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Human Anatomy: Extensor Retinaculum and Adductor Pollicis

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Human Anatomy: Extensor Retinaculum and Adductor Pollicis

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Questions and Answers

What is the primary function of the extensor retinaculum?

To stabilize the wrist during rotation

To provide muscle attachment

To flex the wrist

To hold the long extensor tendons in position (correct)

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.

extensor Signup and view all the answers

Match the following anatomical structures with their descriptions:

Extensor Retinaculum = Thickening of deep fascia at the back of the wrist Flexor Retinaculum = Structure that holds flexor tendons in place Tendons = Connect muscle to bone Ligament = Connect bone to bone Signup and view all the answers

What is the primary function of the extensor in the arm?

To convert grooves into tunnels for tendons Signup and view all the answers

The extensor is located on the anterior surface of the radius and ulna.

False Signup and view all the answers

What structures do the extensor tendons pass through?

Tunnels created by grooves on the retinaculum Signup and view all the answers

The extensor converts the grooves on the retinaculum into __________ for the passage of the long extensor tendons.

tunnels Signup and view all the answers

Match the following anatomical structures with their descriptions:

Extensor = Converts grooves into tunnels Retinaculum = Supports tendons at the wrist Radius = One of the forearm bones Ulna = Another bone in the forearm Signup and view all the answers

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.