Chapter 10 Flashcards
Main function of the bony thorax
Expand and contract during respiration and to protect the organs of the respiratory system and those within the mediastinum
3 parts of the sternum
Manubrium
Body
Xiphoid process
What is the sternum composed of
Thin, narrow, flat, compact bone
The bone in the middle of the sternum is _____ and is often a site for _________ to be extracted
Spongy
Red bone marrow
How long is the manubrium
2 inches
How long is the body of the sternum
4 inches
How many segments are there of the sternum body? And when do they fuse together?
4 segments
Age 25
What is the xiphoid process composed of?
Cartilage until age 40 when it becomes totally ossified
What level is the jugular notch
T2-T3
What level is the sternal angle
T4-T5
What level is the xiphoid tip?
T9-T10
The only bony connection between each shoulder girdle and the bony thorax are the:
Sternoclavicular joints
What forms the sternoclavicular joint?
The clavicles meet the manubrium laterally to the jugular notch
What ribs connect directly to the sternum
The first 7
What is costocartilage?
A short piece of cartilage that articulates with the facets of the sternum
How do ribs 8-10 articulate with the sternum
Connect to the number 7 costocartilage
What ribs have no costocartilage?
11-12
What ribs are true? False?
True: 1-7
False: 8-12