1. A muscle's contractile units lie within individual muscle cells, which are also called muscle fibers. Each muscle fiber contains numerous bundles of protein filaments. These bundles, called myofibrils, are organized into repeating contractile units called sarcomeres. 2. A sarcomere contains two types of protein filaments: actin filaments and myosin filaments. Each actin filament is attached to a Z line, which is found at either end of a sarcomere. The thick myosin filaments lie between the Z

Cremaster muscle is a paired structure made of thin layers of striated and smooth muscles. In Greek, the word means suspender. The main function of cremaster muscle is to pull the testes upward towards inguinal ring. The cremasteric reflex is brought on by such things as cold, touch, and anxiety. The cremasteric reflexive can be stimulated by rubbing a nerve on the inner thigh and buy emotions such as fear and laughter. Cremaster muscle comes from your obliques. Therefore, if you’re overworking

2.2K views · 27 reactions | The Babinski reflex (or sign), which is...