Re: Extensor Region of Forearm and Dorsum of Hand: True/False

Comments:
: : : Extensor Region of Forearm and Dorsum of Hand: Learning Objectives and Review Questions : : : * True/False : : : * Short Answer and Definitions : : : * Essay : : : * Comments and Suggestions : : : True/False : : : 1. The fiber direction of the interosseous membrane is from distal ulnar to proximal radial. : : True : True is the intended answer. This direction resists proximal displacement. : : : 2. The nerve that circles the radius deep to the supinator muscle is the deep radial nerve. : : True : True is the intended answer. : : : 3. The radial nerve divides within the cubital fossa into a superficial radial nerve and a deep radial nerve (this is true). : : True : True is the intended answer. : : : 4. The innervation to the muscles of the "outcropping" and the extensor indicis is provided by the posterior interosseus nerve. : : True - what is the outcropping? : True is the intended answer. The outcropping refers to those muscles that have the appearance of an outcropping; tautological I know. The muscles that contribute the boundaries of the anatomical snuff box. : : : 5. Despite that adbductor pollicis longus does not cross the MB joint is is still agonistic to thumb extension. : : True : True is the intended answer. I don't remember what inspired me to write this. It might be from Hollinshead. : : : 6. Extensor indicis extends the index finger independent of extensor digitorum. : : True : True is the intended answer. EI is not tethered to ED. : : : 7. The anatomical snuff box has the extensor pollicis longus as the anterolateral border. : : False - the medial border : FALSE is the intended answer. The posterior medial border. Note anatomical postition. : : : 8. Anterior to the radial artery, within the anatomical snuffbox, is the scaphoid bone. : : True : True is the intended answer. : : : 9. The dorsal carpal arch (rete) receives blood from the anterior interosseous artery. : : True : True is the intended answer. Counterintuitive, eh? I spent time in Canada. : : : 10. Dorsal metacarpal arteries pass the posterior surfaces of the dorsal interosseous muscles. : : True : True is the intended answer. : : : 11. Palmar metacarpal arteries pass the anterior surfaces of the palmar interosseous muscles. : : True : True is the intended answer. : : : 12. A branch of the superficial radial nerve can be palpated as it crosses the tendon of extensor pollicis longus as this tendon provides a border for the antomical snuffbox. : : True : True is the intended answer. Roll this nerve around your tendon. : : : 13. The muscles taking orgin from the common extensor tendon (lateral humeral epicondyle) extend at the elbow. : : True - weakly : True is the intended answer. : : : 14. The extensor carpi radialis longus and brevis muscles are inneravated by the deep radial nerve. : : False - just brevis : True is the intended answer. This is a nightmare. Know an account. : : : 15. The extensor carpi ulnaris muscle is innervated by the posterior interosseus nerve. : : True : FALSE is the intended answer. Nevertheless, this is a mess and will not be a deal breaker on your examination. : : : 16. The supinator muscle is innervated by the posterior interosseous nerve. : : False - deep radial N. : FALSE is the intended answer. : : : 17. The extensor pollicis longus muscle is innervated by the deep radial nerve). : : False - post. interosseous N : FALSE is the intended answer. : : : 18. The extensor carpi radialis longus is considered primaritly a wrist extensor while the extensor carpi radialis brevis is a radial devator (abductor). : : False - reversed, longus more of a radial deviator bc attaches more radial : FALSE is the intended answer. : : : 19. The princips pollicis artery is a content of the anatomical snuff box. : : False - dives ant. through 1st dorsal inteross muscle : FALSE is the intended answer. : : : 20. The anterior interosseous artery is located on the posterior surface of the distal interosseous membrane. : : True - dives through IOM distally to anatomose with the post IO artery, and contributes to dorsal carpal arch : True is the intended answer. You did your homework here. : : : 21. The anterior interosseous artery contributes to the dorsal rete. : : True : True is the intended answer. The dorsal carpal rete or arch. : : : 22. There is a superior free edge of