Flexor digitorum profundus muscle

The flexor digitorum profundus is a muscle in the forearm of humans that flexes the fingers (also known as digits). It is considered an extrinsic hand muscle because it acts on the hand while its muscle belly is located in the forearm.Front of the left forearm. Deep muscles.Cross-section through the middle of the forearm.Posterior surface of the forearm. Deep muscles.Transverse section across distal ends of radius and ulna.Transverse section across the wrist and digits.The mucous sheaths of the tendons on the front of the wrist and digits.Ulnar and radial arteries. Deep view.Tendons of forefinger and vincula tendina. (Flexor digitorum profundus labeled at bottom right.)Flexor digitorum profundus muscleFlexor digitorum profundus muscleFlexor digitorum profundus muscleFlexor digitorum profundus muscleFlexor digitorum profundus muscleFlexor digitorum profundus muscleFlexor digitorum profundus muscleFlexor digitorum profundus muscleFlexor digitorum profundus muscle The flexor digitorum profundus is a muscle in the forearm of humans that flexes the fingers (also known as digits). It is considered an extrinsic hand muscle because it acts on the hand while its muscle belly is located in the forearm. Together the flexor pollicis longus, pronator quadratus, and flexor digitorum profundus form the deep layer of ventral forearm muscles. The muscle is named from Latin, meaning 'deep bender of the fingers'. Flexor digitorum profundus originates in the upper 3/4 of the anterior and medial surfaces of the ulna, interosseous membrane and deep fascia of the forearm. The muscle fans out into four tendons (one to each of the second to fifth fingers) to the palmar base of the distal phalanx. Along with the flexor digitorum superficialis, it has long tendons that run down the arm and through the carpal tunnel and attach to the palmar side of the phalanges of the fingers. Flexor digitorum profundus lies deep to the superficialis, but it attaches more distally. Therefore, profundus's tendons go through the tendons of superficialis, and end up attaching to the distal phalanx. For this reason profundus is also called the perforating muscle. The lumbricals of the hand arise from the radial side of its tendons. Flexor digitorum profundus is a composite muscle innervated by the anterior interosseous nerve and ulnar nerves. It is one of two flexor muscles that is not exclusively supplied by the median nerve (the other is flexor carpi ulnaris). The tendon of the index finger often has a separate muscle belly.