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CHT Exam Prep – Anatomy Questions and Answers
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CHT Exam Prep – Anatomy Questions and Answers
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CHT Exam Prep – Anatomy Questions and AnswersWhich structure is most often involved in flexion PIP contracture development? Others that
can be involved? Correct Ans-Check rein ligaments
Collateral ligaments of the PIP joint and the volar plate can also be involved.
Dorsal Compartments of the wrist Correct Ans-1st - APL and EPB
2nd - ECRL, ECRB
3rd - EPL
4th - EDC, EIP
5th - EDM
6th - ECU
Describe the ECRB, ECRL, and ECU and how they effect mvmd of the wrist. Correct Ans-
ECRB = most efficient and strongest extensor of the wrist. Originates from the lat episode of
the humerus and inserts onto the base of the 3rd metacarpal.
ECRL - has the longest muscle fibers and the largest mass, therefore has the capacity for
sustained work. More efficient as a radial deviator of the wrist. The extensor carpi radialis
longus (ECRL) has the most proximal origin of the extrinsic hand extensors. It originates just
distal to the brachioradialis at the lateral supracondylar ridge of the humerus, the lateral
intermuscular septum, and by a few fibers at the lateral epicondyle of the humerus. Inserts at
the base of the 2nd metacarpal.
, CHT Exam Prep – Anatomy Questions and Answers
ECU - has the longest moment arm for UD. ECU becomes a more efficient wrist extensor with
the FA in supination. It originates from the lateral epicondyle of the humerus and the
posterior border of the ulna, and crosses the forearm to the ulnar (medial) side to insert at
the base of the 5th metacarpal.
Cozen's Test Correct Ans-Resisted wrist extension with elbow flexed then extended.
Positive test is sharp pain at the lat epi.
Which tendon is typically involved with Trigger Finger? Correct Ans-FDS
Transverse carpal ligament attachments Correct Ans-Scaphoid tuberosity, crest of the
trapezium, pisiform, hook of hamate.
Martin-Gruber anastomosis Correct Ans-A communicating branch between median and
ulnar nerve occurs high in forearm therefore allows for intrinsic muscles to be innervated by
median nerve so can functions despite injury to sensory nerve. (Ulnar injury)
Riches-Cannieu Anastomosis Correct Ans-Communication bet the deep ulnar branch to the
recurrent median thenar branch and results in ulnar innervation of the thenar muscles.
Marinacci anastomosis Correct Ans-Communication bet the ulnar nerve and median nerve
in the FA. (reverse Martin-Gruber)
, CHT Exam Prep – Anatomy Questions and Answers
Berretini anastomosis Correct Ans-Communication bet the ulnar 4th common digital nerve
and the median 3rd common digital nerve.
Supinator Correct Ans-Originates from the lat epi of the humerus and the adjacent portion
of the ulna and inserts into the upper 3rd of the radius.
First volar interosseous Correct Ans-Originates from the length of the 2nd metacarpal and
adducts the index finger.
ECU Correct Ans-Innervated the the PIN and inserts into the base of the 5th metacarpal.
Abductor pollicis brevis Correct Ans-Innervated by the median nerve and originates from
the TCL. Inserts at the lateral base of the prox phx of the thumb.
First dorsal interosseous Correct Ans-Strong finger abductor that inserts into he base of
the prox phx of the index finger. origin on the adjacent surfaces of the first and second
metacarpal bones.
Adductor pollicis Correct Ans-Innervated by ulnar nerve and inserted into the ulnar side of
the prox phx of the thumb and the extensor expansion of the thumb.
Extensor Pollicis Longus Correct Ans-Innervated by the PIN and inserts into the first distal
phalanx. Origin at the dorsal surface of middle third of the ulna.
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