Deltoid muscle
Deltoid muscle
Superficial muscles of the chest and front of the arm.
Latin	musculus deltoideus
Gray's	subject #123 439
Origin:	clavicle, acromion, spine of the scapula
Insertion:	deltoid tuberosity of humerus
Artery:	primarily posterior circumflex humeral artery
Nerve:	Axillary nerve
Action:	shoulder abduction, flexion and extension
Antagonist:	Latissimus dorsi
Dorlands/Elsevier	m_22/12548745

In human anatomy, the deltoid muscle is the muscle forming the rounded contour of the shoulder. Image File history File links Deltoideus. ... Image File history File links Download high resolution version (531x650, 125 KB) Summary Licensing File links The following pages link to this file: Wikipedia:Grays Anatomy images with missing articles 9 Pectoralis major muscle List of images and subjects in Grays Anatomy: IV. Myology ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... A typical adult human skeleton consists of the following 206 bones, though this number does vary owing to a variety of anatomical variations; for example, a small portion of the human population have an extra rib, or an extra lumbar vertebra. ... Collarbone and collar bone redirect here. ... The acromion process, or simply the acromion, is an anatomical feature on the scapula. ... The spine of the scapula is a prominent plate of bone, which crosses obliquely the medial four-fifths of the dorsal surface of the scapula at its upper part, and separates the supra- from the infraspinatous fossa. ... A typical adult human skeleton consists of the following 206 bones, though this number does vary owing to a variety of anatomical variations; for example, a small portion of the human population have an extra rib, or an extra lumbar vertebra. ... The deltoid tuberosity is the region on the shaft of the humerus to which the the deltoid muscle attaches. ... The humerus is a long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ... Section of an artery For other uses, see Artery (disambiguation). ... The posterior humeral circumflex artery (posterior circumflex artery, posterior circumflex humeral artery) arises from the axillary artery at the lower border of the Subscapularis, and runs backward with the axillary nerve through the quadrangular space bounded by the Subscapularis and Teres minor above, the Teres major below, the long head... 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. ... Kinesiology is the scientific study of human movement. ... This article is about the body part. ... Abduction, in functional anatomy, is a movement which draws a limb away from the median plane of the body. ... In anatomy, Flexion is movement whereby bones or other objects are brought closer together. ... The leg extension is an isolation exercise. ... 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. ... Latissimus dorsi is a large flat muscle located on the back. ... Elseviers logo. ... List of bones of the human skeleton Human anatomy is primarily the scientific study of the morphology of the adult human body. ... A top-down view of skeletal muscle Muscle (from Latin musculus little mouse [1]) is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... This article is about the body part. ...

It was previously called 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). Look up Δ, δ in Wiktionary, the free dictionary. ...

The deltoid is a frequent site to administer intra-muscular injections. Intramuscular injection is the injection of a substance directly into a muscle. ...

Origin

It arises in three distinct sets of fibers:^[1]

• 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. ... Collarbone and collar bone redirect 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. ... The spine of the scapula is a prominent plate of bone, which crosses obliquely the medial four-fifths of the dorsal surface of the scapula at its upper part, and separates the supra- from the infraspinatous fossa. ...

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 and is built to withstand tension. ... 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. ... Fascia is specialized connective tissue layer which surrounds muscles, bones, and joints, providing support and protection and giving structure to the body. ...

Innervation

Axillary nerve (C5,C6) and lateral supraclavicular 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 exterial 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).

Training

Soldier performing a bench press, working the front deltoid

The deltoid muscle has three sections, the front head, the side head and the rear head. These heads have different actions and so need different strength training exercises to completely train the whole of the muscle. Download high resolution version (1000x565, 266 KB)A soldier in the U.S. Army performing a bench press, from the Task Force Eagle site, http://www. ... Download high resolution version (1000x565, 266 KB)A soldier in the U.S. Army performing a bench press, from the Task Force Eagle site, http://www. ... A soldier from the U.S. Army performs a 345 lb (156 kg) bench press The bench press is a form of weightlifting which primarily focuses on the development of the pectoral or chest muscles. ... Strength training is the use of resistance to muscular contraction to build the strength, endurance and size of skeletal muscles. ...

• The front deltoid is used in all pressing movements, such as the bench press, and can be trained adequately without any isolation movements. However for isolation front dumbbell raises are the most commonly used.

• The middle head of the deltoid is the main abductor at the gleno-humeral joint (shoulder) and is commonly trained using side lateral raises (also known as the shoulder fly. The middle head also benefits from overhead pressing movements.

• The rear head of the deltoid is best trained with bent-over dumbbell laterals (an inverted fly)

A soldier from the U.S. Army performs a 345 lb (156 kg) bench press The bench press is a form of weightlifting which primarily focuses on the development of the pectoral or chest muscles. ... Fly exercises can work through all three planes of motion. ... Fly exercises can work through all three planes of motion. ...

Structure

The Deltoid is a classical example of a multipennate muscle. A pennate muscle (also called a penniform muscle) is a muscle with fascicles that attach obliquely to its tendon. ...

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.

Additional images

Left clavicle. Superior surface. Image File history File links Gray200. ...	Left scapula. Dorsal surface. Image File history File links Download high resolution version (591x850, 63 KB) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...	Left humerus. Anterior view. Download high resolution version (653x1235, 79 KB) File links The following pages link to this file: Humerus Wikipedia:Grays Anatomy images with missing articles 5 Categories: Public domain images ...	Deep muscles of the chest and front of the arm, with the boundaries of the axilla. Image File history File links Gray411. ...
Muscles on the dorsum of the scapula, and the Triceps brachii. Image File history File links Gray412. ...	The scapular and circumflex arteries. Image File history File links Download high-resolution version (600x606, 177 KB) Summary Dorsal scapular artery (Latin: Arteria Dorsalis Scapulae. ...	The axillary artery and its branches. Image File history File links Gray523. ...	The brachial artery. Image File history File links Download high-resolution version (463x900, 117 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Biceps brachii muscle Brachioradialis Radial nerve Latissimus dorsi muscle Brachial artery Median nerve Ulnar nerve Deltoid muscle Pectoralis...
The veins of the right axilla, viewed from in front. Image File history File links Gray576. ...	The right brachial plexus with its short branches, viewed from in front. Image File history File links Gray808. ...	Suprascapular and axillary nerves of right side, seen from behind. Image File history File links Gray810. ...	Nerves of the left upper extremity. Image File history File links Download high resolution version (524x1000, 162 KB) File links The following pages link to this file: Ulnar nerve Long thoracic nerve Wikipedia:Grays Anatomy images with missing articles 17 Musculocutaneous nerve List of images in Grays Anatomy: IX. Neurology ...
The suprascapular, axillary, and radial nerves. Image File history File links Download high-resolution version (374x800, 73 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Rotator cuff Radial nerve Axillary nerve Wikipedia:Grays Anatomy images with missing articles 17 Deltoid muscle Teres...	Surface anatomy of the back. Image File history File links Download high-resolution version (504x700, 119 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Wikipedia:Grays Anatomy images with missing articles 25 Teres major muscle List of images in...

References

1. ^ Mnemonic at medicalmnemonics.com 3558

Not to be confused with pneumonic. ...

External links

• -691011507 at GPnotebook
• LUC delt
• SUNY Labs 03:03-0103
• Muscles/DeltoidPosterior at exrc.net
• Muscles/DeltoidAnterior at exrc.net
• Muscles/DeltoidLateral at exrc.net