Extract a single list of data points from a list of multiple lines

So I have a list of 50 lines that ive acquired using the EdgeDetect function on a .bmb from an experiment ive run. The list looks like:

lines = {{{{938.0182717999902`, 
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{{877.1095748869737`, 781.2787325860536`}, {873.750799922499`, 
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What I would like to be able to do is take each of the 50 lines in this list. extract their beginning and end points and place that into a single list which should have 100 points which will hopefully make it easier for me to do some of the image analysis im looking to do.

Is it possible to do this via an inbuilt method that im not finding in the documentation or is there something I need to write for this.

In response to those asking for a smaller data set I reran my edge detect with much fewer features. Heres a list of 5 relevant lines for expirimentation

lines2={{{{938.018, 641.694}, {934.882, 649.594}}, {{931.007, 
659.353}, {899.825, 737.889}}, {{892.075, 757.407}, {887.462, 
769.024}}, {{884.141, 777.389}, {881.558, 783.895}}, {{944.107, 
626.358}, {943., 629.147}}}, {{{510.346, 794.025}, {506.987, 
787.319}}, {{501.165, 775.696}, {468.921, 711.319}}, {{459.965, 
693.437}, {453.023, 679.578}}}, {{{936., 663.703}, {930.85, 
673.985}}, {{926.148, 683.373}, {917.863, 699.914}}, {{908.01, 
719.585}, {881.812, 771.891}}, {{877.11, 781.279}, {873.751, 
787.985}}, {{870.168, 795.138}, {868.825, 797.82}}}, {{{534.14, 
420.13}, {546.616, 414.971}}, {{563.25, 408.093}, {638.565, 
376.951}}, {{655.199, 370.073}, {668.137, 364.724}}}, {{{498.295, 
777.833}, {493.064, 765.387}}, {{486.09, 748.793}, {453.93, 
672.277}}, {{446.955, 655.683}, {442.887, 646.004}}}};

An example of part of what im looking for is what happens if i extract a single element of this list of lines:

ListPlot[lines[[1]]]

i get a nice line of data points but if i use:

ListPlot[{lines[[1]],lines[[2]]}]

i get nothing. additionally, to do what im looking for i would need to plot all 50 of these one one plot and then strip out the excess data points that arent the endpoints for each line

Points = lines[[1]];
Do[Points = Join[Points, lines[[i]]], {i, 2, 50, 1}];