If You Had All of Your Fingers (Including the Thumb)

question 86

Multiple Choice

If you had all of your fingers (including the thumb) spread out wide, which muscle or group would bring your thumb toward your first finger?

• A) Adductor pollicis
• B) Palmar interossei
• C) Dorsal interossei
• D) Lumbricals
• E) Abductor pollicis longus

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Definitions:

Serous Membrane

A serous membrane is a thin layer of tissue that lines certain internal cavities of the body, secreting a serous fluid that lubricates and reduces friction between organs.

Serous Fluid

A clear, thin fluid that lubricates the surfaces between two membranes, reducing friction from muscle movement.

Reduce Friction

A method or process of decreasing resistance between two objects or surfaces in contact, often to improve efficiency or prevent wear.

Perpendicular Orientation

A position or alignment where two lines or planes meet at a right angle or 90 degrees to each other.