There are three principal layers; 1  External intercostal muscles aid in quiet and forced inhalation. They originate on ribs 1-11 and have their insertion on ribs 2-12. 2  Internal intercostal muscles aid in forced expiration (quiet expiration is a passive process).
Costs. A professional concrete contractor will typically charge $2-$4 per square foot for a simple stain application, including the sealer. A stain application with patterning and sawed lines will typically cost between $4 and $10 per square foot.
The cost of stained concrete is going to be determined by the amount of square footage and the type of stain being used. If stencils are going to be used in order to give the concrete a design, the price may be slightly higher.However, the end results are going to pay off.tained Concrete Patio Cost Guide. The area being stained is going to determine the cost per square foot. For example, if the homeowner is just wanting to do a minimal slab preparation and no decorative stains, the price will be lower. Also, any larger projects are going to help lower the cost per square foot.