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FLEXOR CARPI RADIALIS
ORIGIN: The medial epicondyle of the humerus and the medial border of the radius
INSERTION: The palmar side of the base of metacarpals II and III
ACTION: To flex the carpus
INNERVATION: Median nerve
SUPERFICIAL DIGITAL FLEXOR
ORIGIN: The medial epicondyle of the humerus
INSERTION: The palmar surface of the base (proximal end) of the middle phalanges of digits II, III, IV, and V
ACTION: To flex the carpal, metacarpophalangeal, and proximal interphalangeal joints of digits II, III, IV, and V
INNERVATION: Medial nerve
FLEXOR CARPI ULNARIS:
- ULNAR HEAD
- HUMERAL HEAD
ORIGIN: Ulnar head- the caudal border and medial surface of the olecranon; humeral head- the medial epicondyle of the humerus
INSERTION: The accessory carpal bone
INNERVATION: Ulnar nerve
DEEP DIGITAL FLEXOR:
- RADIAL HEAD
ORIGIN: Humeral head - the medial epicondyle of the humerus, ulnar head - the proximal three fourths of the caudal border of the ulna; radial head - the middle third of the medial border of the radius
INSERTION: The flexor tubercle on the palmar surface of the distal phalanx of each digit
ACTION: To flex the carpal and metacarpophalangeal joints and the proximal and distal interphalangeal joints of the digit
INNERVATION: Median and ulnar nerves
FLEXOR MANICA
At the metacarpophalangeal joint, it lies around the deep flexor tendon that passes through it forming a collar
DIGITAL SYNOVIAL SHEATH
The superficial flexor tendons are in a common synovial membrane called the digital synovial sheath
PALMAR ANNULAR LIGAMENT
It firmly holds the superficial and deep digital flexor tendons in place at the metacarpophalangeal joint. It crosses the flexor manica.
FLEXOR RETINACULUM
The three tendons of the deep digital flexor (humeral head, ulnar head, radial head) all fuse to form a single tendon. This tendon is held in place in the carpal canal by the thick, deep part of the fibrous flexor retinaculum
ANNULAR DIGITAL LIGAMENTS
It supports the deep digital flexor tendon proximal and distal to the palmar surface of the proximal interphalangeal joint
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