| rib |
|
the bone forming the lateral thoracic wall |
12 pairs; several types are described: typical or "true" ribs, "false" ribs,
"floating" ribs; all three types of ribs have many features in common: head,
neck, tubercle, angle, body, costal groove |
|
head |
posteromedial end of the rib |
it articulates with demifacets of two adjacent vertebral bodies |
|
neck |
the constricted region lateral to the head of the rib |
the neck of the rib is located between the head and the tubercle |
|
tubercle |
a projection located posteroinferior and lateral to the neck of the rib |
it articulates with the transverse process of a vertebra |
|
body |
the shaft of the rib |
the body is the longest part of a typical rib |
|
angle |
the marked angulation of the body located just lateral to the tubercle |
the angle of the rib is its most posterior part |
|
costal groove |
the groove on the inner surface of the inferior border of the body of the
rib |
it accommodates the intercostal neurovascular bundle; the costal groove
provides a protective function for the intercostal neurovascular bundle, |
| ribs 1-7 |
|
"true" ribs - those which attach directly to the sternum |
true ribs actually attach to the sternum by means of a costal cartilage
and a true synovial joint |
| rib 1 |
|
the most cephalic rib |
it is the broadest, shortest and widest of the ribs; the scalene tubercle
marks its superior surface and is an elevation between grooves for the subclavian
vein & artery; the scalene tubercle is the attachment site of the scalenus
anterior m. |
| rib 2 |
|
the rib attached to the 1st and 2nd thoracic vertebrae |
it articulates via a costal cartilage with the sternum at the level of the
sternal angle; its superior surface is roughened by the attachments of the
scalene mm. |
| rib 8-10 |
|
"false" ribs |
they articulate via costal cartilages with the costal cartilage of rib 7 |
| rib 11-12 |
|
"floating" ribs |
the anterior ends of these ribs do not articulate with the sternum or the
costal cartilage of the rib above; their costal cartilages are short and end
in the muscle of the posterolateral abdominal wall |
| sternum |
|
the broad flat bone forming the anterior thoracic wall |
it is formed by three parts: manubrium, body, xiphoid process |
|
manubrium |
the superior part of the sternum |
manubrium means "handle", as in the handle of a sword |
|
jugular (suprasternal) notch |
a notch on the superior border of the manubrium |
it is located between the clavicular notches which articulate with the sternal
ends of the clavicles |
|
clavicular notch |
a notch on the superolateral border of the manubrium |
it articulate with the sternal end of the clavicle |
|
sternal angle |
the junction of the manubrium and body of the sternum |
it is an anterior projection located at the level of the costal cartilage
of rib 2; an important landmark for internal thoracic anatomy |
|
body |
the middle part of the sternum |
it articulates with the manubrium superiorly and the xiphoid process inferiorly;
laterally it articulates with the costal cartilages of ribs 2-7 |
|
xiphoid process |
the inferior part of the sternum |
xiphoid means "sword shaped"; it is variable in size, shape & ossification;
it articulates with the body of the sternum superiorly |
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