These tendons run closer to the bone compared to the rest of the flexors in the hand and fingers. Learn more about flexor tendon injuries. EDC tendons straighten the index, middle, ring and small fingers. A common muscle belly is shared by all the fingers.
The tendons travel down the forearm through a tough band of tissue on top of the wrist. The band of tissue, or retinaculum, holds the tendons in place but allows them to slide up and down the arm. The four tendons then continue along the back of the hand and onto each finger. In the finger, the ends of other tendons that start in the hand join with them to make the fingers move.
Together, these combined tendons extend the fingers at the three finger joints. The EDM straightens the small finger. It works with the extensor digitorum communis to the small finger. The muscle belly is in the forearm. The tendon travels through a tough band or retinaculum at the wrist and then into the hand. It works with other tendons that attach to the dorsum or back of the finger to straighten the three small finger joints. The EIP tendon straightens the index finger.
It works with the extensor digitorum communis to the index finger. It has its own muscle belly in the forearm and then, as it becomes a tendon, it travels through a tough band, or retinaculum, in the wrist.
It travels down the hand and attaches to the back of the index finger to straighten the three index finger joints. The APL tendon runs on the radial side of the wrist the side the thumb is on. Its muscle belly is in the forearm and then travels inside a tough band, or retinaculum, across the wrist. It attaches to the metacarpal bone of the thumb and helps pull the thumb away from the rest of the hand.
This tendon along with the extensor policies brevis tendon can get inflamed and painful. The FPL tendon bends the thumb. It is unique to humans. It starts as a muscle in the forearm and then travels as a tendon in the wrist through the carpal tunnel. It is then covered by a tunnel, or sheath, and inserts into the most distal farthest from your body bone in the thumb.
The EPL straightens the most distal farthest from your body joint of the thumb. Its muscle belly is in the forearm and the tendon travels along the wrist and enters the third compartment of the band that holds the tendons in position at the wrist. It then travels around a prominent part of the radius bone that acts like a pulley. The tendon then attaches to the most distal bone in the thumb. The EPB tendon is in the forearm and then runs along the radial side of the wrist.
This tendon also travels in the first compartment of the band that holds the tendons in position at the wrist. The FCR tendon is one of two tendons that bend the wrist. Its muscle belly is in the forearm and then travels along the inside of the forearm and crosses the wrist. It attaches to the base of the second and third hand bones. It also attaches to the one of the wrist bones, the trapezium. The FCU tendon is one of two tendons that bend the wrist.
Its muscle belly is in the forearm. The tendon travels along the inside of the forearm on the side of the small finger and crosses the wrist. It attaches to the wrist bone, the pisiform, and as well as the 5th hand bone. The palmaris longus tendon is a tendon with very little function in the hand. About one fourth of the population does not have this tendon. The rest have varying sizes of this tendon. It travels into the wrist and joins the fascia in the palm.
This tendon is often used to repair other tendons. Its muscle belly is in the forearm and then travels to the thumb side of the wrist on the back part of the forearm. Log In. Sign Up. Become a Gold Supporter and see no ads. Log in Sign up. Articles Cases Courses Quiz. About Recent Edits Go ad-free.
Edit article. View revision history Report problem with Article. Citation, DOI and article data. Knipe, H. Extensor compartments of the wrist. Reference article, Radiopaedia. URL of Article. The extensor tendons at the level of the wrist are divided into six extensor compartments that are designated by Roman numerals from lateral to medial 1 : I : extensor pollicis brevis , abductor pollicis longus II : extensor carpi radialis longus , extensor carpi radialis brevis III : extensor pollicis longus compartments 2 and 3 are divided by Lister's tubercle of the distal radius IV : extensor digitorum , extensor indicis V : extensor digiti minimi VI : extensor carpi ulnaris runs in the groove of the ulnar head.
MR imaging of the wrist: normal findings that may simulate disease. Radiographics abstract - Pubmed citation. Related articles: Anatomy: Upper limb.
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