Ribs [6]

what rib/s move only slightly

first rib

this rib/s raises and lowers sternum

first rib

this rib/s’ slight movement increases anteroposterior diameter of the chest just slightly

first rib

this rib/s is not used during quiet breathing; only on active conditions [increased ventilation/deep breathing]

first rib

these ribs move simultaneously

ribs 2-7

what rib motion: rotation of axis of its own neck; sternal end rises and falls

pump handle

what rib motion: increases anteroposterior thoracic diameter

pump handle

what rib motion: rib move about its long axis from angle at sternum, causing middle part of rib to move up and down

bucket-handle

what rib motion: slightly reduces anteroposterior diameter

bucket handle

these ribs’ elevation of anterior ends produce small backward movement of lower sternum

ribs 8-10

these ribs slightly reduce thoracic anteroposterior diameter

ribs 8-10

outward rotation of the middle section of these ribs increases transverse diameter of thorax

ribs 8-10

these ribs participate in changing contour of chest in a minor way as they are pulled upward and outward

ribs 11 and 12

ribs responsible for caliper motion

ribs 11 and 12

what rib motion: changing contour of chest in a minor way as ribs are pulled upward and outward

caliper motion