Scapular Retraction

Electrode Placement
Application Instruction by Dr. Lucinda Baker

Electrode placement for scapular retraction. The negative electrode is placed under the scapula as far as possible. The positive electrode is placed on the lower portion of the serratus anterior.

Scapular Retraction

Video Instruction
Audio Transcript:

Electrode placement for scapular retraction. The negative electrode is placed under the scapula as far as possible. The positive electrode is placed on the lower portion of the serratus anterior.

During the stimulation the scapula will retract against the thorax wall and the negative electrode will come over onto the superior surface of the scapula. Despite the relocation of the negative electrode the scapula will continue to retract.

Scapular Retraction

Muscle Anatomy

Muscles involved in shoulder flexion & abduction:

Deltoid
Origin: The anterior border and upper surface of the lateral third of the clavicle, acromion, spine of the scapula
Insertion: Deltoid tuberosity of humerus

Trapezius
Origin: External occipital protuberance, spinous processes of vertebrae C7-T12, nuchal ligament, medial third of superior nuchal line of the occipital bone.
Insertion: Nuchal ligament, medial superior nuchal line, posterior border of the lateral one-third of the clavicle, acromion process, and spine of scapula
Other actions: Scapular rotation, elevation, depression of the scapula

Rhomboideus Major
Origin: Spinous processes of the T2 to T5 vertebrae
Insertion: medial border of the scapula, inferior to the insertion of rhomboid minor muscle
Other actions: fixates the scapula to the thoracic wall

Rhomboideus Minor
Origin: Nuchal ligaments and spinous processes of C7-T1
Insertion: Medial border of scapula, superior to the insertion of rhomboid major muscle
Other actions: fixates the scapula to the thoracic wall

Serratus Anterior
Origin: Fleshy slips from the outer surface of upper 8 or 9 ribs
Insertion: Costal aspect of medial margin of the scapula
Other actions: Protracts and stabilizes scapula, assists in upward rotation

Scapular Retraction

Nerve Anatomy

Origin: Nerves involved in scapular retraction:

Trapezius
Nerve innervation: accessory nerve for motor cervical spinal nerves C3 and C4 for motor and sensation
Nerve root: C3, C4

Rhomboideus Major
Nerve innervation: dorsal scapular nerve
Nerve root: C4, C5, C6

Rhomboideus Minor
Nerve innervation: Dorsal scapular nerve
Nerve root: C4, C5, C6

Serratus Anterior
Nerve innervation: long thoracic nerve
Nerve root: C5, C6, C7