Posterior compartment of the arm

Information about Posterior compartment of the arm

Cross-section through the middle of upper arm.
Arteryprofunda brachii
Nervemuscular branches of the radial nerve
The posterior compartment of the arm contains muscles which are all supplied by the radial nerve. This compartment is also known as the "extensor compartment", extension being its main action.

The muscles of this compartment are the triceps brachii and anconeus muscle.
  • The triceps brachii is a large muscle containing three heads (lateral, medial, and middle).
  • The anconeus is a small muscle stabilizes the elbow joint during movements. Some embryologists consider it as the fourth head of the triceps brachii. As the upper and lower limbs have similar embryological origins and the lower limb contains the quadriceps femoris muscle (the lower limb equivalent of the triceps), which has four heads, this would seem to make sense.

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General anatomy of upper limbs
Arm
Forearm
Hand
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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
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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The arteria profunda brachii (also known as deep artery of the arm) is a large vessel which arises from the medial and back part of the brachial, just below the lower border of the Teres major.
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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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The muscular branches of the radial nerve supply the Triceps brachii, Anconæus, Brachioradialis, Extensor carpi radialis longus, and Brachialis, and are grouped as medial, posterior, and lateral.
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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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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 triceps brachii muscle is often simply called the triceps (both singular and plural). However, the term triceps (Latin for "three-headed") can mean any skeletal muscle having three origins.
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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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Embryology is the study of the development of an embryo. An embryo is defined as any vertebrate in a stage before birth or hatching. Embryology refers to the development of the egg cell (zygote) after fertilization and the differentiation of cells into tissues and organs.
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"Quads" redirects here. For other uses see Quad
The quadriceps femoris (quadriceps, quadriceps extensor, guads or quads) includes the four prevailing muscles on the front of the thigh.
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Georgetown University is a private, Jesuit, research university, located in Washington, D.C.'s Georgetown neighborhood. Father John Carroll founded the school in 1789, though its roots extend back to 1634.
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Dartmouth College is a private, coeducational university located in Hanover, New Hampshire, USA. Incorporated as "Trustees of Dartmouth College,"[6][7]
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Memorial University of Newfoundland, (popularly known as Memorial University or "MUN") is a comprehensive university located primarily in St. John's, Newfoundland and Labrador, Canada.
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Human anatomy is primarily the scientific study of the morphology of the adult human body.[1] It is subdivided into gross anatomy and microscopic anatomy.[1]
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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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An arm is an upper limb of the body.

Arm (or arms) may also refer to:
  • Armaments, weapons; as in Small arms, Right to bear arms
  • Eta Capricorni, a star, traditional name "Arm"

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The clavipectoral triangle (or deltopectoral triangle) is an anatomical triangle bordered by the following structures:
  • pectoralis major
  • deltoid
  • clavicle
It contains the cephalic vein.
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The Quadrangular Space is a space in the shoulder through which the axillary nerve, the posterior humeral circumflex artery and accompanying veins pass. Four muscles define the posterior edges of the space; teres minor on top, the teres major on the bottom, the long head of the
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The triangular space contains the scapular circumflex vessels.[1]

It is bounded by the Teres minor superiorly, the Teres major inferiorly, and the long head of the Triceps laterally.
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The triangular interval is the space between the long head of the triceps brachii and the humerus, just inferior to the teres major.

The radial nerve and profunda brachii pass through the triangular interval.
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For the bowling style in cricket, see .


The underarm (or armpit, axilla, or oxter) is the area on the human body directly under the joint where the arm connects to the shoulder.
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axillary sheath—continuous above with the deep cervical fascia. A brachial plexus nerve block can be achieved by injecting anaesthetic into this area.

External links

  • SUNY Labs 05:01-0200
  • Description at upstate.

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The lower border of Pectoralis major forms the rounded anterior axillary fold.

See also

  • underarm

External links

  • anterior+axillary+fold at eMedicine Dictionary
  • Description at umich.

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Not to be confused with Fuchsia.


Fascia (făsh'ē-ə), pl. fas·ci·ae (făsh'ē-ē), adj. fascial (făsh'ē-əl) (from latin: a band) is the soft tissue component of the connective tissue system that
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axillary fascia.

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.
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The Brachial Fascia (deep fascia of the arm) is continuous with that covering the Deltoideus and the Pectoralis major, by means of which it is attached, above, to the clavicle, acromion, and spine of the scapula; it forms a thin, loose, membranous sheath for the muscles of
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fascial compartments, and are formed by tough connective tissue septa. The (upper) arm is divided into two compartments by the lateral intermuscular septum and the medial intermuscular septum: anterior and posterior.
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The anterior compartment of the arm is known as the "flexor compartment" as flexion is its main action.

The muscles contained therein are the biceps brachii, brachialis, and coracobrachialis.
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The lateral intermuscular septum extends from the lower part of the crest of the greater tubercle of the humerus, along the lateral supracondylar ridge, to the lateral epicondyle; it is blended with the tendon of the Deltoideus, gives attachment to the Triceps brachii behind, to
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The medial intermuscular septum, thicker than the lateral intermuscular septum, extends from the lower part of the crest of the lesser tubercle of the humerus below the Teres major, along the medial supracondylar ridge to the medial epicondyle; it is blended with the tendon of the
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