{
    "@context": "https://schema.org",
    "@type": "Dataset",
    "name": "M. Deltoideus Pars Spinalis — surface EMG electrode placement",
    "id": "deltoideus_posterior_r",
    "slug": "deltoideus-posterior-r",
    "url": {
        "en": "https://emgguide.de/muscle/deltoideus-posterior-r",
        "de": "https://emgguide.de/de/muscle/deltoideus-posterior-r",
        "viewer3d": "https://emgguide.de/?muscle=deltoideus_posterior_r",
        "json": "https://emgguide.de/muscle/deltoideus-posterior-r.json"
    },
    "names": {
        "latin": "M. Deltoideus Pars Spinalis",
        "en": "Posterior Deltoid",
        "de": "Hinterer Deltamuskel"
    },
    "side": "right",
    "region": {
        "key": "SHOULDER",
        "en": "Shoulder",
        "de": "Schulter"
    },
    "placementStandard": "SENIAM (Hermens et al. 2000)",
    "source": {
        "url": "http://seniam.org/deltoideusposterior.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 finger widths behind the acromial angle",
            "de": "2 Fingerbreiten hinter dem Acromionwinkel"
        },
        "orientation": {
            "en": "Toward acromion–little finger",
            "de": "Richtung Acromion–kleiner Finger"
        },
        "sensorRules": "bipolar Ag/AgCl, ≤ 10 mm conductive diameter, 20 mm inter-electrode distance, parallel to fibres, reference electrode on bone (SENIAM)"
    },
    "landmarks": {
        "rule": "electrode relative to landmark a (see note)",
        "a": {
            "id": "acromial_angle",
            "en": "Acromial angle",
            "de": "Akromionwinkel",
            "model_xyz_m": null
        },
        "b": null,
        "t": null,
        "extra": null,
        "note": {
            "en": "2 finger widths behind",
            "de": "2 Fingerbreiten dahinter"
        },
        "coordinates": "model space of the 3D viewer (metres, y up); for orientation only, not body measurements"
    },
    "anatomy": {
        "function": {
            "en": "Retroversion (extension), external rotation and horizontal abduction at shoulder joint",
            "de": "Retroversion (Extension), Außenrotation und Horizontalabduktion im Schultergelenk"
        },
        "origin": {
            "en": "Spine of scapula (inferior border)",
            "de": "Spina scapulae (unterer Rand)"
        },
        "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": "Move arm backward (extension) against resistance",
        "de": "Arm nach hinten führen (Extension) gegen Widerstand"
    },
    "placementNotes": {
        "source": "Criswell E. Cram's Introduction to Surface Electromyography. 2nd ed. Jones & Bartlett; 2011, p. 306",
        "site": "Posterior Deltoid",
        "placementType": "specific",
        "signalCheck": {
            "de": "Arm strecken (Extension), abduzieren oder außenrotieren.",
            "en": "Extend, abduct or laterally rotate the arm."
        },
        "crosstalk": {
            "de": [
                "mittlerer Deltoideus",
                "Infraspinatus",
                "Teres major",
                "Triceps brachii"
            ],
            "en": [
                "middle deltoid",
                "infraspinatus",
                "teres major",
                "triceps brachii"
            ]
        },
        "artifacts": null
    },
    "mvcTest": {
        "source": "Konrad P. The ABC of EMG. Noraxon; 2005, p. 31",
        "group": "deltoid_posterior",
        "en": {
            "position": "Seated with the trunk supported, arm at about 90° flexion or prone on a bench with the arm hanging.",
            "fixation": "Trunk fixed; upper arm fixed near the test position.",
            "resistance": "Manual resistance or strap against the back of the upper arm, extension / horizontal abduction against it.",
            "control": "Compare with the horizontal-abduction test used for the middle trapezius and rhomboids.",
            "note": "Konrad recommends a flexion/extension position for the spinal part of the deltoid; the posterior part shares the horizontal-abduction test of the shoulder stabilisers."
        },
        "de": {
            "position": "Sitzend mit gestütztem Rumpf, Arm etwa 90° flektiert, oder Bauchlage auf der Bank mit hängendem Arm.",
            "fixation": "Rumpf fixiert; Oberarm nahe der Testposition fixiert.",
            "resistance": "Manueller Widerstand oder Gurt an der Rückseite des Oberarms, Extension / horizontale Abduktion dagegen.",
            "control": "Mit dem Horizontal-Abduktionstest für mittleren Trapezius und Rhomboiden vergleichen.",
            "note": "Konrad empfiehlt für die Pars spinalis eine Flexions-/Extensionsposition; der hintere Anteil teilt sich den Horizontal-Abduktionstest der Schulterstabilisatoren."
        }
    },
    "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"
}