extensor pollicis brevis वाक्य
उदाहरण वाक्य
मोबाइल
- The 1st compartment contains abductor pollicis longus and extensor pollicis brevis.
- The lateral surface is marked by a flat groove for the tendons of the abductor pollicis longus and extensor pollicis brevis.
- The extensor pollicis brevis and flexor pollicis longus allow modern humans to have great manipulative skills and strong flexion in the thumb.
- Its lower part is narrow, and covered by the tendons of the abductor pollicis longus muscle and extensor pollicis brevis muscle.
- Where it lies upon the abductor pollicis longus and the extensor pollicis brevis, it is accompanied by the dorsal interosseous nerve.
- A part of the tendon reaches the trapezium, while another fuses with the tendons of the extensor pollicis brevis and the abductor pollicis brevis.
- Other muscles in the forearm also innervated by the radial nerve are supinator, extensor pollicis brevis, extensor pollicis longus, and abductor pollicis longus.
- It obliquely crosses the tendons of the extensor pollicis brevis by a triangular interval, the anatomical snuff box in which the radial artery is found.
- It also applies an extensor force at the metacarpophalangeal joint together with the extensor pollicis brevis and extends and adducts at the carpometacarpal joint of the thumb.
- The extensor pollicis brevis ( EPB ) originates on the ulna distal to the abductor pollicis longus, from the interosseus membrane, and from the dorsal side of the radius.
- So for example, the " flexor pollicis longus " and " flexor pollicis brevis " oppose the " extensor pollicis longus " and the " extensor pollicis brevis " in the movement of the thumb.
- Passing obliquely downward and lateralward, it ends in a tendon, which runs through a groove on the lateral side of the lower end of the radius, accompanied by the tendon of the extensor pollicis brevis.
- Weak or absent extensors and / or abductors ( the extensor pollicis brevis tendon, the extensor pollicis longus tendon or, rarely, the abductor pollicis longus tendon ), can cause a disbalance, leading to an abnormal position of the thumb : congenital clasped thumb.
- The "'dorsal surface "'( " facies dorsalis; posterior surface " ) is convex, and smooth in the upper third of its extent, and covered by the Abductor pollicis longus above, and the extensor pollicis brevis muscle below.
- The tendons of the extensor pollicis longus and extensor pollicis brevis form what is known as the anatomical snuff box ( an indentation on the lateral aspect of the thumb at its base ) The radial artery can be palpated anteriorly at the wrist ( not in the snuffbox ).
- The fibres end approximately at the middle of the forearm in the form of a flat tendon, which is closely connected with that of the extensor carpi radialis longus, and accompanies it to the wrist; it passes beneath the abductor pollicis longus and extensor pollicis brevis, beneath the extensor retinaculum, and inserts into the lateral dorsal surface of the base of the third metacarpal bone, with a few fibres inserting into the medial dorsal surface of the second metacarpal bone.
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