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Muscle
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 Click on image for larger view |
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Name
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Deltoideus
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Subdivision
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Anterior
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Muscle Anatomy
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Origin
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Anterior border, superior surface , lateral 1/3
of clavicle.
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Insertion
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Deltoid tuberosity of humerus.
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Function
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Abduction of shoulder joint, performed chiefly by
the middle fibers with stabilization by the anterior and posterior
fibers. In addition the anterior fibers flex and medially rotate
the shoulder joint.
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Recommended sensor placement procedure
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Starting posture
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Sitting with the arms hanging vertically and the
palm pointing inwards.
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Electrode size
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Maximum size in the direction of the muscle fibers:
10 mm.
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Electrode distance
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20 mm
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Electrode placement
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- location
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The electrodes need to be placed at one finger width
distal and anterior to the acromion.
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- orientation
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In the direction of the line between the acromion
and the thumb.
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- fixation on the skin
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(Double sided) tape / rings.
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- reference electrode
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On the proc. spin. of C7 or on / around the wrist.
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Clinical test
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Shoulder abduction in slight flexion, with the humerus
in slight rotation. In the erect sitting position it is necessary
to place the humerus in slight lateral rotation to increase the
effect of gravity on the anterior fibres. The anatomical action
of the anterior deltoideus entails slight medial rotation while
pressure is applied against the antero medial surface of the arm
in the direction of adduction and slight extension.
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Remarks
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The SENIAM guidelines include a separate sensor
placement procedure for the deltoideus posterior and the deltoideus
medius muscle.
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