Ribs and Thoracic Vertebrae Flashcards
What structures make up the thoracic skeleton?
clavicle / scapula Sternum (rib cage) Manubriosternal joint Ribs Costal cartilages Thoracic Vertebrae Diaphragm
Describe the different ribs structures
True ribs (1-7) False ribs (8-10) Floating ribs (11, 12)
What structures form the sternum?
Manubrium
Body
(Xiphisternum) xiphoid process
What is the location of the false ribs (8-10)?
False ribs (8-10) start at the thoracic spine and cartilage connects them to the sternum
What is the function of the floating ribs (11,12)?
protect kidneys and come round the back
What is the role of the manubrium?
Manubrium connects top part of thorax and is attached to sternum body via a cartilaginous joint - allows movement
What is the role of the xiphoid process?
Xiphoid is area of attachment for the abdominal muscle
projects downwards into intersternal angle
What is the role of the costal cartillages
Form springy links between ribs and sternum
Outline where each rib articulates along the sternum
1st rib articulates with manubrium
2 articulates with cartilaginous joint between manubrium + sternum
3 - 6/7 articulate with sternal body
Which ribs form the costal arch?
7-10th ribs join in series to one another
form the intersternal angle between the 2 costal arches
Describe the structure of a typical rib
Thin, flat and spiralled
At the back Head and tubercle with articular facets, separated by the neck
What interrupts the curvature of the rib?
The angle of rib marks the insertion of the iliocostalis muscle
What structures run in the groove of the ribs?
Inner aspect of underside marked by the groove in which intercostal vessels and nerves run
Describe the head of the ribs
Has 2 facets which articulate with the 2 vertebral bodies above and below forming the costo-vertebral joint
Explain the tubercle facets and their role
Tubercle facet articulates with tip of transverse process to form costotransverse joint
