Question

multiple choice question

what is the function of a tendon sheath?

prevent overextension
provide insulation
prevent friction
provide strength to the attachment

Explanation:

Define tendon sheaths

Using the Tendon Function knowledge point
Tendon sheaths are elongated, double-layered cylindrical sacs wrapped around tendons subjected to high friction, particularly in the hands, wrists, ankles, and feet.

Analyze the primary function

These sheaths contain synovial fluid between their inner visceral and outer parietal layers. This fluid acts as a lubricant, allowing the tendon to slide smoothly during muscle contraction and joint movement, which directly prevents friction.

Evaluate the given options

• Prevent overextension: This is primarily a function of ligaments and joint capsules, not tendon sheaths.
• Provide insulation: Tendon sheaths do not serve a thermal or electrical insulating purpose.
• Prevent friction: The lubricating synovial fluid inside the sheath minimizes friction as the tendon glides.
• Provide strength to the attachment: The structural strength of the attachment is determined by the dense regular connective tissue of the tendon itself, not the surrounding sheath.

Answer:

• Prevent overextension
• Provide insulation
• Prevent friction (Correct answer)
• Provide strength to the attachment