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Serratus posterior superior muscle

German: Musculus serratus posterior superior

1 Definition

The serratus posterior superior muscle is part of the lower layer of the secondary migrated muscles of the back. This muscle group contains all muscles of the back, which developed primarily from the extremity buds and migrated secondarily into the back. Generally they are innervated by the rami anteriores of the spinal nerves.

2 Alignment

2.1 Origin

The serratus postertior superior muscle originates with its thin aponeurosis from the spinal processes of the two lowermost neck and the two uppermost thoracic vertebras.

2.2 Insertion

There are 3 to 4 descending aligned muscle spikes of the serratus posterior superior muscle. They insert in the second or third to fifth rib, laterally of the angulus costae.

3 Innervation

Like the most of the secondarily immigrated back muscles, the serratus posterior superior muscle is innervated by the front branches (rami anteriores) of the spinal nerves (segments: Th2 to Th5).

4 Function

The serratus posterior superior muscle elevates the ribs and supports thereby the inspiration. Due to the advantegous moment of force by reason of the progression of the axis in relation to the costal vertebral joint, the function of the muscle is easily explainable.

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Specialties: Anatomy

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