The first to sixth ribs are the ones primarily involved in this movement. During inspiration, the transverse diameter of the thorax is increased by the ribs swinging outward; bucket-handle rib motion. The seventh to tenth ribs are the ones primarily involved in this movement.Click to see full answer. Regarding this, which ribs show bucket handle type of movement?The outward and upward movement of ribs to increase the transverse diameter of the thorax is termed as bucket handle movement. Upper ribs show more pump handle activity as they have a transverse axis of motion between costovertebral and costotransverse articulation which makes options A and B incorrect.Likewise, what do true ribs do? Medical Definition of True rib A rib is said to be “true” if it attaches to the sternum (the breast bone). All 12 pairs of ribs attach to the building blocks of the spine (vertebrae) in the back. False ribs: The lower five ribs do not directly connect to the sternum and are known as false ribs. In this regard, which ribs do pump handle motion? Movement at costovertebral joints 2 to 6 about a side-to-side axis results in raising and lowering the sternal end of the rib, the “pump-handle” movement. This occurs mostly in the vertebrosternal ribs. In elevation, this increases the anteroposterior diameter of the thorax.Where are the floating ribs located?These ribs are referred to as “floating ribs” as their only attachment is found at the back of the rib cage, anchored to the vertebrae of the spine.