How many ribs are there? How many true ribs? Flase ribs? Floating ribs?
What are the typical parts of a ribs?
Ribs-12 True-7 False-3 Floating-2
Head with 2 facets, Neck, tubercle, Body or shaft, Angle, Costal Groove
What are the three joints of the rib?
Where is the point of articulation for the costoverterbral joint?
The head of the rib with the superior part of the corresponding verterbrea, the inferior part of the inferior vertebrae and the vertebral disc. It is a synovial plane joint. The radiate ligament, thickened anteriorly, surrounds the head of the rib and the two bodies of the vertebrea. Inter-articular ligament attaches the head of the rib to the intervertebral disc.
Where is the articulation of the costotransverse joint?
Between the tubercle of the rib and the associated transverse process.
Synovial plane joint.
Supported by superior and lateral costotransverse ligaments.
Where is the articulation of the costochondral joint?
Sternal end of rib with the costal cartilage
Primary cartilagenous joint
No ribs attach directly to the sternum.
Where is the articulation of the sternocostal joint?
costal cartilage with the manubriumand sternum
1 rib is primary cartilagenous joint
2-7 are synovial plane joints (supported by the anterior and posterior radiate sternocostal ligaments)
How does inspiration increas the volume of the thoracis cage?
1-Vetical Contraction of the diaphragm
2-Transverse Bucket handle, raising of ribs 8-10
3-Ant/Post pump handle movement of ribs 1-7
What are the main muscles of the thorax region? 9 total
Pectoralis major and minor
11 pairs of muscles
Run oblique from rib above to rib below
Run anterior inferior direction
As they reah the COSTAL CARTILAGES, they become the external intercostal membrane
11 pairs, Deep to the external intercostals, oblique at right angles to the external intercostals,posteriorly the form the interncostal membrane.
11 pairs running similar to the internal intercostals
Seperated by internal intercostals by the intercostal nerves and vessels
cover the middle 3/4 of the intercostal space
Thin muscular slips that extend from the angle of the rib on the internal surface, to the internal surface of the rib below.
Cross two intercostal spaces
Run in same direction as the internal intercostals
Four or Five muscle slips that arise from the zxiphoid and body of sternum, span superiorly and laterally to the 2nd and 6th costal cartilages.
12 fan shaped muscles
arices from transverse processo f C7 to T11
Inferiorly and laterally insert on the ribs below.
Where do the intercostal nerves come from?
The ventral primary rami of the first 11 thoracic spinal nerves
The 12th is called the subcostal nerve.
How do the intercostal spaces receive their blood supply?
A large posterior intercostal artery arising from the aorta and a small intercostal artery arising from the internal thoracic artery which arises from the subclavian artery