Trigger Thumb

In this chapter, we focus on the traumatic injuries of tendons and ligaments in childhood. Other pathologies affecting these structures that are specific to children are addressed elsewhere in the book, including snapping hip (see Chapter 12), trigger thumb (see Chapter 11) and tenosynovitis (see Chapter 3). 

The thumb-web area, referred to in the above procedure is the V-shaped section formed by the surfaces on the back of thumb, the trigger finger and the area between the thumb and trigger finger. Controlled firing tests show that the bulk of the gunshot residues are deposited on this area of the back of the hand... 

Cock the weapon by pulling back the striker knob until the trigger lever engages the sear notch on the striker. It is now ready to fire. The weapon may be concealed up the sleeve and fired by squeezing the lever with your thumb. 

The double action pistol enables the firer firstly to cock the hammer and rotate the cylinder and then to release the hammer - all as a result of one long trigger pull. In most designs the weapon can also be thumb-cocked like a single action revolver. The first double action revolver of significance was produced by Beaumont in London in 1855. This could function as either a double action or single action revolver, and the idea was used in the Adams revolver which became the official Brit service revolver. Colt then gave up his Brit factory in 1857 and returned to the USA. His six-chambered percussion 1860 model in. 44 cal was extensively used in the American Civil War and more than 200,000 were made... 

Since individuals within the colony are almost constantly encountering their nestmates, it would not be adaptive to continuously have to compare their profiles with an internal template in the long-term memory. The alternative would be to filter out all this input early in the neural structures and only react to hydrocarbon profiles that are dissimilar to the nestmate ones. With either desensitized antennae or habituated antennal lobes, individuals in the social insect colony would not detect or respond to the hydrocarbon profiles of nestmates (D-present), nor would they actively detect that non-nestmate hydrocarbon patterns are absent (U-absent) when accepting an encountered individual, as proposed by Sherman et al. (1997). Instead, they would only detect cues present on non-nestmates, since only these trigger the antennae or the antennal lobe to respond, and on this basis reject the encountered individual. Social insects would thus use the following as a simple rule of thumb if the receptor neurons are not spiking and/or the pattern of activation in the antennal lobes is not altered (no differences in nestmate recognition cues are detected), the encountered individual is accepted as a nestmate. This results in the same acceptance and rejection outcome... 

To fire, the trigger is pulled back with the left hand and held back with the thumb of the right hand. The gun is then aimed and the thumb releases the trigger and the thing actu ally fires. 

Although there is no officially-sanctioned definition of what constitutes demolition for the purposes of CDM, and the triggering of the need for method statements, an unofficial rule of thumb which can be followed with some confidence is that demolition proper involves the taking down of load-bearing structures and/or the production of a substantial quantity of demolished material - about 5 tonnes as a minimum. This rule attempts a practical definition based on the level of risk attached to the work. A stricter interpretation would mean that the removal of any part of a structure could be classed as demolition work, and a result of its being followed would mean there would be very few projects which did not fall within the scope of CDM clearly not what was intended. 

Compression of the web space between the index finger (from above) and the thumb (from below) can also trigger pain (Tinel sign). 

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