{
    "@context": "https://schema.org",
    "@type": "Dataset",
    "name": "M. Trapezius Pars Ascendens — surface EMG electrode placement",
    "id": "trapezius_ascendens_r",
    "slug": "trapezius-ascendens-r",
    "url": {
        "en": "https://emgguide.de/muscle/trapezius-ascendens-r",
        "de": "https://emgguide.de/de/muscle/trapezius-ascendens-r",
        "viewer3d": "https://emgguide.de/?muscle=trapezius_ascendens_r",
        "json": "https://emgguide.de/muscle/trapezius-ascendens-r.json"
    },
    "names": {
        "latin": "M. Trapezius Pars Ascendens",
        "en": "Lower Trapezius",
        "de": "Unterer Trapezmuskel"
    },
    "side": "right",
    "region": {
        "key": "SHOULDER",
        "en": "Shoulder",
        "de": "Schulter"
    },
    "placementStandard": "SENIAM (Hermens et al. 2000)",
    "source": {
        "url": "http://seniam.org/trapeziusascendens.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": "2/3 on line from trigonum spinae to T8",
            "de": "2/3 auf Linie von Trigonum spinae zu T8"
        },
        "orientation": {
            "en": "Along the line T8–acromion",
            "de": "Richtung Linie T8–Acromion"
        },
        "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": "trigonum_spinae",
            "en": "Trigonum spinae (root of scapular spine)",
            "de": "Trigonum spinae (Wurzel der Spina scapulae)",
            "model_xyz_m": null
        },
        "b": {
            "id": "t8",
            "en": "T8 spinous process",
            "de": "Dornfortsatz T8",
            "model_xyz_m": null
        },
        "t": 0.66669999999999995932142837773426435887813568115234375,
        "extra": null,
        "note": null,
        "coordinates": "model space of the 3D viewer (metres, y up); for orientation only, not body measurements"
    },
    "anatomy": {
        "function": {
            "en": "Depression and upward rotation of scapula, retraction",
            "de": "Depression und Aufwärtsrotation der Scapula, Retraktion"
        },
        "origin": {
            "en": "Proc. spinosi Th5–Th12",
            "de": "Proc. spinosi Th5–Th12"
        },
        "insertion": {
            "en": "Spine of scapula (medial third)",
            "de": "Spina scapulae (mediales Drittel)"
        },
        "innervation": {
            "en": "Spinal accessory nerve (spinal portion) with twigs from C3–C4",
            "de": "N. accessorius (Pars spinalis) mit Ästen aus C3–C4"
        }
    },
    "testMovement": {
        "en": "Raise arm overhead, scapula depresses downward-medially",
        "de": "Arm über Kopf heben, Schulterblatt senkt sich nach unten-innen"
    },
    "placementNotes": {
        "source": "Criswell E. Cram's Introduction to Surface Electromyography. 2nd ed. Jones & Bartlett; 2011, p. 293",
        "site": "Lower Interscapular (Lower Trapezius)",
        "placementType": "quasi-specific",
        "signalCheck": {
            "de": "Arme abduzieren; Schulter nach hinten-unten (45°) ziehen.",
            "en": "Abduct the arms; retract the shoulder back and down at 45°."
        },
        "crosstalk": {
            "de": [
                "mittlerer Trapezius",
                "Rhomboiden",
                "Erector spinae"
            ],
            "en": [
                "middle trapezius",
                "rhomboids",
                "erector spinae"
            ]
        },
        "artifacts": {
            "de": "EKG und Atmung.",
            "en": "ECG and breathing."
        }
    },
    "mvcTest": {
        "source": "Konrad P. The ABC of EMG. Noraxon; 2005, p. 31",
        "group": "pull_up",
        "en": {
            "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": "The same set-up may also produce maxima for the biceps and the lower trapezius.",
            "note": "The pull-up simulation produces the highest latissimus innervation; the lower trapezius and teres major share the set-up."
        },
        "de": {
            "position": "Simulierter Klimmzug: Ellbogen etwa 90° gebeugt, frontale und seitliche Armposition prüfen.",
            "fixation": "Fixierte Stange oder Gerät; Rumpf stabilisiert.",
            "resistance": "Zug gegen die fixierte Stange.",
            "control": "Derselbe Aufbau kann auch Maxima für Biceps und unteren Trapezius liefern.",
            "note": "Die Klimmzug-Simulation erzeugt die höchste Latissimus-Innervation; unterer Trapezius und Teres major teilen sich den Aufbau."
        }
    },
    "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"
}