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Neurology of Carpal Tunnel Syndrome Example
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Carpal Tunnel Syndrome The carpal tunnel is a narrow tunnel that contains tendons and protects your median nerve, which controls feeling in your thumb, index, middle and ring fingers. The carpal tunnel runs under the ligament connecting the bones on either side of your wrist (Figure 1).
Carpal tunnel syndrome results when the tunnel becomes narrow due to swelling or inflammation of other ligaments and tendons in the wrist and the median nerve is squeezed against bone and ligament. (Figure 2). The resulting pressure causes pain and numbness in the hand (Figure 3). Symptoms
Usually start gradually; first appear during the night
Frequent burning, tingling, or itching numbness in the palm of the hand and the fingers, especially the thumb and the index and middle fingers
Fingers feel useless and swollen, but with little or no apparent swelling
Wake up feeling the need to "shake out" the hand or wrist
Decreased grip strength
Muscles at the base of the thumb may waste away
Inability to differentiate between hot and cold by touch Causes
Combination of factors that increase pressure on the median nerve and tendons in the carpal tunnel
Wear, tear and swelling of the tendons from overuse
Common in jobs or hobbies requiring repeated hand motions, such as assembly workers, beauticians, data-entry operators, cooks, musicians & racquet sports
Congenital predisposition to a smaller carpal tunnel
Trauma or injury to the wrist that cause swelling, such as sprain or fracture
Over-activity of the pituitary gland
Hypothyroidism
Rheumatoid arthritis
Mechanical problems in the wrist joint; work stress
Repeated use of vibrating hand tools
Fluid retention during pregnancy or menopause
Development of a cyst or tumor in the canal LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD
Carpal tunnel syndrome results when the tunnel becomes narrow due to swelling or inflammation of other ligaments and tendons in the wrist and the median nerve is squeezed against bone and ligament. (Figure 2). The resulting pressure causes pain and numbness in the hand (Figure 3). Symptoms
Usually start gradually; first appear during the night
Frequent burning, tingling, or itching numbness in the palm of the hand and the fingers, especially the thumb and the index and middle fingers
Fingers feel useless and swollen, but with little or no apparent swelling
Wake up feeling the need to "shake out" the hand or wrist
Decreased grip strength
Muscles at the base of the thumb may waste away
Inability to differentiate between hot and cold by touch Causes
Combination of factors that increase pressure on the median nerve and tendons in the carpal tunnel
Wear, tear and swelling of the tendons from overuse
Common in jobs or hobbies requiring repeated hand motions, such as assembly workers, beauticians, data-entry operators, cooks, musicians & racquet sports
Congenital predisposition to a smaller carpal tunnel
Trauma or injury to the wrist that cause swelling, such as sprain or fracture
Over-activity of the pituitary gland
Hypothyroidism
Rheumatoid arthritis
Mechanical problems in the wrist joint; work stress
Repeated use of vibrating hand tools
Fluid retention during pregnancy or menopause
Development of a cyst or tumor in the canal LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD