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Questions and Answers
What is the origin of the trapezius muscle?
Which fibers of the trapezius are responsible for retracting the scapula?
What is a notable consequence of trapezius paralysis?
Which nerve supplies motor function to the trapezius muscle?
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Which action is primarily performed by the upper fibers of the trapezius muscle?
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Study Notes
Trapezius
- Large triangular muscle covering upper back
- Forms trapezium shape with opposing muscle
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Origin:
- External occipital protuberance and superior nuchal line
- Ligamentum nuchae and C7 vertebra spine
- Thoracic vertebrae spines and supraspinous ligaments
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Insertion:
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V-shaped:
- Upper fibres: Lateral third of clavicle posterior border
- Middle fibres: Acromion medial border and spine of scapula crest upper lip
- Lower fibres: Tubercle on spine of scapula crest near root
- Deltoid muscle's v-shaped origin surrounds trapezius insertion
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V-shaped:
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Nerve supply:
- Motor: Accessory nerve spinal root
- Sensory: Cervical nerves C3 and C4
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Action:
- Maintains shoulder level
- Upper fibres elevate shoulder girdle
- Upper and lower fibres rotate scapula for overhead arm placement
- Middle fibres retract scapula and brace shoulder with rhomboids
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Applied anatomy:
- Trapezius paralysis results in shoulder drop
Latissimus Dorsi
- Large triangular flat muscle covering lower back to iliac crest
- Wide origin, narrow insertion tendon
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Description
This quiz covers the anatomy and functions of the trapezius muscle, including its origin, insertion, nerve supply, and actions. Test your understanding of this large triangular muscle that plays a critical role in shoulder movement and stability.
