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M. Teres Major

Teres Major (Teres Maj R)

The M. Teres Major (Teres Major) is a muscle of the shoulder region. It is responsible for retroversion, adduction and internal rotation at shoulder joint. This muscle is not covered by the official SENIAM catalogue — placement is based on established clinical literature. This page documents the exact electrode position, anatomical attachments and a standardized test movement based on Hermens et al. (2000).

Function

Retroversion, adduction and internal rotation at shoulder joint

Opposite side: Teres Maj L
Rotate the body, see the electrode position in place — and check the neighbouring muscles right away. View in 3D Viewer
All 48 muscle protocols as a PDF — free
Print-ready for the lab or clinic: 84 pages of protocols (SENIAM + peer-reviewed), plus the SENIAM table, a placement checklist and a sensor comparison sheet as A4 sheets.

Anatomy

Origin Inferior angle of scapula (dorsal surface) Insertion Crest of lesser tubercle of humerus Innervation Lower subscapular nerve (posterior cord), C5–C6

Innervation after Perotto AO, Anatomical Guide for the Electromyographer, 5th ed. 2011 — an anatomical reference, not an electrode placement recommendation.

Test Movement

Internal rotation of arm against resistance with adducted arm

This muscle has no SENIAM-standardized electrode position. Placement should be based on anatomical knowledge.

MVC reference test (Konrad 2005)

Position
Simulated pull-up: elbows at about 90° flexion, check a frontal and a lateral arm position.
Fixation
Fixed bar or machine; trunk stabilised.
Resistance
Pulling against the fixed bar.
Control exercise
The same set-up may also produce maxima for the biceps and the lower trapezius.

The pull-up simulation produces the highest latissimus innervation; the lower trapezius and teres major share the set-up.

Konrad P. The ABC of EMG. Noraxon; 2005, p. 31. Konrad describes this test at group level; it applies to all muscles of the group. · Why and how to normalise to MVC

Measure M. Teres Major activity live

The electrode is placed — what next? easyEMG visualises muscle activity in real time, with SENIAM-compliant placement guidance, up to 4 channels at once and biofeedback training right afterwards.

In rehabilitation, the Teres Major is typically recorded to track progress and retrain activation.

EMG biofeedback in physiotherapy → What is EMG biofeedback?

Related Muscles in This Region

M. Trapezius Pars Transversa Middle Trapezius SENIAM M. Trapezius Pars Ascendens Lower Trapezius SENIAM M. Deltoideus Pars Clavicularis Anterior Deltoid SENIAM M. Deltoideus Pars Acromialis Middle Deltoid SENIAM M. Deltoideus Pars Spinalis Posterior Deltoid SENIAM
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EMG Guide as PDF — free

48 muscle protocols (SENIAM + peer-reviewed) on 84 pages, print-ready. Free via email.

Measure live EMG signals with easyEMG

Professional EMG biofeedback software for PicoBlue sensors. Real-time visualization, 5 training modes, PDF reports.

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EMG Guide as PDF — free
48 muscle protocols (SENIAM + peer-reviewed) on 84 pages, print-ready.