Anatomy Of Thoracic Wall Flashcards
How many ribs are there?
12
What is included in the thoracic wall?
Thoracic cage
Muscles between ribs
Skin
Muscles which cover anterolateral wall
Which ribs are true ribs? What does this mean?
Ribs 1-7
Connected by costal cartilages to the sternum
Which ribs are false ribs? What does this mean?
Ribs 8-10
Connected to the cartilage of the rib above them
Which ribs are floating ribs? What does this mean?
Ribs 11 and 12
They end free in abdominal muscle
Which ribs are typical ribs?
3-9
Structure of typical ribs?
Head has two articular facets separated by a crest
The neck connects the head of the rib with the body
The tubercle is the at the junction of the neck and body.
The body/shaft has a concave surface with a costal groove
Function of the articular facets on the head of a true rib?
One facet articulates with the vertebra
The other articulates with the vertebra superior
What is the function of the tubercle on a typical rib?
Articulates with the transverse process of the vertebra
Attachment for costotransverse ligament
What is the function of the intercostal groove
Provides protection for the intercostal nerve and vessels
Which ribs are atypical?
1, 2, 10, 11, 12
What makes the first rib atypical?
Very short and board and curved
Has one facet
What makes the second rib atypical?
Poorly marked costal groove
Tuberosity for serratus anterior
What makes ribs 10, 11 and 12 atypical?
One facet on the head and articulate with a single vertebra
11 and 12 have no tubercle or neck because they are floating
What articulates at the costotransverse joint?
Tubercle of rib and transverse costal facet of corresponding vertebra
What articulates at the costovertebral joint?
Where head of rib articulates with superior costal facet of the corresponding vertebra and inferior costal facet of the vertebra above
So two for each rib
Name the three parts of the sternum
Manubrium
Body
Xiphoid process
Features of the manubrium?
Concave
Depression - jugular notch
Fossa lined with cartilage which articulate with clavicle
Facet for articulation with costal cartilage of first rib
Demifacet for second rib