{
    "@context": "https://schema.org",
    "@type": "Dataset",
    "name": "M. Trapezius Pars Descendens — surface EMG electrode placement",
    "id": "trapezius_descendens_r",
    "slug": "trapezius-descendens-r",
    "url": {
        "en": "https://emgguide.de/muscle/trapezius-descendens-r",
        "de": "https://emgguide.de/de/muscle/trapezius-descendens-r",
        "viewer3d": "https://emgguide.de/?muscle=trapezius_descendens_r",
        "json": "https://emgguide.de/muscle/trapezius-descendens-r.json"
    },
    "names": {
        "latin": "M. Trapezius Pars Descendens",
        "en": "Upper Trapezius",
        "de": "Oberer Trapezmuskel"
    },
    "side": "right",
    "region": {
        "key": "HEAD_NECK",
        "en": "Head & Neck",
        "de": "Kopf & Nacken"
    },
    "placementStandard": "SENIAM (Hermens et al. 2000)",
    "source": {
        "url": "http://seniam.org/trapeziusdescendens.html",
        "short": "SENIAM (Hermens 2000)",
        "citation": "Hermens HJ, Freriks B, Disselhorst-Klug C, Rau G. Development of recommendations for SEMG sensors and sensor placement procedures. J Electromyogr Kinesiol. 2000;10(5):361-74."
    },
    "electrode": {
        "position": {
            "en": "50% on line from acromion to C7 spinous process",
            "de": "50% auf Linie von Acromion zu Wirbelsäule C7"
        },
        "orientation": {
            "en": "Toward acromion–C7 line",
            "de": "Richtung Linie Acromion–C7"
        },
        "sensorRules": "bipolar Ag/AgCl, ≤ 10 mm conductive diameter, 20 mm inter-electrode distance, parallel to fibres, reference electrode on bone (SENIAM)"
    },
    "landmarks": {
        "rule": "electrode at fraction t of the line from a to b",
        "a": {
            "id": "acromion",
            "en": "Acromion",
            "de": "Akromion",
            "model_xyz_m": null
        },
        "b": {
            "id": "c7",
            "en": "C7 spinous process",
            "de": "Dornfortsatz C7",
            "model_xyz_m": null
        },
        "t": 0.5,
        "extra": null,
        "note": null,
        "coordinates": "model space of the 3D viewer (metres, y up); for orientation only, not body measurements"
    },
    "anatomy": {
        "function": {
            "en": "Elevation of scapula, lateral flexion of cervical spine, head extension",
            "de": "Elevation der Scapula, Lateralflexion der HWS, Extension des Kopfes"
        },
        "origin": {
            "en": "External occipital protuberance, Lig. nuchae, Proc. spinosi C1–C7",
            "de": "Protuberantia occipitalis externa, Lig. nuchae, Proc. spinosi C1–C7"
        },
        "insertion": {
            "en": "Lateral third of clavicle, acromion",
            "de": "Laterales Drittel der Clavicula, Acromion"
        },
        "innervation": {
            "en": "Spinal accessory nerve (spinal portion) with twigs from C3–C4",
            "de": "N. accessorius (Pars spinalis) mit Ästen aus C3–C4"
        }
    },
    "testMovement": {
        "en": "Elevate shoulder against resistance (shoulder shrug)",
        "de": "Schulter gegen Widerstand anheben (Schulterzucken)"
    },
    "placementNotes": {
        "source": "Criswell E. Cram's Introduction to Surface Electromyography. 2nd ed. Jones & Bartlett; 2011, p. 289",
        "site": "Upper Trapezius (Narrow)",
        "placementType": "specific",
        "signalCheck": {
            "de": "Schulter hochziehen (Shrug) oder Kopf seitneigen.",
            "en": "Shoulder elevation (shrug) or lateral bending of the head."
        },
        "crosstalk": {
            "de": [
                "mittlere Trapezius-Fasern",
                "Levator scapulae",
                "Supraspinatus"
            ],
            "en": [
                "middle trapezius fibres",
                "levator scapulae",
                "supraspinatus"
            ]
        },
        "artifacts": {
            "de": "EKG und Atmung.",
            "en": "ECG and breathing."
        }
    },
    "mvcTest": {
        "source": "Konrad P. The ABC of EMG. Noraxon; 2005, p. 31",
        "group": "trapezius_upper",
        "en": {
            "position": "Seated, arms hanging at the side; the test can be done on one side only.",
            "fixation": "Arm fixed downwards: manually, with a strap to the floor, or by holding a load heavy enough to press the shoulder down.",
            "resistance": "Shoulder elevation (shrug) against the fixed arm.",
            "control": "—",
            "note": "Konrad calls the load variant \"difficult\" — the load has to be heavy enough that the shoulder cannot rise."
        },
        "de": {
            "position": "Sitzend, Arme hängen seitlich; der Test kann einseitig ausgeführt werden.",
            "fixation": "Arm nach unten fixiert: manuell, mit Gurt zum Boden oder durch eine Last, die schwer genug ist, die Schulter unten zu halten.",
            "resistance": "Schulterheben (Schulterzucken) gegen den fixierten Arm.",
            "control": "—",
            "note": "Konrad nennt die Last-Variante „schwierig\" — die Last muss so schwer sein, dass die Schulter nicht nach oben kommt."
        }
    },
    "measurability": "surface EMG",
    "license": "Free to cite with attribution to emgguide.de. Electrode placements based on SENIAM (Hermens et al. 2000) and the cited literature; not an official SENIAM product; not a substitute for medical advice.",
    "publisher": {
        "name": "EMG Guide (menios GmbH)",
        "url": "https://emgguide.de/"
    },
    "dateModified": "2026-10-21"
}