The Water Cycle: The U.S. Geological Survey explains what the water cycle is and where water comes from. Animated Water Cycle: This animated water cycle diagram allows kids to click on different parts of the cycle to see how water changes form and moves.
The neuromuscular junction (NMJ) is the site of communication between motor nerve axons and muscle fibres. It is composed of four specialised cell types: motor neurons, Schwann cells, muscle fibres and the recently discovered kranocytes.
(e) Approximately 3â4 weeks after birth, the NMJ is matured and fully functional and all but one nerve terminal are withdrawn in a process known as synapse elimination. Terminal Schwann cell processes separately cap the nerve terminal while preterminal Schwann cells form myelin.