|
Muscle
|
 Click on image for larger view |
|
|
Name
|
Deltoideus
|
|
|
Subdivision
|
Posterior
|
|
|
Muscle Anatomy
|
||
|
Origin
|
Inferior lip of posterior border of spine of scapula.
|
|
|
Insertion
|
Deltoid tuberosity of humerus.
|
|
|
Function
|
Abduction of shoulder joint, performed chiefly by
the middle fibres with stabilisation by the anterior and posterior
fibres. In addition the posterior fibres extend and laterally rotate.
|
|
|
Recommended sensor placement procedure
|
||
|
Starting posture
|
Erect sitting with the arms hanging vertically and
the palm of the hand pointing inwards.
|
|
|
Electrode size
|
Maximum size in the direction of the muscle fibers:
10 mm.
|
|
|
Electrode distance
|
20 mm
|
|
|
Electrode placement
|
||
|
- location
|
Center the electrodes in the area about two fingerbreaths
behind the angle of the acromion.
|
|
|
- orientation
|
In the direction of the line between the acromion
and the little finger.
|
|
|
- fixation on the skin
|
(Double sided) tape / rings.
|
|
|
- reference electrode
|
On the proc. spin. of C7 or on / round the wrist.
|
|
|
Clinical test
|
Abduct the shoulder in slight extension, with the
humerus in slight medial rotation. The humerus is placed in slight
medial rotation in order to have the posterior fibres in an anti-gravity
position. The anatomical action entails slight lateral rotation
while pressure is applied against the posterolateral surface of
the arm, above the elbow in the direction of adduction and slight
flexion.
|
|
|
Remarks
|
The SENIAM guidelines include a separate sensor
placement procedure for the deltoideus medius and the deltoideus
anterior muscle.
|
|