myoneural [mÄ«â²Å-nÅ«â²rÄl] Type:Term. Definitions 1. Relating to both muscle and nerve; denoting specifically the synapse of the motor neuron with striated muscle fibers: myoneural junction or motor endplate. Stedmanâs Medical Dictionary Â© Wolters Kluwer Health.
On 16-Aug-1960, Captain Joseph Kittinger of the US Air Force parachuted from a helium balloon at an altitude of 102,800 ft (19.5 miles / 31,354m) setting three world records; the highest parachute jump, the longest free fall (85,300 ft in 4 mins 36 seconds) and the first person to break the speed of sound without an aircraft (714 mph).
Sport sky divers can push the envelope to about 14,000 or 15,000 feet AGL at some sky-diving facilities for regular parachute jumps. Climb much above that altitude and you start needing additional oxygen to breathe comfortably in the thinner air.