Received 5 March 2011, Accepted 24 March 2011, Available online 23 June 2011. Spontaneous pneumomediastinum is defined as free air within the mediastinum, not associated with trauma. Causes include exercise, drugs, asthma, vomiting, difficult labour and Valsalva maneuvers. Itâs a rare, usually benign and self-limited condition, more prevalent in young males.
A youth bouncing on a trampoline. A trampoline is a device consisting of a piece of taut, strong fabric stretched over a steel frame using many coiled springs. People bounce on trampolines for recreational and competitive purposes.
The pelvic floor muscles are like a round âtrampolineâ of muscle at the bottom of the pelvis that lies between these four bones. The trampoline sags and moves down when it relaxes â and tightens and moves up as it contracts. On top of the muscular trampoline lie the bladder and the rectum (bottom part of the bowel). The pelvic floor muscles tighten to stop the flow of urine from the bladder and to control wind from the back passage. They relax to pass urine or a bowel motion.