I have noticed that my ribs are showing now my body fat is dropping. After closer inspection, I have found that they are infact muscles called ‘Intercostal Muscles’. They are just below the pecs.

http://en.wikipedia.org/wiki/Intercostal_muscle

The ones visible on the pictures are a mixture between my ribs and the Serratus anterior muscles.

http://en.wikipedia.org/wiki/Serratus_anterior_muscle

Just thought I’d blog it to remind myself better.