Bilateral congenital absence of flexor pollicis brevis and. The function of this muscle is to facilitate thumb flexion. Pdf a rare origin of abductor pollicis longus researchgate. Insertion over tendons of radial extensors and brachioradialis to base of proximal phalanx of thumb. The flexor pollicis brevis is mostly innervated by the recurrent branch of the median nerve c8, t1. The typicalappearing flexor carpi radialis brevis just proximal to the pronator quadratus easily might be mobilized ulnarly to improve exposure. Together with opponens pollicis, adductor pollicis and abductor pollicis brevis, it comprises the group of thenar muscles flexor pollicis brevis is composed of superficial and deep heads.
Flexor pollicis brevis is a short, broad intrinsic muscle of the hand. Pdf anatomical diversity in flexor pollicis longus muscle. Tendon of abductor pollicis longus tendon of extensor pollicis brevis tendon of extensor pollicis longus from a list of putative candidates, identify structures within the anatomical snuff box. It helps bend, rotate and move your thumb away from your hand. Flexor retinaculum and tubercles of scaphoid and trapezium. Cruveilhier described in 1834 the human flexor pollicis brevis fpb. Often this deep head is confused with henles interosseous palmaris volaris or said to be a. The abductor pollicis longus is a muscle that moves the thumb in multiple directions. The prevalence rates of an ahfpl significantly vary between studies, and no consensus has been reached on the numerous variations reported in its origin, innervation, and relationships to the anterior interosseous nerve ain and the. Flexor pollicis brevis deep peripheral nerve surgery. Specifically, this muscle originates from the front. Nerve recurrent muscular branch of median nerve c8, t1 may also be. Abductor pollicis longus muscle takes origin from the. The extensor pollicis brevis muscle can be found medially and deep to the abductor pollicis longus muscle.
Extends proximal phalanx of thumb at carpometacarpal joint innervation. Flexor pollicis brevis musculus flexor pollicis brevis anatomical parts. Insertion base of proximal phalanx of thumb via radial sesamoid. The flexor pollicis longus is a long thin muscle on the outer aspect of your forearm. Cruveilhier described in 1834 the human flexor pollicis brevis fpb, a muscle of the thenar compartment, as having a superficial and a deep head, respectively, inserted onto the radial and ulnar sesamoids of the thumb. Release of the adductor pollicis, flexor pollicis brevis, or first dorsal interosseous muscle origins or insertions. It is then lodged between the lateral head of the flexor pollicis brevis and the oblique part of the adductor pollicis. Identifying the flexor pollicis longus biel, 2005 origin. The muscles superficial head arises from the distal edge of the flexor retinaculum and the tubercle of the trapezium, the most lateral bone in the distal row of carpal bones. The median nerve continues distally through the carpal tunnel to innervate the index and middle finger lumbricals and the thenar muscles flexor pollicis brevis, opponens pollicis. Accessory head of flexor pollicis longus muscle and its. Insertion ulnar sesamoid then ulnar side of base of proximal phalanx and tendon of extensor pollicis longus.
Ulnar sesamoid then ulnar side of base of proximal phalanx and. The flexor pollicis longus muscle forms a part of the lower half of the arm which means it is located from the elbow moving downwards. The present case reports about a variation in the origin of abductor pollicis longus apl. Flexor pollicis brevis muscle an overview sciencedirect topics. Lateral side of base of proximal phalanx of thumb action. Identifying the flexor pollicis longus biel, 2005 university of washington radiology. Find the perfect flexor pollicis brevis stock photo. Posterior interosseous nerve c7 and c8, the continuation of the deep branch of the radial nerve arterial supply. Flexor pollicis brevis muscle synonyms, flexor pollicis brevis muscle pronunciation, flexor pollicis brevis muscle translation, english dictionary definition of flexor pollicis brevis muscle. Jan 26, 2015 the flexor pollicis longus muscle is located in the lower half of the arm, from the elbow down.
It is a thenar muscle, and therefore contributes to the bulk of the palms thenar eminence. Insertion base of proximal phalanx of thumb via radial sesamoid action flexes metacarpophalangeal joint of thumb. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Flexor pollicis brevis musculus flexor pollicis brevis imaios. Flexor pollicis brevis muscle definition of flexor pollicis.
