{
    "@context": "https://schema.org",
    "@type": "Dataset",
    "name": "M. Deltoideus Pars Acromialis — surface EMG electrode placement",
    "id": "deltoideus_medius_l",
    "slug": "deltoideus-medius-l",
    "url": {
        "en": "https://emgguide.de/muscle/deltoideus-medius-l",
        "de": "https://emgguide.de/de/muscle/deltoideus-medius-l",
        "viewer3d": "https://emgguide.de/?muscle=deltoideus_medius_l",
        "json": "https://emgguide.de/muscle/deltoideus-medius-l.json"
    },
    "names": {
        "latin": "M. Deltoideus Pars Acromialis",
        "en": "Middle Deltoid",
        "de": "Mittlerer Deltamuskel"
    },
    "side": "left",
    "region": {
        "key": "SHOULDER",
        "en": "Shoulder",
        "de": "Schulter"
    },
    "placementStandard": "SENIAM (Hermens et al. 2000)",
    "source": {
        "url": "http://seniam.org/deltoideusmedius.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": "On the line acromion–lateral epicondyle, at the greatest bulge of the muscle",
            "de": "Auf der Linie Acromion–Epicondylus lateralis, an der größten Wölbung des Muskels"
        },
        "orientation": {
            "en": "Along the line acromion–hand",
            "de": "Richtung Linie Acromion–Hand"
        },
        "sensorRules": "bipolar Ag/AgCl, ≤ 10 mm conductive diameter, 20 mm inter-electrode distance, parallel to fibres, reference electrode on bone (SENIAM)"
    },
    "landmarks": {
        "rule": "electrode on the line from a to b (see note)",
        "a": {
            "id": "acromion",
            "en": "Acromion",
            "de": "Akromion",
            "model_xyz_m": null
        },
        "b": {
            "id": "lateral_epicondyle_humerus",
            "en": "Lateral epicondyle (humerus)",
            "de": "Epicondylus lateralis (Humerus)",
            "model_xyz_m": null
        },
        "t": null,
        "extra": null,
        "note": {
            "en": "at the greatest bulge of the muscle",
            "de": "an der größten Wölbung des Muskels"
        },
        "coordinates": "model space of the 3D viewer (metres, y up); for orientation only, not body measurements"
    },
    "anatomy": {
        "function": {
            "en": "Abduction at shoulder joint (from 15 degrees)",
            "de": "Abduktion im Schultergelenk (ab 15°)"
        },
        "origin": {
            "en": "Acromion",
            "de": "Acromion"
        },
        "insertion": {
            "en": "Deltoid tuberosity of humerus",
            "de": "Tuberositas deltoidea des Humerus"
        },
        "innervation": {
            "en": "Axillary nerve (posterior cord), C5–C6",
            "de": "N. axillaris (Fasciculus posterior), C5–C6"
        }
    },
    "testMovement": {
        "en": "Raise arm laterally (abduction 90 degrees) against resistance",
        "de": "Arm seitlich anheben (Abduktion 90°) gegen Widerstand"
    },
    "placementNotes": {
        "source": "Criswell E. Cram's Introduction to Surface Electromyography. 2nd ed. Jones & Bartlett; 2011, p. 305",
        "site": "Middle Deltoid",
        "placementType": "specific",
        "signalCheck": {
            "de": "Arm abduzieren.",
            "en": "Abduct the arm."
        },
        "crosstalk": {
            "de": [
                "vorderer und hinterer Deltoideus",
                "Biceps brachii",
                "Triceps brachii"
            ],
            "en": [
                "anterior and posterior deltoid",
                "biceps brachii",
                "triceps brachii"
            ]
        },
        "artifacts": null
    },
    "mvcTest": {
        "source": "Konrad P. The ABC of EMG. Noraxon; 2005, p. 31",
        "group": "deltoid_abduction",
        "en": {
            "position": "Seated, if possible with the back supported, both arms abducted to about 90°.",
            "fixation": "Arms fixed near the 90° position with straps; bilateral contraction keeps the trunk load balanced.",
            "resistance": "Fixed straps or bar above the elbows, abduction against them.",
            "control": "—",
            "note": "Abduction works best for the acromial (middle) part; for the clavicular part consider a flexion position, for the spinal part an extension position."
        },
        "de": {
            "position": "Sitzend, möglichst mit gestütztem Rücken, beide Arme etwa 90° abduziert.",
            "fixation": "Arme nahe der 90°-Position mit Gurten fixiert; die beidseitige Kontraktion hält die Rumpfbelastung symmetrisch.",
            "resistance": "Fixierte Gurte oder Stange über den Ellbogen, Abduktion dagegen.",
            "control": "—",
            "note": "Die Abduktion passt am besten zur Pars acromialis (mittlerer Anteil); für die Pars clavicularis eine Flexions-, für die Pars spinalis eine Extensionsposition erwägen."
        }
    },
    "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": "2026-09-24"
}