Trapezius

Short definition

Scapular strap muscle: upper part elevates, middle retracts, the lower depresses.

Full definition

Trapezius — flat strap muscle from the posterior longitudinal ridge (C1) to T12, inserting on the clavicle, acromion and scapular spine: upper (C1–C4, elevates the scapula), middle (T1–T5, retracts), lower (T7–T12, depresses). Functions: scapular retraction, elevation, depression; head turn. Mass ≈ 0.7–1 % at 20–25 % body fat. Engaged in face-pull, shrug, bar support.

Examples

Narrow-grip face/pull — upper trapezius engaged.

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