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What is the primary function of the extensor retinaculum?
The extensor retinaculum is located on the front of the wrist.
False
What type of tissue is the extensor retinaculum primarily composed of?
Deep fascia
The extensor retinaculum is responsible for holding the long ______ tendons in position.
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Match the following anatomical structures with their descriptions:
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What is the primary function of the extensor in the arm?
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The extensor is located on the anterior surface of the radius and ulna.
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What structures do the extensor tendons pass through?
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The extensor converts the grooves on the retinaculum into __________ for the passage of the long extensor tendons.
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Match the following anatomical structures with their descriptions:
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Study Notes
Extensor Retinaculum
- Thickening of deep fascia located at the back of the wrist.
- Holds long extensor tendons in position during movement.
- Converts grooves on the posterior surface of the radius and ulna into six separate tunnels for tendon passage.
- Lateral border is defined by the tendons of abductor pollicis longus and extensor pollicis brevis.
- Medial border is defined by the tendon of extensor pollicis longus.
- The floor of the impression is formed by the scaphoid and trapezium bones.
- The radial artery runs on the floor of the anatomical snuffbox.
- Function: Aids in the adduction of the thumb, index, ring, and little fingers at the metacarpophalangeal joints.
Adductor Pollicis
- Composed of two heads: transverse and oblique.
- Transverse head originates from the third metacarpal bone.
- Oblique head originates from the capitate bone and the bases of the second and third metacarpal bones.
- Plays a crucial role in adduction of the thumb.
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Description
Explore the anatomy of the Extensor Retinaculum and the Adductor Pollicis muscle. This quiz covers their definitions, functions, and anatomical relationships. Test your knowledge on these important structures in the human wrist and hand.