Semimembranosus (Semimem L)
The M. Semimembranosus (Semimembranosus) is a muscle of the thigh posterior region. It is responsible for knee flexion, hip extension, internal rotation of the lower leg with flexed knee. 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).
Knee flexion, hip extension, internal rotation of the lower leg with flexed knee
Innervation after Perotto AO, Anatomical Guide for the Electromyographer, 5th ed. 2011 — an anatomical reference, not an electrode placement recommendation.
Knee flexion in prone position against resistance with internal rotation
This muscle has no SENIAM-standardized electrode position. Placement should be based on anatomical knowledge.
Konrad tests the hamstrings as one group ("Mm. ischiocrurales"); surface EMG does not separate the medial and lateral heads well.
Konrad P. The ABC of EMG. Noraxon; 2005, p. 32. Konrad describes this test at group level; it applies to all muscles of the group. · Why and how to normalise to MVC
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 training, what matters for this muscle is targeted activation and left/right symmetry.
Interactive SENIAM electrode placement — free, instant access, no sign-up required.
Open 3D Viewer →48 muscle protocols (SENIAM + peer-reviewed) on 84 pages, print-ready. Free via email.
Professional EMG biofeedback software for PicoBlue sensors. Real-time visualization, 5 training modes, PDF reports.