Ribs

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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


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