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Information about Extensor Pollicis Longus

Extensor pollicis longus muscle
The mucous sheaths of the tendons on the back of the wrist. (Extensor pollicis longus visible at center right.)
Latinmusculus extensor pollicis longus
subject #125 455
Origin:ulna
Insertion:thumb, distal phalanx
Artery:
Nerve:posterior interosseus nerve (branching from the radial nerve)
Action:extension of the thumb (metacarpophalangeal and interphalangeal)
Antagonist:Flexor pollicis longus muscle, Flexor pollicis brevis muscle
Dorlands/Elsevier m_22/12548955
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 Abductor pollicis longus, and from the interosseous membrane.

It ends in a tendon, which passes through a separate compartment in the dorsal carpal ligament, lying in a narrow, oblique groove on the back of the lower end of the radius.

It then crosses obliquely the tendons of the Extensores carpi radialis longus and brevis, and is separated from the Extensor brevis pollicis by a triangular interval, the anatomical snuff box in which the radial artery is found; and is finally inserted into the base of the last phalanx of the thumb.

Relations

The radial artery is crossed by the tendons of the Abductor pollicis longus and of the Extensores pollicis longus and brevis.

Action

The extends the proximal phalanx, and the

Extensor pollicis longus extends the terminal phalanx of the thumb; in combination with the Extensor pollicis brevis, it helps to extend and abduct the wrist.

Additional images


Anatomical snuff box

Bones of left forearm. Posterior aspect.

Bones of the left hand. Dorsal surface.

Tendons of forefinger and vincula tendina.

Cross-section through the middle of the forearm.

Posterior surface of the forearm. Superficial muscles.

Posterior surface of the forearm. Deep muscles.

Transverse section across the wrist and digits.

Arteries of the back of the forearm and hand.


External links

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 As such, some of the information contained herein may be outdated.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.
 •  • [ e]
Muscles of upper limbs
VERTEBRAL COLUMNtrapezius - latissimus dorsi - rhomboid major - rhomboid minor - levator scapulae
THORACIC WALLSpectoralis major - pectoralis minor - subclavius - serratus anterior
SHOULDERdeltoid - rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) - teres major
ARManterior compartment: coracobrachialis - biceps brachii - brachialis
posterior compartment: triceps brachii - anconeus
FOREARManterior 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
HANDlateral 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
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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bold refer to the diagram at right.)

In the skull (8):
  • 1-9. cranium
  • 7. mandible
''In the middle ears (6):
  • malleus
  • incus
  • stapes
In the throat (1):
  • hyoid
In the shoulder girdle (4):
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The ulna (elbow bone) is a long bone, prismatic in form, placed at the medial side of the forearm, parallel with the radius.

Articulations

The ulna articulates with:
  • the humerus, at the right side elbow as a hinge joint.

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bold refer to the diagram at right.)

In the skull (8):
  • 1-9. cranium
  • 7. mandible
''In the middle ears (6):
  • malleus
  • incus
  • stapes
In the throat (1):
  • hyoid
In the shoulder girdle (4):
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The thumb is one of the five fingers.

Anatomy of the thumb

Bones

The thumb consists of 3 bones:
  • distal phalanx (of the first digit)
  • proximal phalanx (of the first digit)
  • first metacarpal

Muscles


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Distal phalanges (single distal phalanx) are bones found in the limbs of most vertebrate skeletons. In humans, they are the finger bones located furthest from the shoulder joint, and the toe bones located furthest from the hip.
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Arteries are muscular blood vessels that carry blood away from the heart.[1] All arteries, with the exception of the pulmonary and umbilical arteries, carry oxygenated blood.

