1/23/18 Thoracic Cage (Rib Cage)
Stenral Angle (Manubriosternal joint)
- Marks attachment of rib 2 - landmark for listening to heart valves - Location of transverse thoracic plane (t-4/ t-5) Disc -Marks aortic arch and trachea bifurcation
Ribs
-24 ribs (12 pairs) - all ribs attach posteriorly to the vertebrae
Sternal Angle is aka
Angle of Louis. The sternal angle is the angle formed between the manubrium of the sternum and the body of the sternum (manubriosternal junction), and is an important anatomical landmark. It marks the level of the 2nd pair of costal cartilages which lies at the level of the intervertebral disc between thoracic vertebrae 4 and 5.
False Ribs 8-10
Attach to sternum via costal cartilage of rib 7 - indirect to sternum
Posterior joints of thoracic cage
Costovertebral - synovial/diathrodial -gliding joints -between head of ribs and vertebral body Costotransverse -synovial/dirathrodial -gliding joints -between tubercle of ribs and transverse processes
True ribs 1-7
Direct attachment to sternum through individual costal cartilages
What is the purpose of costal groove
Holds and protects arteries, nerves
Anterior Joints of thoracic cage
Manubriosternal - Between manubrium and sternal body - marks sternal angle - symphysis/ amphiarthrodial Sternocostal - Between costal cartilages and sternum - rib 1- syncondrosis/ amphiarthrodial - ribs 2-7 synovial/ diarthrodial (gliding) Costochondral junctions - between rib bones and costal cartilages of ribs 1-7
Floating ribs (11 & 12)
No anterior attachment to sternum much shorter, and flatter
What is the function of the Thoracic Cage?
Protects thoracic and abdominal viscera, aids in respiration, surface area for muscle attachment, provides attachment for the upper limb, Clavicle attaches to sternum.
Manubrium (part of sternum)
Suprasternal (jugular notch) Articulations for Clavicle and 1st ribs attach directly to it
What parts is the rib cage made out of
T1-T12 Vertebrae, 12 Pairs of ribs, Sternum
What artery runs over rib 1
The subclavian apv