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Escápula

Os scapulae

Flat and triangular, the scapula forms the posterior part of the shoulder girdle, articulating with the clavicle and the humerus and giving attachment to numerous muscles. It rests on the posterolateral thorax between the second and seventh ribs. Its surface features include the spine, the acromion, the coracoid process, the glenoid cavity that receives the head of the humerus, the supraspinous and infraspinous fossae, and the subscapular fossa. Fractures usually follow high-energy trauma and often accompany injuries within the thorax. Palsy of the long thoracic nerve causes scapular winging, in which the medial border lifts away from the chest wall, and the acromion may impinge on the rotator cuff.

La escápula se sitúa en la cara posterolateral del tórax, entre la 2.ª y la 7.ª costilla. Sus rasgos principales incluyen la espina, el acromion, el proceso coracoides, la cavidad glenoidea (para la articulación del hombro) y las fosas supraespinosa, infraespinosa y subescapular.

On this page
Tipo Bone
Sistema corporal Esquelético
Región corporal Hombro
Estructura principal endochondral bone
Nombre latino Os scapulae
FMA ID 13394

Función

Un hueso plano y triangular que forma la parte posterior de la cintura escapular. Proporciona inserción a numerosos músculos y se articula con la clavícula y el húmero.

Significado clínico

Las fracturas de escápula suelen resultar de traumatismos de alta energía y a menudo se asocian con lesiones torácicas. El aleteo escapular se produce con la parálisis del nervio torácico largo. El proceso del acromion puede pinzar el manguito rotador.

Frequently Asked Questions

What is the function of the scapula?

The scapula (shoulder blade) is a flat triangular bone that serves as the attachment site for 17 muscles involved in arm and shoulder movement. It forms two important joints: the glenohumeral joint (shoulder joint) via the glenoid cavity, and the acromioclavicular joint via the acromion. The scapula enables a wide range of arm movements through coordinated scapular rotation, elevation, depression, protraction, and retraction.

Where is the scapula located?

The scapula lies on the posterior thoracic wall, overlying approximately ribs 2 through 7. It is a floating bone with no direct bony connection to the axial skeleton — it is held in place entirely by muscles. The spine of the scapula, a prominent ridge on its posterior surface, is easily palpable and leads to the acromion, which projects over the shoulder joint.

What is a scapular winging?

Scapular winging occurs when the medial border of the scapula protrudes abnormally from the posterior chest wall, resembling a wing. The most common cause is paralysis of the serratus anterior muscle due to injury of the long thoracic nerve (C5–C7), which is vulnerable to traction injuries. Less commonly, trapezius weakness from spinal accessory nerve damage causes lateral winging.

References

  1. Foundational Model of Anatomy — FMA:13394 Reference anatomy ontology (University of Washington)
  2. UBERON — UBERON:0006849 Cross-species anatomy ontology (EMBL-EBI Ontology Lookup Service)
  3. Wikipedia — Escápula Encyclopedia article (verified cross-reference)

Aviso médico

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Educational Disclaimer

This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical decisions.

Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.