Serratus Anterior

serratus anterior
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The serratus anterior muscle is a fan-formed muscle at the parallel mass of the thorax. Its primary part lies profound under the scapula and the pectoral muscles. It is anything but difficult to palpate between the pectoralis major and latissimus dorsi muscles.  It starts on the best surface of the eight or nine upper ribs.


serratus anterior


The inclusion of serratus anterior

It embeds precisely at the anterior fringe of the scapula, or shoulder blade. The muscle is partitioned into three sections:

Upper/Superior: first to second rib → unrivaled point of the scapula.

Center/Intermedius: second to third rib → average fringe of a scapula.

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Lower/Inferior: fourth to ninth rib → average fringe and the substandard edge of the scapula.

It is the most ground-breaking and conspicuous part.


The capability of serratus anterior

The capacity of the serratus foremost muscle is to permit the forward revolution of the arm and to pull the scapula forward and around the rib confine. The scapula can move horizontally because of the serratus foremost muscle, or, in other words, the rise of the arm. The serratus foremost muscle likewise permits the upward revolution of the arm, which enables a man to lift things over their head.[1] When the shoulder bone is in a settled position, e.g. breathing after a dash, the serratus anterior lifts the ribcage and in this way underpins breathing.

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Clinical pertinence

The long thoracic nerve is exceptionally influenced amid medical procedure of the anterolateral thorax, for instance, amid axillary dismemberment or radical mastectomy, and this can prompt damage this nerve and result of damage of serratus anterior muscle. Normal side effects for this damage are scapular winging and loss of capacity to raise the influenced arm overhead. Additionally prompt interminable denervation of the serratus foremost muscle, noticeable ceaseless muscle compression, with the gathering of harmful metabolites, and agony pathways causing focal refinement. Moreover, the serratus anterior muscle is in danger of damage on the off chance that it is dismembered together with the pectoralis muscles to make the pocket required for bosom expanders. Other foundations for damage of long thoracic nerve are injury and a pressure because of conveying overwhelming burdens (e.g. knapsack) and injury.



  • The serratus anterior muscle is thin and covers the side of the ribcage.
  • You can feel it by putting your hand just beneath the armpit.
  • It likewise encounters how your ribs feel, so you can separate the ribs and this thin and shallow muscle.
  • To do as such, simply feel the principal ribs under your areola.
  • Presently you will have the capacity to recognize the muscle from the ribs.
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Serratus Anterior Muscle Pain Syndrome (SAMPS)

Incessant chest torment of non-cardiac beginning is a heterogeneous tissue, and myofascial torment disorder is regularly a neglected reason that can influence a solitary muscle or a few useful muscle units; it is portrayed by tight groups, ordinarily depicted as trigger focuses. The disorder incorporates a group of stars of manifestations one of which is torment overlying the fifth to seventh ribs in the midaxillary line. Alluded agony may transmit toward the foremost chest divider, the average part of the arm, lastly, around the ring and little finger on the ipsilateral side. The torment of SAMPS can be irregular or steady. The serratus fundamentally adds to:

  • Pain between shoulder bones
  • Golfers elbow torment
  • Rib torment
  • Arm pain
  • Differential Diagnosis



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