chest wall vs middle

chest wall

• The set of tissues that bound the thoracic cavity, including the rib cage, fascia, muscles etc. 

middle

• The central part of a human body; the waist. 

• A centre, midpoint. 

• The part between the beginning and the end. 

• The middle stump. 

• The middle voice. 

• Pertaining to the middle voice. 

• Located in the middle; in between. 

• Central.