![]() ![]() ![]() If you’re affected by carpal tunnel syndrome, you may experience one or more of the following symptoms: PC gamers are at greater risk for carpal tunnel syndrome Signs and symptoms Direct pressure: direct pressure at the base of the palm may compress the structures within the carpal tunnel.Poor, prolonged wrist position: if the wrist is held in extension for long periods of time (e.g., wrists bent backwards on the edge of a keyboard), the flexor retinaculum is pulled tightly, putting pressure on the structures within the carpal tunnel.Direct compression of the flexor retinaculum or median nerve.Prolonged, static position: if the wrist is held in the same position for long periods of time, the flexor retinaculum may become tense, narrowing the space within the carpal tunnel.Overuse imbalance: repetitive movement in one plane of motion may cause densification or adhesion formation in the flexor retinaculum, shortening the band of tissue and narrowing the space within the carpal tunnel.Densification or adhesion formation in the flexor retinaculum.Hormones: changes in hormones (e.g., during pregnancy) may increase water retention increased fluid volume may increase pressure inside the carpal tunnel.Overuse: repetitive strain injuries such as tenosynovitis may create inflammation in the tendon sheaths which can cause crowding within the carpal tunnel.Injury: wrist injuries (sprains, strains, trauma, etc.) may cause inflammation which narrows the space within the carpal tunnel.The compression or irritation may be caused by: The median nerve DOES NOT provide touch sensation to your pinky finger, the lateral (pinky) side of your ring finger, or the majority of the back of your hand! PathophysiologyĬarpal tunnel syndrome occurs when there is compression or irritation of the median nerve within the carpal tunnel. On the back of your hand, only the tips of your thumb, index, and middle finger.The medial portion (thumb side) of your ring finger.The palm side of your thumb, index, middle finger.The cutaneous innervation (touch sensation) includes: The median nerve is also responsible for touch sensation for a large portion of your hand. Median nerve compression within the carpal tunnel-beneath the flexor retinaculum This muscle flexes (closes) your thumb, excluding the thumb tip.A portion of the flexor pollicis brevis.This muscle pulls your thumb away from your palm.This muscle creates opposition of your thumb (e.g., pinching).In your hand-beyond the carpal tunnel-the median nerve innervates 3 muscles: This tendon flexes (closes) your thumb, including the thumb tip.These tendons flex (close) your fingers, excluding the finger tips.Flexor digitorum superficialis (4 separate tendons).These tendons flex (close) your fingers, including the finger tips.Flexor digitorum profundus (4 separate tendons).“Carpal tunnel” is not a condition rather, carpal tunnel syndrome is the condition! Through this tunnel, 10 structures pass from your forearm into your hand: It is important to note that carpal tunnel is in reference to the normal, anatomical structures in your hands. The 8 carpal bones and the flexor retinaculum form the carpal tunnel. On the pinky side of your palm, it attaches to the pisiform and hamate bones. On the thumb side of your palm, it attaches to the scaphoid and trapezium bones. The 8 carpal bones viewed from the palm side of the handĪcross these bones is a band of fascia-a dense connective tissue-called the flexor retinaculum (often called the transverse carpal ligament). Distal: trapezium, trapezoid, capitate, hamate.Proximal: scaphoid, lunate, triquetrum, pisiform. ![]() The bones are listed from the thumb side to the pinky side of your hand with your palm facing upward. These bones are oriented in 2 rows, proximal (closer to your wrist) and distal (closer to your fingers). There are 8 carpal bones at the base of your hand-3 of which attach to your forearm and form the wrist joint. To begin, the word “ carpal” in carpal tunnel syndrome is in reference to the bones at the base of the hand.
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