Serratus Anterior

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Historical reference: its only source is the original reference manual, and some of it may be out of date. Not used for AI answers until re-sourced.

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shoulderscapulaupper-bodystabilizer

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DefinitionA short reference note, not a full lesson.

Definition

The muscle along the rib cage that pulls the scapula forward and around the chest wall (protraction) and helps rotate it upward, acting as a stabilizer in most pressing movements.

Detail

The serratus anterior runs from the upper ribs to the medial border of the scapula, wrapping around the side of the rib cage. Its main job is protraction of the scapula (drawing the shoulder blade forward, away from the spine) and assisting upward rotation of the scapula so the arm can be raised overhead. Because it anchors the scapula against the rib cage, it appears throughout the source's exercise tables as a secondary (assisting/stabilizing) muscle rather than a prime mover — most often in pressing and overhead movements.

In the source it is labeled on the posterior upper-back diagram alongside the trapezius and rhomboids, and it is listed as a secondary muscle in exercises such as the bench press, incline press, military/overhead press, push-up, and several other pressing movements.

Key facts

Action: scapular protraction; assists upward rotation of the scapula.
Location: lateral rib cage, attaching to the medial border of the scapula.
Role: predominantly a stabilizer / secondary muscle in pressing and overhead work.

Connections

Scapular Movement — protraction is one of the scapular movements it drives.
Trapezius, Rhomboids (Major and Minor) — antagonist/partner scapular muscles (retraction vs protraction).
Bench Press, Strict Overhead Press (Military Press), Push-ups — exercises that recruit it as a secondary muscle.

Go deeperStrict Overhead Press (Military Press)

Sources

Historical reference · reference manual (page cited)

p.180p.232p.272p.320

Named in the posterior upper-back muscle diagram and in multiple secondary-muscle exercise lists.

Exercise guides

Flat Barbell Bench Press

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Explore related topics

Serratus Anterior

Rhomboids (Major and…Scapular Movement Trapezius Bench Press Strict Overhead Pres…Push-ups

Atlas Connections

Rhomboids (Major and Minor)Closely related

Two muscles between the spine and the inner edge of the scapula that retract (draw together) and downwardly rotate the shoulder blades — key to upright posture and rowing movements.

Scapular Movement

The scapula moves through elevation/depression, adduction (retraction)/abduction (protraction), and upward/downward rotation.

Trapezius

A muscle that functions as three different muscles — upper, middle, and lower traps — moving the scapula.

Bench Press

Flat horizontal-adduction press driven by the sternal pectoralis major, with anterior deltoid, triceps and serratus anterior assisting; the chest mass exercise and one of the three powerlifts.

Strict Overhead Press (Military Press)

Stand tall, brace, and press the bar from your collarbones to straight arms overhead with no leg drive, moving your head out of the way and back under the bar. The front deltoid leads, the side deltoid, triceps and the muscles that rotate the shoulder blade upward help, and your trunk holds you rigid.

Push-ups

Body-weight pressing exercise for the chest, triceps and anterior deltoid; an example of shoulder-joint extension.