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Encyclopedia > Deltoideus
Deltoid muscle
Deltoid muscle
Latin Deltoideus
Gray's subject #123
Origin:
Insertion:
Blood:
Nerve: Axillary nerve
Action:

The deltoid muscle is the muscle forming the rounded contour of the human shoulder. Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ... A typical adult human skeleton consists of the following 206 bones. ... A typical adult human skeleton consists of the following 206 bones. ... List of human nerves External links List of nerves This is an incomplete list, which may never be able to satisfy certain standards for completeness. ... The axillary nerve is a nerve of the human body, that comes off the posterior cord of the brachial plexus at the level of the axilla (armpit) and carriers nerve fibers from C5 and C6. ... A top-down view of skeletal muscle Muscle is the contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... The human upper arm Grays Fig. ...


It was earlier called as the Deltoideus and the name is still used by some anatomists. It is called so because it is in the shape of the Greek letter Delta (triangle). Delta (upper case Δ, lower case δ) is the fourth letter of the Greek alphabet. ...


The deltoid is a frequent site to administer intra-muscular injections.

Contents


Origin

It arises in three distinct sets of fibres:

  • Anterior fibres: from the anterior border and upper surface of the lateral third of the clavicle
  • Middle fibres: from the lateral margin and upper surface of the acromion
  • Posterior fibres: from the lower lip of the posterior border of the spine of the scapula, as far back as the triangular surface at its medial end

In zootomy, several terms are used to describe the location of organs and other structures in the body of bilateral animals. ... Left clavicle - from above Left clavicle - from below Collarbone (a bone) redirects here. ... The acromion process, or simply the acromion, is an anatomical feature on the scapula. ... The English word POSTERIOR is identical to the original Latin adjective, and has two different uses : as an ADJECTIVE, it indicates that someone or something is behind another, either spatially or chronologically it also became a SUBSTANTIVE, indicating the rear-end, especially of a person, i. ... Left scapula - front view () Left scapula - rear view () In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone). ...

Insertion

From this extensive origin the fibers converge toward their insertion, the middle passing vertically, the anterior obliquely backward and lateralward, the posterior obliquely forward and lateralward; they unite in a thick tendon, which is inserted into the V-shaped deltoid tubercle on the middle of the lateral aspect of the shaft of the humerus. At its insertion the muscle gives off an expansion to the deep fascia of the arm. A tendon or sinew is a tough band of fibrous connective tissue that connects muscle to bone. ... The term lateral can refer to: an anatomical definition of direction. ... The humerus is a long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ...


Innervation

Axillary nerve (C5,C6) The axillary nerve is a nerve of the human body, that comes off the posterior cord of the brachial plexus at the level of the axilla (armpit) and carriers nerve fibers from C5 and C6. ...


Action

The anterior fibres are involved in shoulder abduction when the shoulder is externally rotated. The anterior deltoid is weak in strict transverse flexion but assists the pectoralis major during shoulder transverse flexion / shoulder flexion (elbow slightly inferior to shoulders). Location The clavicular head of the pectoralis major takes its origin from the anterior surface of the medial half of the clavicle. ...


The posterior fibres are strongly involved in transverse extension particularly since the latissimus dorsi is very weak in strict transverse extension. The posterior deltoid is also the primary shoulder hyperextensor. Latissimus dorsi is a large flat muscle located on the back. ...


The lateral fibres are involved in shoulder abduction when the shoulder is internally rotated, are involved in shoulder flexion when the shoulder is internally rotated, and are involved in shoulder transverse abduction (shoulder externally rotated) -- but are not utilized significantly during strict transverse extension (shoulder internally rotated).


Structure

The Deltoid is a classical example of a multipennate muscle.


The middle fibres of the muscle arise in a bipenniform manner (like a bird's feather) from the sides of the tendinous intersections, generally four in number, which are attached above to the acromion and pass downward parallel to one another in the substance of the muscle. The oblique fibers thus formed are inserted into similar tendinous intersections, generally three in number, which pass upward from the insertion of the muscle and alternate with the descending septa. The portions of the muscle arising from the clavicle and spine of the scapula are not arranged in this manner, but are inserted into the margins of the inferior tendon.


External links

Muscles of the Head -- Neck -- Trunk -- Upper limb -- Lower limb -- LIST OF ALL MUSCLES

VERTEBRAL COLUMN: trapezius | latissimus dorsi | rhomboid major | rhomboid minor | levator scapulae | (Gray's s121) GPnotebook is a British medical database for general practitioners (GPs. ... This article or section contains information that has not been verified and thus might not be reliable. ... A top-down view of skeletal muscle Muscle is the contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... This is a list of muscles of the human anatomy. ... The vertebral column seen from the side Different regions (curvatures) of the vertebral column The vertebral column (backbone or spine) is a column of vertebrae situated in the dorsal aspect of the abdomen. ... In human anatomy, the trapezius is a large superficial muscle on a persons back. ... Latissimus dorsi is a large flat muscle located on the back. ... Location The rhomboid major takes its origin from the spinous processes of the T2 to T5 vertebrae. ... Location The rhomboid minor takes its origin from the nuchal ligaments and spinous processes of C7 to T1 vertebrae. ... Location The levator scapulae takes its origin from the posterior tubercles of the tranverse processes of the C1 to C4 vertebrae. ... Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


ANTERIOR AND LATERAL THORACIC WALLS: pectoralis major | pectoralis minor | subclavius | serratus anterior | (Gray's s122) The thoracic cavity is the chamber of the human body (and other animal bodies) that is enclosed by the ribcage and the diaphragm. ... Grays Fig. ... Location The pectoralis minor muscle takes its origin from the 3rd to 5th ribs, near their costal cartilages. ... The Subclavius muscle is a muscle of the human body. ... Serratus anterior Serratus anterior muscle is the surface of upper 9 ribs at side of chest - anterior aspect along entire length of medial border of scapula - (protraction) draws medial border of scapula away from vertebrae (upward rotation). ... Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