The flexor pollicis longus is supplied by the anterior interosseous c8t1 branch of the median nerve c5t1. Flexor pollicis longus how is flexor pollicis longus. In the hand, its tendon contributes to the lateral border of the anatomical snuffbox. The majority of muscle fibers originate from the broadest origin area located on flexor retinaculum. Jul 01, 20 the standard anatomical description of the extensor pollicis brevis epb found in current anatomical textbooks describes its origin as the posterior surface of the radius and the adjacent part of the interosseous membrane, distal to the attachment of the abductor pollicis longus apl.
Exercising the abductor pollicis brevis muscle helps keep it healthy and maintains or restores function of the thumb. It originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from the. Want a crash course in the origin, insertion, and innervation. May 09, 2017 the flexor pollicis longus is a long thin muscle on the outer aspect of your forearm. Flexor pollicis brevis definition of flexor pollicis. Flexor pollicis longus how is flexor pollicis longus abbreviated. Radial artery floor palpable radial styloid process, 1st metacarpal scaphoid and trapezium can be felt in floor. Muscle tissue in the higher animals is classified as striated, smooth, or cardiac.
The objective is to provide surgeons and other healthcare providers the information critical for treating persons with complex peripheral nerve trauma. The thenar musculature consists of the abductor pollicis brevis apb, opponens pollicis, and flexor pollicis brevisall of which arise from the flexor retinaculum 9, 10. Find out information about flexor pollicis brevis muscle. Flexor pollicis brevis muscle article about flexor pollicis. A flexor carpi radialis brevis muscle with an anomalous. The flexor pollicis longus originates from the anterior surface of the radius and the interosseous membrane. This muscle is believed to be unique and present only in humans.
The flexor pollicis brevis is a muscle in the hand. Flexor pollicis brevis muscle an overview sciencedirect. The flexor pollicus longus attaches at the anterior surface of the radius, the bone in your forearm that forms the bend of your elbow. The flexor pollicis brevis is a muscle in the hand that flexes the thumb. The flexor pollicis brevis has the most distal origin off the flexor retinaculum. Check out this short video on the anatomy of the flexor pollicis longus muscle, including its origin, insertion, innervation and function. Highresolution mr imaging and us anatomy of the thumb. It is much larger than the extensor pollicis brevis, the origin of which it partly covers and acts.
Flexor pollicis longus medical definition merriamwebster. Adductor pollicis musculus adductor pollicis imaios. The flexor pollicis longus originates from the anterior surface of the radius and the interosseous membrane insertion. The superficial head of the flexor pollicis brevis originates from the flexor retinaculum. Clear explanations of natural written and spoken english. Posterior surfaces of radius and interosseous membrane insertion. In this paper, we report a case of a 23yearold male patient with bilateral absence of the flexor pollicis brevis and abductor pollicis brevis muscles with an intact functioning opponens pollicis and flexor pollicis longus muscles with bilateral thenar atrophy due to its rarity. The prevalence and anatomical characteristics of the. This video covers the most important muscle facts on the anatomy of the flexor pollicis brevis muscle, one of the four thenar muscles. The flexor pollicis brevis muscle is a muscle in the hand. Recurrent branch of median nerve c8 and t1 arterial supply.
Flexor retinaculum and tubercles of scaphoid and trapezium insertion. Flexor pollicis brevis muscle article about flexor. Origin flexor retinaculum and tubercle of trapezium. Furthermore, we found variability in the origin and included as important landmarks the trapezoid and the ligamentum carpi radiatum. The abductor pollicis brevis muscle is in the hand, running from the first joint of your thumb to the center of your wrist. Aug 25, 2015 this video covers the most important muscle facts on the anatomy of the flexor pollicis brevis muscle, one of the four thenar muscles. This is in opposition to the extensor pollicis brevis muscle, which extends. Flexor pollicis brevis questions and study guide quizlet. Since then, cruveilhiers deep head has been controversially discussed. Anatomical variations of the deep head of cruveilhier of the flexor. The accessory head of the flexor pollicis longus muscle ahfpl, also known as the gantzers muscle, was first described in 18. Insertion medial tendon to medial side of base of proximal phalanx of big toe. However, the deep head can vary in size and sometimes even be absent.
