Lecture on Variable Muscles in the Human Body

Introduction

• Variable muscles: Some muscles present in some people but not in others.
• Specific focus on the Palmaris Longus in the forearm.
• Variable muscles may be evolving out of humans.

Importance of Palmaris Longus

• Not necessary for day-to-day functioning.
• Weakly helps flex the wrist.
• Assists with gripping motions by creating tension in the palm.

Muscle Anatomy

• Upper Arm (Brachium): 4 muscles.
• Forearm (Antebrachium): 20 muscles.
• Hand: 11 muscles for fine motor skills like abduction, adduction, waving, etc.

Demonstration and Test

• Test to see if you have the Palmaris Longus:
  1. Slightly flex your wrist.
  2. Pinch your pinky and thumb together.
  3. Observe the tendons in your wrist.
• Additional tendon seen is Flexor Carpi Radialis.
• The presence of Palmaris Longus varies between individuals and even between different arms of the same individual.

Clinical Significance

• Tendon can be used for grafts in surgical repairs like the Ulnar Collateral Ligament in pitchers.

Evolutionary Context

• Evolution activates certain genes based on environmental factors.
• Unnecessary muscles may become less common over generations.

Conclusion

• Having or not having the Palmaris Longus has minimal impact on functionality.
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