Palmar flexion is the movement of the hand at the wrist joint where the palm of the hand moves towards the inner forearm. It is essentially bending the wrist so the fingers point downwards.
In more detail:
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Definition: Palmar flexion, also known as wrist flexion, is the action of decreasing the angle between the palm of the hand and the anterior forearm. Think of it as bending your wrist forward.
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Anatomical Context: This movement occurs at the radiocarpal joint (wrist joint).
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Muscles Involved: Several muscles contribute to palmar flexion, including:
- Flexor carpi ulnaris
- Flexor carpi radialis
- Palmaris longus
- Flexor digitorum superficialis
- Flexor digitorum profundus
- Flexor pollicis longus
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Range of Motion: The normal range of palmar flexion varies, but is typically around 80-90 degrees.
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Example: Imagine holding a heavy bag with your arm extended down; your wrist will naturally go into palmar flexion to maintain your grip.
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Clinical Significance: Limitations in palmar flexion can indicate various conditions, such as:
- Wrist sprains or strains
- Arthritis
- Carpal tunnel syndrome
- Muscle imbalances
- Tendonitis
Therefore, palmar flexion is the anatomical term for the motion of bending your wrist forward, towards the palm.
