Abduction 

Downward Rotation

Depression

Anterior Surface 

of 

the 3rd to 5th Ribs

Pectoralis Minor Insertion

Coracoid Process

of Scapula

Serratus Anterior

Actions

Abduction 

Upward Rotation

Surface of the Upper

9 Ribs at the side

of the chest

Serratus Anterior Insertion

Anterior aspect of the whole

length of the medial

border of the scapula

Trapezius (upper figbers)

Actions

Elevation

Extension of head

Rotation of head

Trapezius Origin

(upper fibers)

Base of Skull

Occipital Protuberance

Posterior ligaments of Neck

Trapezius Insertion

(upper fibers)

Posterior aspect of the lateral

3rd of the clavicle

Trapezius Actions

(middle fibers)

Elevation

Adduction

Upward Rotation

Trapezius Origin

(middle fibers)

Spinous process of 7th cervical

and upper 3 thoracic vertebrae

Trapezius Insertion

(middle fibers)

Medial border of the acromion

process and upper border of the scapular

spine

Trapezius Action

(lower fibers)

Adduction

Depression

Upward rotation

Trapezius Origin

(lower fibers)

Spinous process of 4th-12th

thoracic vertebrae

Trapezius Insertion

(lower fibers)

Triangular space at the base 

of scapular spine

Adduction 

Downward Rotation

Elevation

Spinous Process of 

the last cervical and the 

first 5 thoracic vertebrae

Medial border of the

scapusa, below the scapula spine

Levator Scapulae

Action

Levator Scapulae

Origin

Transverse processes of 

the upper 4 cervical vertebrae

Levator Scapulae

Insertion

Medial border of the

scapula

Innervation of Should Girdle

Muscles

Medial Pectoral Nerve

(C8-T1)

Long Thoracic Nerve

(C5-C7)

Spinal accessory Nerve

and 

Brances of C3 and C4

Dorsal Scapula Nerve C5

and

Brances of C3 and C4