Anatomy Of Bony Thorax, Sternum And SC Joints Flashcards
The bony thorax
- provides an expandable chamber for respiration
- protects the lungs, heart and great vessels
- consists of sternum, thoracic spine, and 12 ribs
The sternum is a “flat bone” with what three divisions?
Manubrium, body, xiphoid
The body of the sternum is made up of ____ segments which are completely fused by age 25
Four
True/false: The xiphoid is not totally ossified until age 40
True
True/ false: the sternum is a highly cancellous tissue covered by thin layer of compact bone (common site for a bone marrow biopsy)
True
The first 7 pairs of ribs are called
True ribs
Each _____ attaches directly to the sternum through its own costocartilage
True rib
Ribs 8-12 are called
False ribs
Ribs 8 thru 10 connect to the costocartilage of rib __
7
Ribs 11 and 12 are ______ ribs because they have no anterior articulation
Floating
The first rib is most ____ (horizontal/vertical)
Vertical
Moving in an inferior direction, ribs 1 thru 7 (increase/decrease) in length
Increase
Moving in an inferior direction ribs 7-12 get (longer/shorter)
Shorter
The bony thorax is widest around ribs what
8-9
True/false: ribs 8 thru 12 are too short to reach the anterior side of the body
True
The head of a rib articulates with one or two ______ bodies (depending on the vertebral body facets)
Thoracic vertebral bodies
The tubercle articulates with the ______ process of a thoracic vertebra, and is the site of a ligament attachment
Transverse process
The shaft (body) angles ____ and ____ at the “angle of the rib”
Anteriorly, and inferiorly
The vertebral end of each rib, sits more (anteriorly/superiorly) than the sternal end
Superiorly
Why are rib injuries so painful?
Because each costal groove contains an artery, a vein and a nerve
Costochondral junction
An immovable joint bound by the periosteum of the rib
Sternoclavicular joints
Synovial joints with a gliding motion (like carpal bones)
Sternocostal joint of rib one
Immovable joint
Interchondral joints ribs 6 thru 9
Gliding synovial joints
Costrotransverse joints and costovertebral joints
Gliding synovial joints
True/ false: ribs 11 and 12 have no costotransverse joints
True
Ribs furthest away from IR that you will see for a __ oblique (turn ribs away from IR to get spine out of the way)
PA
LPO for an AP oblique rotate pt 45 degrees move ribs ____ to detector
Closer
Upper ribs include ribs
1-10
Lower ribs include ribs
8-12
