Flexor Digitorum Superficialis (FDS R)
The M. Flexor Digitorum Superficialis (Flexor Digitorum Superficialis) is a muscle of the forearm region. It is responsible for flexion at the proximal interphalangeal joint (PIP) of fingers II-V, wrist flexion. 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).
Flexion at the proximal interphalangeal joint (PIP) of fingers II-V, wrist flexion
On the flexor side of the mid-forearm, approximately three quarters of the distance from the elbow to the wrist; flex only the fingers (not the wrist) and record where the movement is felt most clearly
Orientation: Parallel to the muscle fibres, 2 cm inter-electrode distance - quasi-specific site, crosstalk from the neighbouring finger flexors
Criswell E. Cram's Introduction to Surface Electromyography. 2nd ed. Jones & Bartlett Learning; 2011. ISBN 978-0-7637-3274-5.
Criswell (2011) — Cram's Introduction to Surface Electromyography, 2nd edition — is the standard textbook for surface EMG electrode placement beyond the SENIAM catalogue. Its atlas section (Part III) describes, for each site, palpation, electrode location with 2 cm spacing parallel to the fibres, a behavioural test and the neighbouring muscles from which crosstalk is to be expected. Cram's classifies the position used here as "quasi-specific" — the muscle cannot be fully separated from its neighbours at the surface. The position is established in practice but less validated than a SENIAM recommendation.
Based on SENIAM recommendations (Hermens et al. 2000). Not an official SENIAM product. See all references → · How electrodes are placed (guide) · Glossary
Innervation after Perotto AO, Anatomical Guide for the Electromyographer, 5th ed. 2011 — an anatomical reference, not an electrode placement recommendation.
Finger flexion at the middle joint against resistance
This muscle has no SENIAM-standardized electrode position. Placement should be based on anatomical knowledge.
Konrad treats the forearm flexors and extensors as one group; wrist flexion for the flexors, wrist extension for the extensors.
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
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 therapy, this muscle is usually about tone regulation and consciously relaxing below a threshold.
On the flexor side of the mid-forearm, approximately three quarters of the distance from the elbow to the wrist; flex only the fingers (not the wrist) and record where the movement is felt most clearly. Orientation: Parallel to the muscle fibres, 2 cm inter-electrode distance - quasi-specific site, crosstalk from the neighbouring finger flexors. Not covered by SENIAM — placement per Criswell 2011.
Finger flexion at the middle joint against resistance. It serves as a signal check before recording: with correct electrode placement the EMG amplitude rises clearly during this movement.
No. The M. Flexor Digitorum Superficialis is not included in the official SENIAM catalogue. The electrode position documented here follows the established protocol per Criswell 2011.
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