Sternum and ribs Flashcards
What is the sternum commonly known as?
Breastbone
What type of bone is the sternum?
Flat bone
What part of the thorax is the sternum located in?
Middle of anterior thorax
What are the parts of the sternum?
Manubrium of sternum
Body of sternum
Xiphoid process
What is located between the different parts of the sternum in a child?
Cartilage
What happens to the cartilage located between the different parts of the sternum in an adult?
It ossifies to bone
What is the most superior part of the sternum?
Manubrium of sternum
What shape is the manubrium of the sternum?
Trapezoid shape
What is the shape of the superior border of the manubrium?
Concave depression
What is the name of the concave depression in the superior border of the manubrium?
Jugular notch
What is the shape of the superior border of the manubrium located laterally to the jugular notch?
Concave depressions
What do the concave depressions located laterally to the jugular notch do?
Articulate with sternal facet of clavicle
What is located on the lateral border of the manubrium?
Superiorly a facet
Inferiorly a demi facet
What does the facet on the lateral border of the manubrium do?
Articulates with 1st costal cartilage
What does the demifacet on the lateral border of the manubrium do?
Articulates with part of 2nd costal cartilage
What is the inferior border of the manubrium do?
Articulates with superior border of body of sternum
What is the name of the articulation between the manubrium and body of sternum?
Sternal angle
What is located laterally to the sternal angle?
2nd costal cartilage
What is the largest part of the sternum?
Body
What is located on the lateral border of the body of the sternum?
Facets
Demifacets, superiorly and inferiorly
What do the facets on the lateral border of the body of the sternum do?
Facets articulate with costal cartilages of ribs 3-6
What do the demifacets on the lateral border of the sternum do?
Demifacets articulate with part of costal cartilages of ribs 2 and 7
What shape is the body of the sternum?
Rectangular
What does the inferior border of the body of the sternum do?
Articulates with xiphoid process of sternum
What is the smallest part of the sternum?
Xiphoid process
What is the most inferior part of the sternum?
Xiphoid process
What spinal level is the xiphoid process located at?
T10 vertebrae
What part of the bony thorax are the ribs located in?
Lateral walls
How many ribs are there?
12
What does a typical rib consist of?
Head
Neck
Body
What is located on the head of the rib?
Superior articular facet
Inferior articular facet
What does the superior articular facet on the head of the rib articulate with?
Articulates with inferior demifacet of above vertebra
What does the inferior articulate facet on the head of the rib articulate with?
Articulates with superior demi-facet of vertebra below
What is the name of the joint between the articular facets on the head of the rib and the demifacets on the vertebrae?
Costovertebral joint
What does the neck of the rib do?
Connects the head to the rest of the body
What is located between the junction of the head and neck of the rib?
Tubercle
with facet
What does the facet on the tubercle of the rib do?
Articulates with transverse process of corresponding vertebrae
What is the name of the joint between the facet on the tubercle of the rib and the transverse process of the vertebra?
Costotransverse joint
What is the body of the rib?
The flat but curved part of the rib
What is located on the inferior surface of the rib?
Costal groove
What is located in costal groove?
Neurovascular bundle
What does the neurovascular bundle in the costal groove contain?
Intercostal artery, vein and nerve
What do the costal cartilages of ribs 1-7 articulate with?
Sternum
What do the costal cartilages of ribs 8-10 articulate with?
Join to costal cartilage of rib 7
What do the costal cartilage of ribs 11-12 articulate with?
Nothing
What are ribs 1-7 called? Why?
True ribs
Because their costal cartilage articulates with the sternum directly
What are ribs 8-10 called? Why?
False ribs
Because their costal cartilage articulates with the costal cartilage of rib 7 and then the sternum indirectly
What are ribs 11-12 called? Why?
Floating ribs
Because their costal cartilage doesn’t articulate with anything
How many openings of the thorax are there?
Two
What are the openings of the thorax? How are they named?
Superior thoracic aperture
Inferior thoracic aperture
based on their positions
What is the superior thoracic aperture adjacent to?
Neck
What is the inferior thoracic aperture adjacent to?
Abdomen