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Questions and Answers
Which muscle assists in flexing the thumb metacarpophalangeal and carpometacarpal joints, and may also assist in flexing the wrist?
Which muscle assists in flexing the thumb metacarpophalangeal and carpometacarpal joints, and may also assist in flexing the wrist?
Which nerve supplies the Flexor Pollicis Longus muscle?
Which nerve supplies the Flexor Pollicis Longus muscle?
What is the effect of marked weakness in the Flexor Pollicis Longus muscle?
What is the effect of marked weakness in the Flexor Pollicis Longus muscle?
What is the range of motion for thumb-metacarpophalangeal joint flexion?
What is the range of motion for thumb-metacarpophalangeal joint flexion?
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What is the origin of the Superficial Head of Flexor Pollicis Brevis?
What is the origin of the Superficial Head of Flexor Pollicis Brevis?
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Study Notes
Flexor Pollicis Longus Muscle
- The Flexor Pollicis Longus muscle assists with flexing the thumb's metacarpophalangeal and carpometacarpal joints.
- This muscle also contributes to wrist flexion.
- The median nerve supplies the Flexor Pollicis Longus muscle.
- Marked weakness in the Flexor Pollicis Longus muscle can result in difficulty flexing the thumb, especially when opposing it against resistance.
- Loss of strength can also affect gripping and pinching motions.
Thumb Metacarpophalangeal Joint Flexion
- The range of motion (ROM) for thumb metacarpophalangeal joint flexion is 70-90 degrees.
Flexor Pollicis Brevis Muscle
- The superficial head of the Flexor Pollicis Brevis muscle originates from the flexor retinaculum and the trapezium.
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Description
Test your knowledge of the anatomy and functions of the flexor pollicis longus and flexor pollicis brevis muscles in the thumb. Identify their origins, insertions, nerve supplies, and actions.
