{
    "@context": "https://schema.org",
    "@type": "Dataset",
    "name": "M. Triceps Brachii Caput Longum — surface EMG electrode placement",
    "id": "triceps_brachii_long_l",
    "slug": "triceps-brachii-long-l",
    "url": {
        "en": "https://emgguide.de/muscle/triceps-brachii-long-l",
        "de": "https://emgguide.de/de/muscle/triceps-brachii-long-l",
        "viewer3d": "https://emgguide.de/?muscle=triceps_brachii_long_l",
        "json": "https://emgguide.de/muscle/triceps-brachii-long-l.json"
    },
    "names": {
        "latin": "M. Triceps Brachii Caput Longum",
        "en": "Triceps Brachii (Long Head)",
        "de": "Langer Trizeps"
    },
    "side": "left",
    "region": {
        "key": "UPPER_ARM",
        "en": "Upper Arm",
        "de": "Oberarm"
    },
    "placementStandard": "SENIAM (Hermens et al. 2000)",
    "source": {
        "url": "http://seniam.org/tricepsbrachiilonghead.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 between posterior crest of the acromion and olecranon, 2 finger widths medial to the line",
            "de": "50% auf Linie zwischen hinterer Crista des Acromions und Olecranon, 2 Fingerbreiten medial der Linie"
        },
        "orientation": {
            "en": "Parallel to line posterior crest of the acromion–olecranon",
            "de": "Parallel zur Linie hintere Crista des Acromions–Olecranon"
        },
        "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": "acromial_angle",
            "en": "Acromial angle",
            "de": "Akromionwinkel",
            "model_xyz_m": null
        },
        "b": {
            "id": "olecranon",
            "en": "Olecranon",
            "de": "Olekranon",
            "model_xyz_m": null
        },
        "t": 0.5,
        "extra": null,
        "note": {
            "en": "2 finger widths medial of the line",
            "de": "2 Fingerbreiten medial der Linie"
        },
        "coordinates": "model space of the 3D viewer (metres, y up); for orientation only, not body measurements"
    },
    "anatomy": {
        "function": {
            "en": "Elbow extension, shoulder retroversion and adduction",
            "de": "Extension im Ellenbogen, Retroversion und Adduktion im Schultergelenk"
        },
        "origin": {
            "en": "Infraglenoid tubercle of the scapula",
            "de": "Tuberculum infraglenoidale der Scapula"
        },
        "insertion": {
            "en": "Olecranon of the ulna",
            "de": "Olecranon der Ulna"
        },
        "innervation": {
            "en": "Radial nerve (posterior cord), C7–T1",
            "de": "N. radialis (Fasciculus posterior), C7–T1"
        }
    },
    "testMovement": {
        "en": "Elbow extension against resistance with slightly retroverted arm",
        "de": "Ellenbogenextension gegen Widerstand bei leicht retrovertiertem Arm"
    },
    "placementNotes": {
        "source": "Criswell E. Cram's Introduction to Surface Electromyography. 2nd ed. Jones & Bartlett; 2011, p. 319",
        "site": "Triceps",
        "placementType": "specific",
        "signalCheck": {
            "de": "Unterarm gegen Widerstand strecken.",
            "en": "Extend the forearm against resistance."
        },
        "crosstalk": {
            "de": [
                "Biceps brachii",
                "hinterer und mittlerer Deltoideus"
            ],
            "en": [
                "biceps brachii",
                "posterior and middle deltoid"
            ]
        },
        "artifacts": null
    },
    "mvcTest": {
        "source": "Konrad P. The ABC of EMG. Noraxon; 2005, p. 31",
        "group": "triceps",
        "en": {
            "position": "Same set-up as the biceps test: seated or kneeling, elbow at about 90°, upper arm slightly abducted.",
            "fixation": "Elbow and trunk fixed as for the biceps.",
            "resistance": "Rigid resistance from above on the wrist (fixed bar or manual), elbow extension against it.",
            "control": "Use the pectoralis major test as a control exercise.",
            "note": "Konrad: \"same instruction as biceps\" — the only difference is the direction of resistance."
        },
        "de": {
            "position": "Gleicher Aufbau wie beim Biceps-Test: sitzend oder kniend, Ellbogen etwa 90°, Oberarm leicht abduziert.",
            "fixation": "Ellbogen und Rumpf fixiert wie beim Biceps.",
            "resistance": "Starrer Widerstand von oben auf dem Handgelenk (fester Bügel oder manuell), Ellbogenextension dagegen.",
            "control": "Als Kontrollübung den Pectoralis-major-Test mitlaufen lassen.",
            "note": "Konrad: „gleiche Anweisung wie Biceps\" — nur die Widerstandsrichtung ist umgekehrt."
        }
    },
    "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"
}