Which structures prevent the tendons of the extrinsic hand muscles from bowing

]It is supplied by the median nerve.Flexor digitorum profundus lies deep to the superficialis, but it attaches more distally. One part is attached to the lateral side of the base of the first metacarpal and other to the trapezium.  Fasciculi may be sent to the opponens pollicis, or with the abductor pollicis brevis.Flexor pollicis longus flexes interphalangeal joint of the thumb. )(Redrawn after McCarthy JG. Comments are closed for this page. Atlas of Hand Surgery, vol 1.

Philadelphia: WB Saunders, 1990. There are two gluteal regions, left and right. [see the image below]The palmar aponeurosis represents the distal part of the tendon of the palmaris longus.The flexor digitorum superficialis is the main flexor of the proximal interphalangeal joints. flashcards from Lydia Tang's class online, or in Brainscape's iPhone or Android app. It is lodged between the lateral head of the flexor pollicis brevis and the oblique part of the adductor pollicis and is inserted into the base of the distal phalanx of the thumb.Actions are similar to those of extensor carpi radials longus.Medial side of the base of the proximal phalanx of the thumb. In the axial plane, various ligaments and tendons are shown in cross sections; their anatomic relationship to the bone structures, arteries, and nerves can be evaluated effectively . Medial attachments are the styloid process of the ulna, the triquetral, and the pisiform bones.The four tendons of the extensor digitorum emerge from under of the extensor retinaculum and fan out over the dorsum of the hand.It helps in gripping by marking the hypothenar eminence more prominent, and by wrinkling the skin over it.The dorsal digital expansion is a small triangular aponeurosis covering the dorsum of the proximal phalanx with its base at the metacarpophalangeal joint. )of hyperextension. Philadelphia: WB Saunders, 2001.

Wrist muscles originate proximally and travel along extrinsic muscles of the hand and are considered together.Each muscle is inserted into the dorsal digital expansion of one digit. The collateral ligaments of the distal interphalangeal joints are simply thickened medial and lateral portions of the joint capsule. Learn faster with spaced repetition. Atlas of Hand Surgery, vol. Wrist muscles originate proximally and travel along extrinsic muscles of the hand and are considered together. Lower medial end is continuous with the digital synovial sheath of the little finger.The posterior surface of the ulna below the origin of the extensor pollicis longus and from the interosseous membrane.The retinaculum sends down septa which are attached to the longitudinal ridges on the posterior surface of the lower end of radius to create six osteofascial compartments are formed on the back of the wrist [The cross-sectional image below would explain better] It provides the main gripping power of the hand.These are four small muscles placed between the shafts of the metacarpal bones. ]Flexor carpi radialis originates from the medial epicondyle of the humerusThe extensor retinaculum or dorsal carpal ligament is formed by thickened fascia at the neck of the wrist. It is also known by the name of Albers-Schönberg disease. )(Redrawn after Chase RA. Deficit in the abdominal … This is a combination of flexion and medial rotation.Superficial  head originates  fromIt passes downward and laterally and is inserted into the whole length of the metacarpal bone of the thumb on its radial side.This muscle originates from common extensor origin and radial collateral ligament of the elbowThe tendon passes through a separate compartment of the extensor retinaculum, behind the radioulnar joint.The transverse head arises from the palmar protect of the third metacarpal bone.Dorsal aspect of bases of second and third metacarpal bones.Osteopetrosis is also called stone bone or marble bone disease.
Philadelphia: WB Saunders, 1973.)

Anatomy of the thumb. The musculotendinous junctions are found proximal to the proximal edge of the CT. Study KEY NOTES CHAPTER 5: UPPER LIMB - Embryology and Congenital Deformities. Extrinsic Muscles of Hand and Wrist. Anterolateral bowing occurs in neurofibromatosis and […]Each compartment is lined by a synovial sheath which is reflected on the contained tendons.This muscle is superficial and lies just under the skin.Sometimes, it gets a slip from medial epicondyle of the humerus.Hand contains 20 muscles as follows.The posterolateral corners of the extensor expansion are joined by tendons of the interossei and of a lumbrical muscle.The muscle fans out into four tendons (one to each of the second to the fifth digit) to the palmar base of the distal phalanx.From flexor retinaculum and palmar aponeurosis.The tendons enter the hand by passing deep to the flexor retinaculum within the common synovial sheath. List the structures that are attached distally and superiorly to the palmar aponeurosis (palmar fascia). An … In approximate terms, it can be called the area of buttocks. The mobile metacarpal heads are pulled dorsally by extrinsic extensor tendons when the thenar and hypothenar muscles relax. profundus superficialis. )(From McCarthy JG. Philadelphia: WB Saunders, 1990. All of them are supplied by the radial nerve.The extensor digitorum and the extensor indicis [described later] pass through the same compartment of the extensor retinaculum and have a common synovial sheath.The tendon to the index finger is joined its medial side by the tendon of the extensor indicis, and the tendon to the little finger is joined on its medial side by the two tendons of the extensor digiti minimi.Superficial head is supplied by the median nerve and the deep head by the deep branch of the ulnar nerve.Extension of the little finger at the interphalangeal and metacarpophalangeal joints.It attaches laterally, to the lower part of the anterior border of the radius. Edinburgh: Churchill Livingstone, 1989.

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