Podcast
Questions and Answers
What is the origin of the trapezius muscle?
What is the origin of the trapezius muscle?
Which fibers of the trapezius are responsible for retracting the scapula?
Which fibers of the trapezius are responsible for retracting the scapula?
What is a notable consequence of trapezius paralysis?
What is a notable consequence of trapezius paralysis?
Which nerve supplies motor function to the trapezius muscle?
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?
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.
