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ANAT 525
Muscles of the Back
6
Anatomy
Graduate
06/25/2011

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Cards

Term
Origin of Trapezius
Definition

1. Medial 1/3 of the superior nuchal line of the occipital bone

2. External occipital protuberance

3. Ligamentum nuchae

4. 7th cervical and all the thoracic vertebral spinous processes and the corresponding supraspinous ligaments

Term
Insertion of Trapezius
Definition

1. Lateral 1/3 of the clavicle (superior fibers)

2. Acromion process, spine of the scapula (middle fibers)

3. Base of scapular spine (inferior fibers)

Term
Innervation of Trapezius
Definition

1. Spinal part of accessory nerve (C.N. 11)

2. Ventral rami of 3rd and 4th cervical nerves

 

Term
Function of Trapezius
Definition

1. Lower trapezius draws the scapula down

2. Middle trapezius adducts the scapula

3. Upper trapezius draws the scapular upward

4. Rotation of scapula; upper and lower fibers work together in force couple to upwardly rotate the scapula

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