Deltoid muscle
(Redirected from Deltoideus)
Deltoid muscle is a large triangular muscle covering the shoulder joint.
Anatomy[edit | edit source]
- The deltoid muscle arises from the anterior border and upper surface of the lateral third of the clavicle
- The deltoid is inserted into the deltoid prominence on the middle of the lateral side of the body of the humerus.
- At its insertion the muscle gives off an expansion to the deep fascia of the arm.
- The deltoid muscle is remarkably coarse in texture
- Variations—Large variations uncommon.
Function[edit | edit source]
The deltoid muscle helps abduct, flex, extend and rotate the arm.
Blood supply[edit | edit source]
The deltoid is supplied by the following three arteries:
- thoracoacromial artery (acromial and deltoid branches)
- the circumflex humeral arteries, and
- the profunda brachii artery (deltoid branch).
Nerve supply[edit | edit source]
The deltoid muscle is innervated by the axillary nerve
Common problems associated with deltoid muscle[edit | edit source]
The most common abnormalities affecting the deltoid muscle are tears, fatty atrophy, and enthesopathy.
IM injections[edit | edit source]
Most intramuscular injections in the upper arm are given in to the deltoid muscle in an inverted triangular area in the upper portion of the arm.
- Find the bony prominence at the top of the arm called acromion process.
- The top border of an inverted triangle is two finger widths down from the acromion process.
- Stretch the skin and then hold or fell the muscle.
- Insert the needle at a right angle(90 degrees) to the skin in the center of the inverted triangle
Etiology of name[edit | edit source]
The name deltoid refers to the shape of the Greek letter Delta
Other names[edit | edit source]
Deltoideus
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Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.Contributors: Prab R. Tumpati, MD