supplies the 1st and 2nd lumbrical muscles?
Which nerve supplies the 1st and 2nd lumbrical muscles?
What is the origin of the lumbrical muscles?
What is the origin of the lumbrical muscles?
How many dorsal interossei muscles are there in the hand?
How many dorsal interossei muscles are there in the hand?
What is the action of the palmar interossei muscles?
What is the action of the palmar interossei muscles?
Which group of muscles includes the flexor pollicis brevis?
Which group of muscles includes the flexor pollicis brevis?
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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Description
Test your knowledge of the elbow joint anatomy, including the cubital fossa, olecranon process, and surrounding muscles and nerves.
