7.29 The Ribs
What is a tubercle?
A small elevation that projects dorsally
What are the five main structural areas on a rib?
- Head - Neck - Tubercle - Angle - Body
What are the two surface features found on the head of the rib?
- Superior articular facet - Inferior articular facet
How many ribs are there in the thoracic cage?
12 pair
What is a surface feature found on the tubercle?
Articular facet
What is another name for the head?
Capitulum
Is the inner surface of the rib considered concave or convex?
Concave
Is the superficial surface of the ribs considered concave or convex?
Convex
What is another name for the ribs?
Costae
What are the true ribs connected to the sternum by?
Costal cartilages
What are ribs 8 - 12 called?
False ribs
What is another name for ribs 11 and 12?
Floating ribs
What is the function of the costal groove?
It provides a path for nerves and blood vessels
Which two ribs do not have a tubercle?
Ribs 11 and 12
What is the function of the superficial surface of the rib?
Serves as an attachment site for muscles of the pectoral girdle and trunk
How do the vertebrochondral ribs indirectly attach to the sternum?
The costal cartilages fuse together and merge with the cartilages of rib pair 7 before they reach the sternum
What do the superior and inferior articular facets articulate with?
The costal facets on thoracic vetebrae
What surface feature is found on the inner surface of the rib?
The costal groove
What structure is found between the head and tubercle of the rib?
The neck
What is the angle?
The site where the rib begins curving toward the sternum
What does the articular facet on the tubercle articulate with?
The transverse costal facet on the transverse process of a thoracic vertebra
What is the major difference between the true ribs and the false ribs?
The true ribs are attached directly to the sternum and the false ribs are not
What are the first seven ribs called?
True ribs
What is another name for the floating ribs?
Vertebral ribs
What is another name for ribs 8 - 10?
Vertebrochondral ribs
What is another name for the true ribs?
Vertebrosternal ribs