Extensor indicis proprius

Extensor indicis proprius

Transverse section across distal ends of radius and ulna. (Label "Ext. indic. prop." visible at bottom center.)

The mucous sheaths of the tendons on the back of the wrist. (Extensor indicis proprius visible going into second digit.)
Latin	musculus extensor indicis
Gray's	subject #125 456
Origin:	ulna
Insertion:	index finger (extensor hood)
Artery:
Nerve:	posterior interosseous nerve
Action:	extends index finger, wrist
Dorlands/Elsevier	m_22/12548933

The extensor indicis proprius (Extensor indicis) is a narrow, elongated muscle, placed medial to, and parallel with, the extensor pollicis longus.

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Origin and insertion

It arises, from the dorsal surface of the body of the ulna below the origin of the Extensor pollicis longus, and from the interosseous membrane.

Its tendon passes under the dorsal carpal ligament in the same compartment as that which transmits the tendons of the Extensor digitorum communis, and opposite the head of the second metacarpal bone, joins the ulnar side of the tendon of the Extensor digitorum communis which belongs to the index finger.

Action

The Extensor indicis proprius extends the index finger, and by its continued action assists in extending the wrist.

Additional images

v • d • e List of muscles of upper limbs
VERTEBRAL COLUMN	trapezius - latissimus dorsi - rhomboid (major, minor) - levator scapulae
THORACIC WALLS	pectoralis major - pectoralis minor - subclavius - serratus anterior
SHOULDER	deltoid - rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) - teres major
ARM	anterior compartment: coracobrachialis - biceps brachii - brachialis posterior compartment: triceps brachii - anconeus
FOREARM	anterior compartment: super. - pronator teres - palmaris longus - flexor carpi radialis - flexor carpi ulnaris - flexor digitorum superficialis - deep - pronator quadratus - flexor digitorum profundus - flexor pollicis longus posterior compartment: super. - mobile wad (brachioradialis, extensor carpi radialis longus and brevis) - extensor digitorum, - extensor digiti minimi - extensor carpi ulnaris - deep - supinator - anatomical snuff box (abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus) - extensor indicis
HAND	lateral volar - thenar (opponens pollicis, flexor pollicis brevis, abductor pollicis brevis, adductor pollicis) medial volar - palmaris brevis - hypothenar (abductor minimi digiti, flexor digiti minimi brevis, opponens digiti minimi) intermediate - lumbrical - dorsal interossei - palmar interossei

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

Category: Muscles of the upper limb

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Extensor_indicis_proprius". A list of authors is available in Wikipedia.