the interosseous membrane and superior to that is the oblique cord. : : True : True is the intended answer. Thus, carefull about suggesting that the posterior interosseous artery pierces the IO. : : : 23. The posterior interosseous artery travels with the deep radial nerve to arrive in the posterior compartment of the forearem. : : False - after passing the post border of the supinator, the deep radial N becomes the post IO artery : FALSE is the intended answer. The artery passes medial to the radius. The nerve passes lateral to the radius. The nerve does not become the artery. : : : 24. The interosseous recurrent artery passes through the heads of origin of the flexor carpi ulnaris. : : False - passes deep to the anconeous, the ant. ulnar recurrent passes through the heads of origin : FALSE is the intended answer. The posterior ulnar recurrent does this (FCU). : : : 25. The tendon(s) of abductor pollicis longus are immediately anterior to the tendons of extensor pollicis brevis when at the level of the anatomical snuff box. : : True : True is the intended answer. : : : 26. The finger that has a dorsal interosseous on the radial (lateral) side and a palmar interosseous on the ulnar (medial) side is the ring finger. : : False - the index finger : FALSE is the intended answer. : : : 27. The finger that nearly always has five tendons attaching to the extensor hood is the middle finger. : : False - ?? don't know about this, seems like i can only count 4 on every digit, except digiti minimi (3) : FALSE is the intended answer. The index finger has two long tendons and three intrinsic tendons. : : : 28. The fiber direction of the interosseous membrane resists proxmal movement of the radius. : : True : True is the intended answer. : : : 29. The anconeus muscle crosses the elbow joint. : : True : True is the intended answer. : : : 30. A lesion of the radial nerve at the spiral (radial) groove would paralyze the anconeus muscle. : : True : True is the intended answer. : : : 31. The interosseous recurrent artery is deep to the anconeus muscle. : : True : True is the intended answer. : : : 32. The posterior recurrent ulnar artery passes through the heads of origin of the extensor carpi radialis longus muscle. : : False - on so many levels : FALSE is the intended answer. : : : 33. The posterior interosseous artery and the posterior interosseous nerve are usually separated from each other by the extensor indicis and the muscles of the outcropping. : : False - ? : True was the intended answer. Open to debate? : : : 34. The extensors of the forearm are, in a sense, agonistic to the flexors of the forearm in mediating a firm grip. : : True : True is the intended answer. : : : 35. A lesion of the deep radial nerve as it spirals around the radius deep to supinator would cause the resting wrist position to be flexed and abducted. : : False - flexed yes but aDDucted : FALSE is the intended answer. : : : 36. A lesion of the superficial radial nerve would cause anesthesia of the nail beds of the radial 2.5 fingers. : : False - nail beds inn. by median : FALSE is the intended answer. : : : 37. The radial collateral ligament of the elbow contributes support to the anular ligament. : : True : True is the intended answer. : : : 38. The radial notch of the ulna resists proximal and distal dislocation of the radius. : : False - just proximanl : ????? Why did I write this question? I just don't remember. : : : 39. A total lesion of the posterior interosseous nerve (think snuff box and outcropping) would cause uncompensated loss of extension of the thumb. : : True : True was the intended answer. At least in the old days when nerves were nerves and books were scholarly. : : : 40. A total lesion of the posterior interosseous nerve (think snuff box and outcropping) would cause uncompensated loss of abduction of the thumb. : : False - compensation from thenar and median N. : FALSE is the intended answer. : : : 41. The tendons of extensor digitorum are secured to the metacarpal bones by vincula long and brevia. : : False - tendons of flexors : FALSE is the intended answer. The phalanges. Plus, they are mesotendons. Not the best tissue for providing security. : : : 42. Tendon sheaths for the long extensors/adbuctor of the forearm pass deep to the extensor retinaculum. : : True : : : True is the intended answer.

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