Transversus Thoracis and a Typical Thoracic Vertebra
A great wee muscle that plasters the internal thoracic vessels to the anterior thoracic wall. Here's a new diagram showing it's location (originating on the internal/deep/posterior aspect of the sternal body). More notes on it here.
And introducing a brand new set of notes and diagram of a typical thoracic vertebra. More on notes on this here.