El deltoides es un músculo intrínseco de la región del hombro. Tiene forma de triángulo invertido y se puede dividir en tres partes (anterior, media y posterior). Inserciones: se origina en el tercio lateral de la clavícula, el acromion y la espina de la escápula. Se inserta en la tuberosidad deltoidea en la cara externa del húmero. Inervación: nervio axilar. Acciones: Fibras anteriores: flexión y rotación medial en el hombro. Fibras posteriores: extensión y rotación lateral en el hombro. Fibras medias: abducción del hombro (toma el relevo del supraespinoso, que realiza la abducción en los primeros 15 grados). Irrigación sanguínea: arteria circunfleja humeral anterior y posterior. By TeachMeSeries Ltd (2026) Fig. 1: El deltoides y el redondo mayor. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Pro Feature - Dissection Atlas Prosection of the posterior shoulder region. The axillary nerve and posterior circumflex humeral artery can be seen passing through the quadrangular space Prosection of the posterior shoulder region. The axillary nerve and posterior circumflex humeral artery can be seen passing through the quadrangular space You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Frequent questions What is the deltoid muscle and where is it located? The deltoid muscle is an intrinsic muscle of the shoulder region, characterised by its inverted triangular shape. It is situated over the shoulder joint and is divided into three distinct parts: anterior, middle, and posterior. What are the main attachments of the deltoid muscle? The deltoid muscle originates from the lateral third of the clavicle, the acromion, and the spine of the scapula, and it inserts at the deltoid tuberosity on the lateral aspect of the humerus. These attachments allow it to play a crucial role in shoulder movement. How is the deltoid muscle innervated? The deltoid muscle is innervated by the axillary nerve. This nerve is essential for the muscle's function and movement of the shoulder joint. What actions does the deltoid muscle perform? The deltoid muscle facilitates several movements at the shoulder: the anterior fibres are responsible for flexion and medial rotation, the posterior fibres enable extension and lateral rotation, while the middle fibres primarily assist in shoulder abduction after the initial 15 degrees by the supraspinatus. What is the blood supply to the deltoid muscle? The deltoid muscle receives its blood supply from the anterior and posterior circumflex humeral arteries. This vascularisation supports its metabolic needs during various shoulder movements. Rate This Article