UPPER-MIDDLE-LOWER TRAPEZIUS, RHOMBOIDS, LEVATOR SCAPULAE
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4 SUBDIVISIONS of the TRAPEZIUS
· There are 4 Parts to the Trapezius – CLICK HERE – source: Hamilton and Luttgens
Trapezius I
Origin: Occipital bone; ligamentum nuchae; Insertion: Posterior border of lateral third of clavicle
Action: Elevation of the Scapula
Action: Extension, Lateral Flexion, Rotation of the Neck
Trapezius II
Origin: Ligamentum nuchae; Insertion: Top of acromion process
Action: Elevation; Upward Rotation; Ad-duction (Retraction) of the Scapula
Trapezius III
Origin: Spinous processes of seventh cervical and upper three thoracic vertebrae; Insertion: Upper border of scapular spine
Action: Ad-duction (Retraction) of the Scapula
Trapezius IV
Origin: Spinous processes of fourth through twelfth thoracic vertebrae; Insertion: Root of scapular spine
Action: Upward Rotation; Depression; Ad-duction (Retraction) of the Scapula
Selective activation of neuromuscular compartments within the human trapezius muscle – 2009 – Holtermann
Procedure
– There are Task-dependent differences in relative activity b/n “functional” subdivisions within muscles
– Independent voluntary control of anatomical neuromuscular subdivisions is not observed
Electrodes
– Bipolar electromyographical electrodes were situated on 4 subdivisions of the trapezius muscle
Results
(1) All subjects managed to voluntarily activate the lower subdivisions independently from the upper subdivisions.
(2) Half of the subjects succeeded to voluntarily activate both upper subdivisions independently from the two lower subdivisions.
EMG STUDIES – REHAB EXERCISES
UPPER-MIDDLE-LOWER TRAPS, RHOMBOID, LEVATOR & SERRATUS ANTERIOR, PEC MINOR
– Scaption, Towel Wall Slide, Banded Elevation with External Rotation
Superficial and Deep Scapulothoracic Muscle EMG Activity During Different Types of Elevation Exercises in the Scapular Plane – 2015 – Castelain
Results for Exercises with Load
Serratus Anterior: scaption 55 – towel wall slide 50 – elevation with external rotation thera-band 45
Pectoralis Minor: towel wall slide 40 – scaption 30 – elevation with external rotation thera-band 25
+ Upper Trapezius: scaption 40 – towel wall slide 35 – elevation with external rotation thera-band 30
+ Middle Trapezius: scaption 25 – elevation with external rotation thera-band 25 – towel wall slide 15
+ Lower Trapezius: elevation with external rotation thera-band 30 – scaption 25 – towel wall slide 15
+ Rhomboid Major: towel wall slide 40 – scaption 40 – elevation with external rotation thera-band 25
+ Levator Scapulae: scaption 35 – elevation with external rotation thera-band 30 – towel wall slide 25
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