Multiple Choice
In terms of origin and insertion, where is the origin of the frontalis muscle (frontal belly of the occipitofrontalis)?
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10. Muscles
Origin and Insertion
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Which of the following adducts the fingers and wrist?
A
extensor digitorum
B
flexor carpi radialis
C
flexor carpi ulnaris
D
extensor carpi radialis longus
Verified step by step guidance1
Understand the term 'adducts': In anatomy, 'adduction' refers to the movement of a body part toward the body's midline. For fingers and wrist, adduction means moving them closer to the center of the body.
Identify the muscles involved: The problem lists four muscles: extensor digitorum, flexor carpi radialis, flexor carpi ulnaris, and extensor carpi radialis longus.
Analyze the function of each muscle:
- Extensor digitorum: Primarily extends the fingers and wrist.
- Flexor carpi radialis: Flexes and abducts the wrist.
- Flexor carpi ulnaris: Flexes and adducts the wrist.
- Extensor carpi radialis longus: Extends and abducts the wrist.
Focus on the muscle that adducts: From the analysis, the flexor carpi ulnaris is the muscle that adducts the wrist, moving it toward the body's midline.
Conclude with the correct answer: Based on the functions, the flexor carpi ulnaris is the muscle that adducts the fingers and wrist, aligning with the correct answer provided.
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