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OTD Anatomy Test 1 Questions and
Answers (100% Pass)
extensor retinaculum
✓ holds tendons of extensor muscles in place
Muscles of posterior antebrachial compartment (lateral to medial)
✓ abductor pollicis longus (APL)
✓ extensor pollicis brevis (EPB)
✓ extensor carpi radialis longus (ECRL)
✓ extensor carpi radialis brevis (ECRB)
✓ extensor pollicis longus (EPL)
✓ extensor indicis (EI)
✓ extensor digitorum (ED)
✓ extensor digiti minimi (EDM)
✓ extensor carpi ulnaris (ECU)
Outcropping extensors
Master01 | October, 2024/2025 | Latest update
, 1|Page | © copyright 2024/2025 | Grade A+
✓ to thumb:
✓ - abductor pollicis longus
✓ - extensor pollicis brevis
✓ - extensor pollicis longus
✓ - extensor indicis
Posterior compartment function
✓ wrist/hand extensors, supination
Primary innervation of posterior compartment
✓ branches of radial N (deep & superficial)
Posterior compartment (superficial muscles) common site of attachment
✓ lateral epicondyle of humerus
pathway of the radial N
✓ deep radial wraps posteriorly > posterior interosseous after supinator
pathway of the ulnar nerve
Master01 | October, 2024/2025 | Latest update
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✓ runs posterior to lateral epicondyle, runs anterior afterwards
Superficial posterior antebrachium muscles (superior to inferior)
✓ brachioradials
✓ ECRL
✓ ECRB
✓ ED
✓ EDM
✓ ECU
Brachioradialis OIA
✓ O - proximal 2/3 of lateral supracondylar ridge
✓ I - distal radius, proximal to styloid process
✓ A - flex forearm when midprone, pronation, supination
Brachioradialis blood supply & innervation
✓ B - radial collateral A, radial recurrent A, radial A
✓ I - radial N
Extensor carpi radialis longus OIA
Master01 | October, 2024/2025 | Latest update
OTD Anatomy Test 1 Questions and
Answers (100% Pass)
extensor retinaculum
✓ holds tendons of extensor muscles in place
Muscles of posterior antebrachial compartment (lateral to medial)
✓ abductor pollicis longus (APL)
✓ extensor pollicis brevis (EPB)
✓ extensor carpi radialis longus (ECRL)
✓ extensor carpi radialis brevis (ECRB)
✓ extensor pollicis longus (EPL)
✓ extensor indicis (EI)
✓ extensor digitorum (ED)
✓ extensor digiti minimi (EDM)
✓ extensor carpi ulnaris (ECU)
Outcropping extensors
Master01 | October, 2024/2025 | Latest update
, 1|Page | © copyright 2024/2025 | Grade A+
✓ to thumb:
✓ - abductor pollicis longus
✓ - extensor pollicis brevis
✓ - extensor pollicis longus
✓ - extensor indicis
Posterior compartment function
✓ wrist/hand extensors, supination
Primary innervation of posterior compartment
✓ branches of radial N (deep & superficial)
Posterior compartment (superficial muscles) common site of attachment
✓ lateral epicondyle of humerus
pathway of the radial N
✓ deep radial wraps posteriorly > posterior interosseous after supinator
pathway of the ulnar nerve
Master01 | October, 2024/2025 | Latest update
, 1|Page | © copyright 2024/2025 | Grade A+
✓ runs posterior to lateral epicondyle, runs anterior afterwards
Superficial posterior antebrachium muscles (superior to inferior)
✓ brachioradials
✓ ECRL
✓ ECRB
✓ ED
✓ EDM
✓ ECU
Brachioradialis OIA
✓ O - proximal 2/3 of lateral supracondylar ridge
✓ I - distal radius, proximal to styloid process
✓ A - flex forearm when midprone, pronation, supination
Brachioradialis blood supply & innervation
✓ B - radial collateral A, radial recurrent A, radial A
✓ I - radial N
Extensor carpi radialis longus OIA
Master01 | October, 2024/2025 | Latest update
