If the serratus anterior is paralyzed, as in damage to the serratus anterior, or damage to its nerve, the long thoracic nerve, then the scapula rebounds backwards, giving a condition known as winged scapula, where the inferior angle and medial border of scapula protrude outwards. The serratus anterior actually makes sure that the scapula is pulled anteriorly towards the ribs. If an injury or condition causes these muscles to become weak or imbalanced, it can alter the position of the scapula at rest or in motion. The bone is surrounded and supported by a complex system of muscles that work together to help you move your arm. Anteriorly, it provides the insertion for some fibres of the serratus anterior muscle. The scapula, or shoulder blade, is a large triangular-shaped bone that lies in the upper back. It is located at the level of T7 (recall that the scapula runs from T2-T7, thus, this makes sense). The inferior angle is the inferiormost part of the scapula, and is formed by the fusion of the medial and lateral borders of the scapula. Angles of the ScapulaĪs discussed already, there are 3 angles of the scapula: Inferior Angle Gives Origin to: Coracobrachialis and short head of biceps brachii at apex of coracoid process.Īttaches: Coracoclavicular Ligament, Coracoacromial Ligament, Coracohumeral Ligament (All 3 of these will be explained under a different topic, the Shoulder Joint).
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