The adductor pollicis transversus adductor transversus pollicis is the most deeply seated of this group of. Flexor pollicis brevis definition of flexor pollicis brevis. The abductor pollicis brevis is a flat, thin muscle located just under the skin. Origin cuboid, lateral cuneiform and tibialis posterior insertion over the two remaining cuneiforms. The prevalence rates of an ahfpl significantly vary between studies, and no consensus has been reached on the numerous variations reported in its origin, innervation, and relationships to the anterior interosseous nerve ain. The ain innervates all the forearm flexors except the fcu and the ulnar half of the fdp. It is innervated by the anterior interosseous nerve, a branch of the median nerve. It flexes the thumb at the first metacarpophalagneal joint. Anatomical variations of the deep head of cruveilhier of. Origin, insertion, primary action secondary action, description, innervation, blood supply. The median nerve continues distally through the carpal tunnel to innervate the index and middle finger lumbricals and the thenar muscles flexor pollicis brevis, opponens pollicis, abductor pollicis brevis apb via its recurrent motor branch. It passes along the radial side of the tendon of the flexor pollicis longus the deeper and medial head varies in size and may be absent.
Looking for online definition of flexor pollicis brevis muscle in the medical dictionary. Insertion base of proximal phalanx of thumb via radial sesamoid action. Slips may connect with flexor digitorum superficialis muscle, flexor digitorum profundus muscle resulting. Lateral tendon to lateral side of same, both via sesamoids action. Flexor hallucis brevis mpn adductor hallucis lpn flexor digiti minimi brevis lpn. A considerable fasciculus, however, passes more obliquely beneath the tendon of the flexor pollicis longus to join the lateral portion of the flexor brevis and the abductor pollicis brevis. The flexor digitorum profundus muscle originates from the ulna, which is the long bone on the pinkyside of the forearm. Anatomical variations of the deep head of cruveilhier of the. Its possible role in anterior interosseous syndrome is. Origin lower third of posterior shaft of radius and adjacent interosseous membrane.
It originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from the tubercle of the trapezium. The flexor pollicis longus muscle is located in the lower half of the arm, from the elbow down. Illustrated anatomical parts with images from eanatomy and descriptions of anatomical structures. The flexor pollicis brevis is a thin, two headed muscle lying medially from the opponens pollicis, beneath the abductor pollicis brevis and above the adductor pollicis.
The structure indicated is the flexor pollicis brevis muscle of the hand the flexor pollicis brevis muscle is one of the intrinsic muscles of the hand that belongs to the thenar group the thenar group of intrinsic hand muscles consist of three muscles abductor pollicis brevis. Exercises to strengthen the abductor pollicis brevis muscle. Posterior interosseous artery the medical illustrations contained in this online atlas are. Jul 09, 2015 check out this short video on the anatomy of the flexor pollicis longus muscle, including its origin, insertion, innervation and function. Meaning of flexor pollicis brevis muscle medical term. The flexor pollicis longus or flexor pollicis longus muscle, latin. Flexor pollicis brevis muscle definition of flexor. Flexor pollicis longus muscle wikimili, the best wikipedia. Abductor pollicis longus is known for its variations in the form of multiple tendons at its insertion. The flexor pollicis longus is a flexor of the phalanges of the thumb. The muscles superficial head arises from the distal edge of the flexor retinaculum and the tubercle of the trapezium, the most lateral. Together with the abductor pollicis muscle, the opponens pollicis and flexor pollicis muscles that form the thenar eminence, play an important role in hand functions, especially for fine motor functions of the thumb. Originates from the posterior surface of the radius and interosseous membrane. The standard anatomical description of the extensor pollicis brevis epb found in current anatomical textbooks describes its origin as the posterior surface of the radius and the adjacent part of the interosseous membrane, distal to the attachment of the abductor pollicis longus apl.
742 112 1343 1397 1309 1081 1148 196 332 1281 1146 907 1207 506 1545 1586 1281 81 331 128 1625 1162 1324 14 468 1098 1521 113 1152 724 1193 1246 525 726 674 555 469 190 119 57