The iPhone 6s and 6s Plus are made from a 7000 Series aluminum alloy, which is stronger and more durable than the 6000 series used in the previous-generation iPhones. Apple's also updated the devices with stronger glass, made using a dual ion exchange process.
Two important sacral nerves to the functioning of the bladder and bowel are the pudendal nerve and the pelvic splanchnic nerve. Through a series of reflexes and signals the nerves and the bladder and bowel coordinate with the pelvic floor muscles and external urinary and anal sphincters.
Internal urethral sphincter nerves. The nerves that control your urethral sphincter can be described as follows: Parasympathetic nerves from the S2, S3 and S4 levels of the spinal cord control the internal sphincter, causing it to relax to allow urine to pass out of the bladder.