Ribs
Floating ribs definition
Cartilages do not attach to sternum
There are ____ intercostal spaces and thus _____
-11 -11 intercostal nerves
The space below the ___ is known as ____
-12th rib -subcostal space (contains subcostal nerve)
How are ribs 11-12 atypical?
-Has no neck or tubercle -Only has one facet that articulates with corresponding vertebrae
How is rib 1 atypical?
-Has one facet on its head (that articulates with corresponding vertebrae) -Shorter and wider than other ribs -Has two grooves on its superior surface that make way for subclavian vessels -has a scalene tubeercle
_____ costal margin is formed by ____
-cartilaginous -Ribs 8-10
False ribs have an ______ attachment to the _____
-indirect -sternum
How is rib 2 atypical?
-longer and thinner than rib 1 -Roughened area on its upper surface where serratous anterior originates -has two articular facets on its head
Subcostal nerve is a _____ that comes from ____
-spinal nerve -anterior ramus of T12
What makes a rib typical
-wedge-shaped head -two articular facets --> one that articulates with vertebrae above and one that articulates with the vertebrae of the same number
Atypical ribs include
1, 2, 10, 11, 12
Floating ribs are ____
11-12 (sometimes 10)
Typical ribs are ribs ____
3-9
How is rib 10 atypical?
Only has one facet that articulates with corresponding vertebrae
True ribs are _____
Ribs 1-7
False ribs are ____
Ribs 8-10
False ribs definition
The cartilages of these ribs are connected to the ribs above them
Floating ribs terminate ____
in the posterior abdominal musculature
True ribs definition
ribs have their own costal cartilages that attach to the sternum
Intercostal spaces function:
separate ribs and costal cartilages from each other