Extensor indicis proprius

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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.

Contents 1 Origin and insertion 2 Action 3 Additional images 4 External links

[edit] 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.

[edit] Action

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

[edit] Additional images

Bones of left forearm. Posterior aspect.

Posterior surface of the forearm. Deep muscles.

Transverse section across the wrist and digits.

[edit] External links

• LUC exi
• SUNY Labs 09:05-0106 - "Extensor Region of Forearm and Dorsum of Hand: Deep Muscles of Extensor Region"
• Norman/Georgetown lesson5musofpostforearm
• Duke Orthopedics extensor_indicis
• Dictionary at eMedicine Extensor+indicis+muscle

v • d • e Muscles of upper limbs

VERTEBRAL COLUMN: trapezius - latissimus dorsi - rhomboid major - rhomboid minor - levator scapulae ANTERIOR AND LATERAL 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 - abductor pollicis brevis - thenar (opponens pollicis, flexor 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.