The Thorax Flashcards
Label the surface anatomy:
What makes up the thorax?
(3)
Sternum
12 pairs of ribs (24 individual ribs)
Costal cartilages
Label the thorax:
What does the clavicular notch connect to?
The clavicle
What happens at the sternal angle?
It’s where the manubrium connects to the body
Anteriorally, where do the ribs connect to?
The sternum, via costal cartilages
Posteriorally, where do the ribs connect to?
The vertebrae
What is the manubrium?
The head of the sternum
What are the features of the manubrium?
(4)
It’s the wider superior portion
It articulates with the clavicles and the first 2 pairs of ribs. The 2nd rib attaches to the sternal angle
The jugular notch can be easily felt at the anterior base of the neck, between the medial ends of the clavicles
The clavicular notch is the site of the sternoclavicular joint, between the sternum and clavicle
Label the sternum:
What are the features of the body of the sternum?
(2)
It’s the middle portion of
It gives attachment to the ribs 3-7 pairs
What are the features of the Xiphoid process of the sternum?
(2)
It’s the inferior tip
It gives attachment to the diaphragm and abdominal muscles
What’s really important to know about the placement of the ribs?
Since the 1st rib is hidden behind the clavicle, it’s hard to identify it. So the 1st rib we can actually see is the 2nd rib-not the 1st
Which type of imaging analyses the sternoclavicular joint the best?
CT scans
What are the features of the sternoclavicular joint?
(3)
It’s between the medial end of the clavicle and the manubrium of the sternum (clavicular notch)
It’s a saddle-type synovial joint
It allows the elevation, depression, protraction and retraction of the shoulders
How many pairs of ribs do we have?
12 pairs
What are the features of the ribs?
(5)
There’s 12 pairs of ribs
Pairs 1-7 directly attach to the sternum at their own costal cartilage- true ribs
Pairs 8-10 indirectly attach to the sternum at the costal cartilage- false ribs. They connect to 1 costal cartilage that then connects to the lowest bit of the body of the sternum
Pairs 11 and 12 aren’t attached to the sternum- floating ribs
Intercostal spaces
Which pairs of ribs are known as the true ribs?
Pairs 1-7
Which pairs of ribs are known as the false ribs?
Pairs 8-10
Which pairs of ribs are known as the floating ribs?
Pairs 11 and 12
How are the intercostal ribs named?
They’re named according to the rib that’s above
E.g.
rib 1
Rib 2
Intercostal space 2
Rib 3
Rib 4
Intercostal space 4
Rib 5
Label the ribs:
What are the 2 types of ribs?
Typical ribs
Atypical ribs
What are the features of the typical ribs?
(4)
Flat bones
The anterior end is connected to the sternum by the costal cartilage to form the sternocostal joints
The head of the clavicle is posterior and connects to the Demi-facets of the spine/vertebrae to form the costovertebral joints
The articular part of the tubercle with the transverse process of the vertebra to form the costotransverse joints
