Middle Trapezius

Authors

Affiliations

Nathaniel Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Muscle	Origin	Insertion	Innervation	Action
Middle trapezius	Aponeurosis of T1-T4 SP	Acromion	Accessory n. (CN XI) C3 - C4	Scapula: Retraction

Middle trapezius AKA Transverse part of the trapezius

Origin

Aponeurosis at T1–T4 SP¹

Insertion

Acromion of Scapula¹

Innervation

• Motor: CN XI Accessory n. (C3, C4)²
• Proprioception: Cervical plexus (C2, C3, C4)¹

Action

• Scapular retraction¹
• Stabilize the scapula during upward rotation¹
  • Stabilizes the serratus anterior during upward rotation by counteracting the protraction Serratus Anterior¹

References

1.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.

2.

Brazis PW, Masdeu JC, Biller J. Localization in Clinical Neurology. 8th ed. Wolters Kluwer Health; 2022.