Ribs Flashcards
How are the ribs classified based on their anterior attachment?
True ribs (1-7): Attach directly to the sternum via their own costal cartilage.
False ribs (8-10): Attach indirectly to the sternum through the cartilage of the rib above.
Floating ribs (11-12): Do not attach to the sternum, end within the muscles of the posterior abdominal wall.
What type of cartilage is costal cartilage?
Hyaline cartilage.
What ribs are considered typical ribs, and what are their defining parts?
Ribs 3 to 9 are typical ribs. They consist of the head, tubercle, neck, angle, shaft, and intercostal groove.
What is the structure and function of the head of a typical rib?
The head has two articular facets for articulation with the body of the corresponding vertebra and the vertebra above.
What is the function of the tubercle of a typical rib?
The tubercle presents an articular facet for articulation with the transverse process of the corresponding vertebra.
Where is the neck of a typical rib located?
The neck is located between the head and the tubercle of the rib.
What is the angle of a typical rib?
The angle is the region where the shaft makes a sharp bend.
Describe the shaft of a typical rib.
The shaft is the thin, flat, curved part that attaches anteriorly to the costal cartilage.
What is the function of the intercostal groove on a typical rib?
The intercostal groove, located on the internal surface close to the inferior border of the rib, provides some protection to intercostal nerves and vessels.
What makes the first rib atypical?
The first rib is wide, short, and flat. It has only one articular facet on its head and features the scalene tubercle, where the anterior scalene muscle attaches. Two grooves mark where the subclavian vessels cross the rib.
What distinguishes the second rib from typical ribs?
The second rib is similar to typical ribs but has a rough tuberosity on its superior surface for the attachment of the anterior scalene muscle.
How is the 10th rib atypical?
The 10th rib has only one articular facet on its head for articulation with the body of its corresponding vertebra.
What makes the 11th and 12th ribs atypical?
The 11th and 12th ribs each have only one articular facet on the head, a short neck, and no tubercle.
