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Shoulder Girdle
Term | Definition |
---|---|
Upper Trapezius- Origin | Occipital bone, nuchal ligament on upper cervical spinous processes |
Upper Trapezius- Insertion | Lateral 1/3 of clavicle; medial aspect of acromion process of scapula |
Upper Trapezius- Nerve innervation | Spinal accessory nerve (cranial nerve XI); C3-C4 sensory component |
Upper Trapezius- Action | *Scapular elevation *Upward rotation |
Middle Trapezius- Origin | Spinous processes of C7-T3 |
Middle Trapezius- Insertion | Scapular spine |
Middle Trapezius- Nerve Innervation | Spinal accessory nerve (cranial nerve XI); C3-C4 sensory component |
Middle Trapezius- Action | Scapular retraction |
Lower Trapezius- Origin | Spinous processes of middle & lower thoracic vertebrae |
Lower Trapezius- Insertion | Base of scapular spine |
Lower Trapezius- Nerve innervation | Spinal accessory nerve (cranial nerve XI); C3 & C4 sensory component |
Lower Trapezius- Action | *Scapular depression & upward rotation |
Levator Scapula- Origin | Transverse processes of C1-C4 |
Levator Scapula- Insertion | Superior part of vertebral border of scapula |
Levator Scapula- Nerve Innervation | C3, C4, & dorsal scapular nerve (C5) |
Levator Scapula- Action | *Scapular elevation *Downward rotation |
Rhomboid- Origin | Major: Spinous processes of T2- T5 Minor: Ligamentum nuchae & spinous processes of C7 & T1 |
Rhomboid- Insertion | Major: Vertebral border of scapula from inferior to scapular spine to inferior angle Minor: Vertebral border of scapula; adjacent to scapular spine |
Rhomboid- Nerve Innervation | Dorsal scapular nerve (C5) |
Rhomboid- Action | *Scapular retraction, elevation, & downward rotation |
Serratus Anterior- Origin | Lateral surface of upper 8 ribs |
Serratus Anterior- Insertion | Anterior surface of vertebral border of scapula |
Serratus Anterior- Nerve Innervation | Long thoracic nerve (C5,6,7) |
Serratus Anterior- Action | *Scapular protraction & upward rotation |
Pectoralis- Origin | Anterior surface of 3rd -5th ribs |
Pectoralis- Insertion | Coracoid process of scapula |
Pectoralis- Nerve Innervation | Medial pectoral nerve (C8, T1 |
Pectoralis- Action | *Scapular depression *Protraction *Downward rotation Anterior tilt of scapula |