Contents
ANATOMY
Position
- Deep compared to the Trapezius
- Superficial compared to the Splenius Capitis and Cervicis, Serratus Posterior Superior and the Erector Spinae group
Origin
- Rhomboideus minor
- Processus spinosi C7-Th1
- Rhomboideus major
- Processus spinosi Th2-Th5
Insertion
- Margo mediale scapulae (from the root of the spina scapula towards the angulus inferiorscapulae)
Main function
- Scapula
- Retraction/adduction
- Elevation
Secondary function
- Scapula: Downward rotation
- Trunk: Contralateral rotation (when the scapula is fixated)
Nerve innervation
- Segmental: C4-C5
- Peripheral: Dorsal scapular nerve
Arterial supply
- Dorsal scapular artery
Referred pain pattern
Muscle type
- Phasic
- Weakens during dysfunction
Symptoms
- Round shouldered posture
- Problems reaching forward or stretching down
- Crepitation sounds when moving scapula
Videos
Short version
Detailed version
Myofascial lines
Deep dorsal arm line
- Levator scapula
- Supraspinatus, Infraspinatus, Subscapularis and Teres Minor
- Triceps brachii
- Ulnar periosteum
- Ulnar collateral ligaments
- Hypothenar muscles
Spiral line
- Splenius capitis and cervicis
- Rhomboideus major and minor
- Serratus anterior
- External oblique, abdominal aponeurosis, linea alba
- Internal oblique
- Tensor fascia latae
- Iliotibial tract
- Tibialis anterior
- Peroneus longus
- Biceps femoris
- Sacrotuerous ligament
- Sacrolumbar fascia
- Erector spinae
Synergists
Retraction
- Trapezius
- Levator Scapulae
Elevation
- Trapezius (upper)
- Levator Scapulae
- Serratus Anterior
- Pectoralis Major
Antagonists
Protraction scapula
- Serratus Anterior
- Pectoralis Minor
- Pectoralis Major
Depression scapula
- Trapezius (nedre)
- Pectoralis Minor
- Latissimus Dorsi
- Pectoralis Major
- Serratus Anterior