As described in Chapter 6, the skeleton is divided into axial and appendicular portions (see Figures 6.1 and 7.1). The axial skeleton is structured from 80 bones segregated intothree major regions: the skull, vertebral column, and thoraciccage (Figure 7.1) . This part of the skeleton (1) forms the lon-gitudinal axis of the body, (2) supports the head, neck, and Chapter 7 The Skeleton 199 7 Figure 7.1 The human skeleton.
Above: Some cameras have a switch to set it to auto or manual focus. Manual focus, meanwhile, disables autofocus and enables you to adjust it yourself. This is useful when the focusing system can't find focus for whatever reason, such as when it's too dark or when there's little contrast in the scene.
Today's P&S cameras are much more sophisticated and often include a zoom lens, exposure modes, and many other features. While there are still some P&S film cameras, such as the disposable or one-time use cameras, most are now digital. While they can vary, most point and shoot cameras include standard features. 1  Metering systems to calculate the amount of light entering the camera. 2  Variable shutter speed. 3  Variable aperture.  Zoom 1  lenses. Automatic focus.  Preset controls for various photographic situations such as landscapes, night photography, people, and close-ups.