The Mystery Muscle: Palmaris Longus and Evolution in Human Anatomy

The video tutorial explores the variability of certain muscles in the human body, focusing on the palmaris longus muscle in the forearm. It discusses the anatomy of the upper limb, the evolutionary reasons for muscle variability, and provides a simple test to check for the presence of the palmaris longus. The video also touches on the clinical use of this muscle's tendon for grafting.

What is the evolutionary significance of variable muscles like the palmaris longus?

• They are essential for daily functions.

• They are unique to each individual.

• They are evolving out of humans.

• They are necessary for survival.

How many muscles are there in the brachium?

• Four

• Twenty

• Eleven

• Thirty

What is the primary function of the palmaris longus muscle?

• Strongly flex the wrist

• Weakly flex the wrist

• Rotate the forearm

• Extend the fingers

Why do some people not miss the palmaris longus muscle?

• It is crucial for hand movements.

• Other muscles can perform similar functions.

• It is necessary for gripping.

• It is the only muscle in the forearm.

What is the significance of the palmaris longus muscle in evolution?

• It is unique to each individual.

• It is evolving out of humans.

• It is essential for survival.

• It is becoming more common in humans.

What is the test to check for the presence of the palmaris longus muscle?

• Flex the elbow and touch the shoulder.

• Flex the wrist and pinch the thumb and pinky together.

• Extend the fingers and rotate the wrist.

• Rotate the forearm and extend the wrist.

What can the palmaris longus tendon be used for in a clinical setting?

• To repair a damaged ligament

• To extend the fingers

• To rotate the forearm

• To strengthen the wrist