Transcript Posterior interosseous nerve

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In two layers:
a superficial layer
a deep layer.
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Brachioradialis
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris
Extensor digitorum
Extensor digiti minimi
Anconeus
Common origin lateral
epicondyle of the humerus
Except for the
brachioradialis and
anconeus, extend as
tendons into the hand.
Lateral epicondyle
Lateral
of humerus
epicondyle of
Proximal part of
humerus
supraepicondylar
ridge
of
Distal
part
of supraepicondylar
Lateral
epicondyle
of
Lateral
Lateral
epicondyle
epicondyle
of of
humerus
ridge
of
humerus
humerus
humerus
humerus
commonextensor
extensororigin
origin
Extensor
common
expansion
Olecranon and proximal
(hood) of
posterior
surface
of
ulna
dorsal aspects of the
the 5th digit
bases of the middle
and distal phalanges of
Lateral
surface
distal
the
medial
four of
digits
Base
of
end of radius
proximal
Base
Base
of3rd
5th
of 2nd
th
metacarpal
Base
Base
2nd
the
metacarpal
5metacarpal
Base
ofofof
3rd
metacarpal
to
styloid
process
metacarpal
metacarpals
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Supinator
Abductor pollicis longus
Extensor pollicis longus
Extensor pollicis brevis
Extensor indicis
Posterior surface of middle third of ulna and
interosseous membrane
Dorsal surface of base of distal phalanx of thumb
Posterior surface of distal third of radius and
interosseous membrane
Dorsal surface of base of proximal phalanx of the
thumb
Posterior
of
Superficial
(humeroulnar)
Posterior
surfacesurface
ofhead
proximal
distal
1/3
of
•lateral
epicondyle
of ulna
halves
of ulna,
radius,
and
and interosseous
humerus
interosseousmembrane
membrane
•radial collateral
and anular
ligaments
Deep (ulnar) head
Supinator crest of the ulna
Base of 1st
metacarpal
Lateral surface of radius
Extensor
superior to the
anterior
oblique line expansion
(hood) of 2nd
digit
Except for the supinator muscle, all these deep layer muscles originate from the
posterior surfaces of the radius, ulna, and interosseous membrane and pass into
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the thumb and fingers.
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Brachioradialis
Extensor carpi radialis longus
Radial nerve (Main nerve)
Supinator
Extensor carpi radialis brevis
Deep branch of radial nerve
Rest
Posterior interosseous nerve
continuation of deep branch of
radial nerve
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Radial artery
Posterior interosseous
artery
origin:
common interosseous branch of
the ulnar artery
recurrent interosseous artery
End by joining to dorsal
carpal arch of the wrist
Anterior interosseous
artery
origin:
common interosseous branch of
the ulnar artery
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Deep branch becomes posterior interosseous nerve
after emerging from between 2 heads of supinator
Posterior interosseous nerve
passes deep to extensor pollicis longus to reach
the wrist.
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