Posterior interosseous nerve

Information about Posterior interosseous nerve

Nerve:
The Supinator. (Dorsal interosseous nerve labeled at right.)
Latinnervus interosseus antebrachii posterior
subject #210 944
Fromdeep branch of the radial nerve
Dorlands/Elsevier n_05/12565987
After crossing the supinator muscle, the deep branch of the radial nerve, considerably diminished in size, descends as the posterior interosseous nerve (or dorsal interosseous nerve), on the interosseous membrane, in front of the Extensor pollicis longus, to the back of the carpus, where it presents a gangliform enlargement from which filaments are distributed to the ligaments and articulations of the carpus.

It supplies all the muscles on the radial side and dorsal surface of the forearm, excepting the Anconæus, Brachioradialis, and Extensor carpi radialis longus.

See also

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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 As such, some of the information contained herein may be outdated.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.

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Nerves of upper limbs (primarily): the brachial plexus
Supraclaviculardorsal scapular • suprascapular • to the subclavius • long thoracic
Infraclavicular: lateral cordmusculocutaneous (lateral cutaneous of forearm) • lateral pectoral • lateral head of median (anterior interosseous, palmar, common palmar digital, proper palmar digital)
Infraclavicular: medial cordmedial pectoral • medial cutaneous of forearm • medial cutaneous of arm • ulnar (muscular branches, dorsal branch, palmar branch, superficial branch, deep branch) • medial head of median
Infraclavicular: posterior cordsubscapular (upper, lower) • thoracodorsal • axillary (superior lateral cutaneous of arm) • radial (muscular, inferior lateral cutaneous of arm, posterior cutaneous of arm, posterior cutaneous of forearm, superficial branch, deep branch, posterior interosseous)
Othercutaneous innervation of the upper limbs
Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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The deep branch of the radial nerve winds to the back of the forearm around the lateral side of the radius between the two planes of fibers of the Supinator, and is prolonged downward between the superficial and deep layers of muscles, to the middle of the forearm.
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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The Supinator is a broad muscle, curved around the upper third of the radius.

Origin and insertion

It consists of two planes of fibers, between which the deep branch of the radial nerve lies.
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The deep branch of the radial nerve winds to the back of the forearm around the lateral side of the radius between the two planes of fibers of the Supinator, and is prolonged downward between the superficial and deep layers of muscles, to the middle of the forearm.
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An interosseous membrane is a broad and thin plane of fibrous tissue that separates many of the bones of the body. It is an important component of many joints.

Interosseous membranes in the human body:
  • Interosseous membrane of the forearm

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The Extensor pollicis longus is much larger than the Extensor pollicis brevis muscle, the origin of which it partly covers.

Origin and insertion

It arises from the lateral part of the middle third of the dorsal surface of the body of the ulna below the origin of the
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carpus is the cluster of bones in the hand between the radius and ulna and the metacarpus. The bones of the carpus do not belong to individual fingers, whereas those of the metacarpus do. The joint between the radius and ulna and the carpus is called the wrist.
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The anconeus muscle is a small muscle on the posterior aspect of the elbow joint.

Some consider anconeus to be a continuation of the triceps brachii muscle.[1][2][3]
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Brachioradialis is a muscle of the forearm that acts to flex the forearm at the elbow. It is also capable of both pronation and supination, depending on the position of the forearm.
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Extensor carpi radialis longus is one of the five main muscles that control movement at the wrist. This muscle is quite long, starting on the lateral side of the humerus, and attaching to the base of the 2nd metacarpal.
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The anterior interosseous nerve (volar interosseous nerve) is a branch of the median nerve that supplies the deep muscles on the front of the forearm, except the ulnar half of the flexor digitorum profundus.
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eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely, two medical doctors. It was sold to WebMD in January 2006.
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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A nerve is an enclosed, cable-like bundle of axons (the long, slender projection of a neuron). Neurons are sometimes called nerve cells, though this term is technically imprecise since many neurons do not form nerves, and nerves also include the glial cells that
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In human anatomy, the upper limb (also upper extremity) refers to what in common English is known as the arm, that is, the region of the shoulder to the fingertips. It includes the entire limb, and thus, is not synonymous with the term upper arm.
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The brachial plexus is an arrangement of nerve fibres, running from the spine, specifically from above the fifth cervical vertebra to underneath the first thoracic vertebra (C5-T1). It proceeds through the neck, the axilla (armpit region) and into the arm.
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The dorsal scapular nerve arises from the brachial plexus, usually from the plexus root (anterior ramus) of C5.

It provides motor innervation to the rhomboid muscles, which pull the scapula towards the spine and levator scapulae muscle, which elevates the scapula.
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The suprascapular nerve arises from the trunk formed by the union of the fifth and sixth cervical nerves. It innervates the supraspinatus muscles and infraspinatus muscles.
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The Nerve to the Subclavius (or subclavian nerve) is a small filament, which arises from the point of junction of the fifth and sixth cervical nerves; it descends to the subclavius muscle in front of the third part of the subclavian artery and the lower trunk of the plexus,
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The long thoracic nerve (external respiratory nerve of Bell; posterior thoracic nerve) supplies the Serratus anterior. This nerve characteristically arises by three roots from the fifth, sixth, and seventh cervical nerves (C5-C7) but the root from C7 may be absent.
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The Lateral cord is a division of the brachial plexus.

The lateral cord gives rise to the following nerves:
  • The lateral pectoral nerve, C5, C6 and C7 to the pectoralis major muscle
  • The musculocutaneous nerve which innervates the biceps muscle

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The musculocutaneous nerve arises from the lateral cord of the brachial plexus, opposite the lower border of the Pectoralis minor, its fibers being derived from the fifth, sixth, and seventh cervical nerves.
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The lateral antebrachial cutaneous nerve (or lateral cutaneous nerve of forearm) (branch of musculocutaneous nerve, also sometimes spelled "antebrachial") passes behind the cephalic vein, and divides, opposite the elbow-joint, into a volar and a dorsal branch.
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The lateral pectoral nerve (lateral anterior thoracic) arises from the lateral cord of the brachial plexus, and through it from the fifth, sixth, and seventh cervical nerves.
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The median nerve is a nerve that runs down the arm and forearm. It is one of the five main nerves originating from the brachial plexus.

The median nerve is formed from parts of the medial and lateral cords of the brachial plexus, and continues down the arm to enter the
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The anterior interosseous nerve (volar interosseous nerve) is a branch of the median nerve that supplies the deep muscles on the front of the forearm, except the ulnar half of the flexor digitorum profundus.
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The palmar branch of the median nerve arises at the lower part of the forearm.

It pierces the volar carpal ligament, and divides into a lateral and a medial branch;
  • The lateral branch

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Common palmar digital nerves (common volar digital nerves).
  • The first of these gives a twig to the second Lumbricalis and runs toward the cleft between the index and middle fingers, where it divides into two proper digital nerves for the adjoining sides of these

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