Carpal Tunnel Flashcards

1
Q

What is the carpal tunnel?

A

A narrow passageway found on the anterior portion of the wrist

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2
Q

What does the carpal tunnel serve as?

A

The entrance to the palm for several tendons and the median nerve

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3
Q

What is the carpal tunnel formed by?

A

Two layers, a deep carpal arch, and a superficial flexor retinaculum

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4
Q

What does the deep carpal arch form?

A

A concave surface, which is converted into a tunnel

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5
Q

How is the deep carpal arch converted into a tunnel?

A

By the overlying flexor retinaculum

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6
Q

What shape is the carpal arch?

A

Concave on the palmar side

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7
Q

What is the carpal arch formed by?

A

Laterally by scaphoid and trapezium tubercles

Medially by hook of hamate and pisiform

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8
Q

What is the flexor retinaculum?

A

Thick connective tissue

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9
Q

What does the flexor retinaculum do?

A

Turns the carpal arch into the carpal tunnel by bridging the space between medial and lateral parts of the arch

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10
Q

Where does the flexor retinaculum originate?

A

On the lateral side

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11
Q

Where does the flexor retinaculum insert?

A

On the medial side of the carpal arch

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12
Q

What does the carpal tunnel?

A

9 tendons, surrounded by synovial sheaths, and the median nerve

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13
Q

What tendons does the carpal tunnel contain?

A

The tendon of the flexor pollicis longus
4 tenson of the flexor digitorum profundus
4 tendons of the flexor digitorum superficialis

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14
Q

What are the 8 tendons of the flexor digitorum profundus and superficialis surrounded by?

A

A single synovial sheath

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15
Q

What is the tendon of the flexor pollicis longus surrounded by?

A

It’s own synovial sheath

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16
Q

What do the synovial sheaths of the tendons in the carpal tunnel allow for?

A

Free movement of the tendons

17
Q

What happens once the median nerve passes through the carpal tunnel?

A

It divides into two branches, the recurrent branch and the palmar digital nerves

18
Q

What do the palmar digital nerves give?

A

Sensory innervation to the palmar skin and dorsal nail beds of the lateral three and a half digits
Motor innervation to the lateral two lumbricals

19
Q

What does the recurrent branch of the median nerve supply?

A

The thenar muscle group