The circulatory system is extremely important for sustaining life.
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  • Accessory nerve
  • Accessory obturator nerve
  • Alderman's nerve
  • Anococcygeal nerve
  • Ansa cervicalis
  • Anterior interosseous nerve
  • Anterior superior alveolar nerve
  • Aortic plexus
  • Auerbach's plexus
  • Auriculotemporal nerve
  • Axillary nerve

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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
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The radial nerve is a nerve in the human body that supplies the triceps brachii muscle of the arm, as well as all 12 muscles in the posterior osteofascial compartment of the forearm.
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Kinesiology is the scientific study of the anatomy, physiology, and mechanics of body movement, especially in humans. [1] The word kinesiology is derived the Greek "kinesis" (motion) + the suffix -ology or -logy from the greek "logos" or "logia"(meaning a field of study).
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Extension is a movement of a joint. For example, extension is produced by extending the flexed elbow. The arm is now straight; it has been extended. If the head is tilted all the way back, it is said to be extended.

The movement in the opposite directions is called flexion.
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The thumb is one of the five fingers.

Anatomy of the thumb

Bones

The thumb consists of 3 bones:
  • distal phalanx (of the first digit)
  • proximal phalanx (of the first digit)
  • first metacarpal

Muscles


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The metacarpophalangeal joints (MCP) are of the condyloid kind, formed by the reception of the rounded heads of the metacarpal bones into shallow cavities on the proximal ends of the first phalanges, with the exception of that of the thumb, which presents more of the characters
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Interphalangeal (between the phalanges) can refer to:
  • Interphalangeal articulations of hand
  • Interphalangeal articulations of foot

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An antagonist is a kind of muscle that acts in opposition to the movement generated by the agonist and is responsible for returning a limb to its initial position.

Antagonistic pairs in houses

These antagonistic muscles are found in pairs called antagonistic pairs.
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The flexor pollicis longus is a muscle in the forearm and hand that flexes the thumb. It lies in the same plane as the flexor digitorum profundus.

Origin and insertion


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The flexor pollicis brevis is a muscle in the hand that flexes the thumb. It is one of three thenar muscles. It has both a superficial part and a deep part.

The superficial part arises from the distal edge of the flexor retinaculum of the hand and the tubercle of the
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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 Extensor pollicis brevis lies on the medial side of, and is closely connected with, the Abductor pollicis longus.

Origin and insertion

It arises from the dorsal surface of the body of the radius below that muscle, and from the interosseous membrane.
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The Abductor pollicis longus lies immediately below the Supinator and is sometimes united with it.

Origin and insertion

It arises from the lateral part of the dorsal surface of the body of the ulna below the insertion of the Anconæus, from the interosseous membrane, and
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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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In classical geometry, a radius (plural: radii) of a circle or sphere is any line segment from its center to its perimeter. By extension, the radius of a circle or sphere is the length of any such segment. The radius is half the diameter.
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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 Extensor pollicis brevis lies on the medial side of, and is closely connected with, the Abductor pollicis longus.

Origin and insertion

It arises from the dorsal surface of the body of the radius below that muscle, and from the interosseous membrane.
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The anatomical snuffbox, or radial fossa, (in Latin Foveola Radialis), is a triangular deepening on the radial, dorsal aspect of the hand - at the level of the carpal bones, specifically, the scaphoid and trapezium bones forming the floor.
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In human anatomy, the radial artery is the main blood vessel, with oxygenated blood, of the lateral aspect of the forearm.

Course

The radial artery arises from the bifurcation of the brachial artery in the cubital fossa.
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Phalanges is commonly given to the bones that form fingers and toes. In primates such as humans and monkeys, the thumb and big toe have two phalanges, while the other fingers and toes consist of three. Phalanges are classified as long bones.
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The thumb is one of the five fingers.

Anatomy of the thumb

Bones

The thumb consists of 3 bones:
  • distal phalanx (of the first digit)
  • proximal phalanx (of the first digit)
  • first metacarpal

Muscles


..... Click the link for more information.
In human anatomy, the radial artery is the main blood vessel, with oxygenated blood, of the lateral aspect of the forearm.

Course

The radial artery arises from the bifurcation of the brachial artery in the cubital fossa.
..... Click the link for more information.


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