Diaphragm develops from four structures during weeks 4-12 of human development. Transverse septum forms first precursor, arising from cervical somites. Pleuroperitoneal membranes develop laterally, meeting transverse septum and dorsal mesentery. Muscle bundles from 7th to 12th segments form final dome-shaped diaphragm
Aperture is the opening through which light passes into the camera. Aperture blades move synchronously to adjust the size up to the lens's maximum. Aperture affects exposure and depth of field in images
Ligament under diaphragm that arches across quadratus lumborum muscle. Traversed by subcostal nerve, artery and vein. Runs from L1 transverse process to lower margin of L12 rib
F-number measures light-gathering ability of optical systems. Calculated by dividing focal length by entrance pupil diameter. Lower f-numbers indicate larger apertures and more light
Pressure gauges measure gauge, absolute and differential pressure. Range from 0.5 mbar to 6,000 bar with up to 0.1% accuracy. Available in Bourdon tube, diaphragm and capsule element technologies
Diaphragm is a double-domed muscle located at the inferior aspect of the ribcage. It divides the thoracic and abdominal cavities. Attaches to vertebrae, ribs 7-10, and sternum's xiphoid process. Forms central tendon that ascends to fuse with pericardium