SHOULDER AND ROTATOR CUFF: deltoid | subscapularis | supraspinatus | infraspinatus | teres minor | teres major | (Gray's s123) The human upper arm Grays Fig. ... The rotator cuff is an anatomical term given to the group of muscles and their tendons that act to stabilize the shoulder. ... The Subscapularis muscle is a muscle of the human body. ... // Supraspinatus muscle The supraspinatus is a relatively small muscle of the upper limb that takes its name from its origin from the supraspinous fossa superior to the spine of the scapula. ... The Infraspinatus muscle is a lateral rotator of the glenohumeral joint. ... Wikipedia does not yet have an article with this exact name. ... Teres major is a muscle of the upper limb and one of six scapulohumeral muscles. ... Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


ARM: coracobrachialis | biceps brachii | brachialis | triceps brachii | (Gray's s124) ARM may stand for: Most likely: ARM Ltd (originally Advanced RISC Machines) ARM architecture CPU design or one of its derivatives developed by ARM Ltd (originally called The Acorn RISC Machine) Adjustable rate mortgage Annotated Reference Manual (C++) Artificial rupture of membranes (see amniotic sac) the ISO 3166-1 3... The coracobrachialis is one of the three muscles that attach to the coracoid process of the scapula. ... In human anatomy, the biceps brachii is a muscle on the upper arm that acts to flex the elbow. ... Brachialis is a flexor muscle in the upper arm. ... The triceps brachii muscle is a large three-headed skeletal muscle found in humans. ... Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


FOREARM: Volar superficial | pronator teres | palmaris longus | flexor carpi radialis | flexor carpi ulnaris | flexor digitorum superficialis | Volar deep | flexor digitorum profundus | flexor pollicis longus | pronator quadratus | Dorsal superficial | brachioradialis | extensor digitorum | extensor carpi radialis longus | extensor digiti minimi | extensor carpi radialis brevis | extensor carpi ulnaris | anconeus | Dorsal deep | supinator | extensor pollicis brevis | abductor pollicis longus | extensor pollicis longus | (Gray's s125) The forearm is the structure on the upper limb, between the elbow and the wrist. ... The Pronator teres muscle is a muscle of the human body, in the forearm. ... The Palmaris longus muscle is a muscle of the human body. ... In anatomy, flexor carpi radialis is a muscle of the human forearm that acts to flex and abduct the hand. ... In anatomy, flexor carpi ulnaris muscle is a muscle of the human forearm that acts to flex and adduct the hand. ... Flexor digitorum superficialis is an extrinsic flexor muscle of the fingers. ... The flexor digitorum profundis is a muscle in the forearm that flexes the fingers. ... The Flexor pollicis longus muscle is a muscle of the human body. ... Pronator quadratus is a square shaped muscle on the distal forearm that acts to pronate (turn so the palm faces downwards) the hand. ... Brachioradialis is a muscle located in the forearm, that acts to flex the forearm. ... The Extensor digitorum muscle is a muscle of the human body. ... Extensor carpi radialis longus is one of the five main muscles that control movement at the wrist. ... The extensor digiti minimi is a muscle of the forearm that extends the little finger at all joints. ... The extensor carpi radialis brevis is specific human muscle. ... Extensor carpi ulnaris is a muscle, located in the forearm of human bodies that acts to extend and adduct the wrist. ... The anconeus muscle is a small muscle on the posterior surface of the elbow. ... The Supinator muscle is a muscle of the human body. ... The Extensor pollicis brevis muscle is a muscle of the human body. ... The Abductor pollicis longus muscle is a muscle of the human body. ... The Extensor pollicis longus muscle is a muscle of the human body. ... Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


HAND: Lateral volar | abductor pollicis brevis | opponens pollicis) | flexor pollicis brevis | adductor pollicis | Medial volar | palmaris brevis | abductor digiti quinti | flexor digiti quinti brevis | opponens digiti minimi | Intermediate | lumbrical | dorsal interossei | palmar interossei | (Gray's s126) A human hand typically has four fingers and a thumb The hand (med. ... The Abductor pollicis brevis muscle is a muscle of the human body. ... The Opponens pollicis muscle is a muscle of the human body. ... The Flexor pollicis brevis muscle is a muscle of the human body. ... The Adductor pollicis muscle is a muscle of the human body. ... The Palmaris brevis muscle is a muscle of the human body. ... For the muscle of the foot, see Abductor digiti quinti muscle The Abductor digiti quinti (Abductor minimi digiti) is situated on the ulnar border of the palm of the hand. ... The Opponens digiti minimi muscle is a muscle of the human body. ... The lumbrical muscles are intrinsic muscles in the fingers that allow flexion at the metacarpophalangeal joints, while maintaining extension at the interphalangeal joints. ... The Palmar interossei muscles is a muscle of the human body. ... Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...


  Results from FactBites:
 
IV. Myology. 7c. The Muscles and Fasciæ of the Shoulder. Gray, Henry. 1918. Anatomy of the Human Body. (1230 words)
In front it is continuous with the fascia covering the Pectoralis major; behind, where it is thick and strong, with that covering the Infraspinatus; above, it is attached to the clavicle, the acromion, and the spine of the scapula; below, it is continuous with the deep fascia of the arm.
It is intimately attached to the deltoid fascia along the over-lapping border of the Deltoideus.
—The Supraspinatus assists the Deltoideus in raising the arm from the side of the trunk and fixes the head of the humerus in the glenoid cavity.
  More results at FactBites »

 
 

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