flexor forearm

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Author:
jtsterner
ID:
3176
Filename:
flexor forearm
Updated:
2009-12-15 17:53:54
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flexor forearm
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Description:
Origin, Insertion, Innervation & Function
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  1. Flexor Carpi Ulnaris
    O -Humeral head-common flexor tendon off the medial epicondyle of humerus; ulnar head-olecranon & posterior border of ulna

    I -Pisoform bone, and then via pisohamate & pisometacarpal ligaments onto the hamate & base of metacarpal V

    In -Median n. [C7-T1]

    F -Flexes & adducts the wrist
  2. Pronator Teres
    O -Humeral head-common flexor tendon off the medial epicondyle of humerus & adjacent supraepicondylar ridge; ulnar head-medial side of coronoid process

    I -Roughening on lateral surface, midshaft of radius

    In -Median n. [C6-C7]

    F -Pronation
  3. Flexor Carpi Radialis
    O -Common flexor tendon off the medial epicondyle of humerus

    I -Base of metacarpals II and III

    In -Median n. [C6,C7]

    F -Flexes & abducts the wrist
  4. Palmaris Longus
    O -Common flexor tendon off the medial epicondyle of humerus

    I -Palmar aponeurosis of the hand

    In -Median n. [C7,C8]

    F -Flexes wrist joint; b/c the palmar aponeurosis anchors skin of the hand, contraction of the muscle resists shear forces when gripping
  5. Pronator Quadratus
    O -Linear ridge on distal anterior surface of ulna

    I -Distal anterior surface of radius

    In -Median n. (anterior interosseus n.) [C7,C8]

    F -Pronation
  6. Flexor Pollicis Longus
    O -Anterior surface of radius & radial half of interosseous membrane

    I -Palmar surface of base of distal phalanx of thumb

    In -Median n. (anterior interosseous n.) [C7,C8]

    F -Flexes interphalangeal joint of the thumb; can also flex metacarpophalangeal joint of the thumb
  7. Flexor Digitorum Profundus
    O -Anterior & medial surface of ulna & anterior medial half of interosseous membrane

    I -Four tendons, which attach to the palmar surfaces of the distal phalanges of the index, middle, ring & little fingers

    In -Lateral half by Median n. (anterior interosseous n.); medial half by Ulnar n. [C8,T1]

    F -Flexes distal interphalangeal joints of the index, middle, ring & little fingers; can also flex metacarpophalangeal joints of the same fingers and the wrist joint
  8. Flexor Digitorum Superficialis
    O -Humero-ulnar head-common flexor tendon off the medial epicondyle of humerus & adjacent margin of coronoid process; radial head-oblique line of radius

    I -Four tendons, which attach to the palmar surfaces of the middle phalanges of the index, middle, ring & little fingers

    In -Median n. [C8,T1]

    F -Flexes proximal interphalangeal joints of the index, middle, ring & little fingers; can also flex metacarpophalangeal joints of the same fingers & the wrist joint
  9. Palmar Interossei
    O -Side of metacarpals

    I -Extensor hoods of thumb, index, ring & little fingers and the proximal phalanx of the thumb

    In -Deep branch of Ulnar n. [C8,T1]

    F -Adduction of thumb, index, ring & little fingers at the metacarpophalangeal joints
  10. Dorsal Interossei
    O -Adjacent sides of metacarpals

    I -Extensor hoods and base of proximal phalanges of index, middle & ring fingers

    In -Deep branch of Ulnar n. [C8,T1]

    F -Abduction of index, middle & ring fingers at the metacarpophalangeal joints
  11. Adductor Pollicis
    O -Transverse head-metacarpal III; oblique head-capitate & bases of metacarpals II & III

    I -Base of proximal phalanx & extensor hood of thumb

    In -Deep branch of Ulnar n. [C8,T1]

    F -Adducts thumb
  12. Abductor Digiti Minimi
    O -Pisiform, the pisohamate ligament & tendon of flexor carpi ulnaris

    I -Proximal phalanx of little finger

    In -Deep branch of Ulnar n. [C8,T1]

    F -Abducts little finger at metacarpophalangeal joint
  13. Opponens Digiti Minimi
    O -Hook of hamate & flexor retinaculum

    I -Medial aspect of metacarpal

    In -Deep branch of Ulnar n. [C8,T1]

    F -Laterally rotates metacarpal V
  14. Flexor Digiti Minimi Brevis
    O -Hook of hamate & flexor retinaculum

    I -Proximal phalanx of little finger

    In -Deep branch of Ulnar n. [C8,T1]

    F -Flexes little finger at metacarpophalangeal joint
  15. Abductor Pollicis Brevis
    O -Tubercles of scaphoid & trapezium & adjacent flexor retinaculum

    I -Proximal phalanx & extensor hood of thumb

    In -Recurrent branch of Median n. [C8,T1]

    F -Abducts thumb at metacarpophalangeal joint
  16. Flexor Pollicis Brevis
    O -Tubercle of trapezium & flexor retinaculum

    I -Proximal phalanx of thumb

    In -Recurrent branch of Median n. [C8,T1]

    F -Flexes thumb at metacarpophalangeal joint
  17. Opponens Pollicis
    O -Tubercle of trapezium & flexor retinaculum

    I -Lateral margin & adjacent palmar surface of metacarpal I

    In -Recurrent branch of Median n. [C8,T1]

    F -Medially rotates thumb
  18. Lumbricals (4 muscles)
    O -Tendons of flelxor digitorum profundus

    I -Extensor hoods of index, middle, ring & little fingers

    • In -Medial two by the deep branch of the ulnar nerve; lateral two by digital
    • branches of the median nerve

    F -Flex metacarpophalangeal joints while extending interphalangeal joints

    • 1st & 2nd (medial)
    • O -One flexor tendon and are unipennate

    • 3rd & 4th (lateral)
    • O -Two flexor tendons and are bipennate

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