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
Ribs characterisitcs:
Vertebral end attaches to:
Thoracic vertebra
Rib characteristics:
Sternal end attaches to:
Sternum
How is the rib shaft angled?
Downward and foward; termed “angle of the rib”
What are the characteristics of the vertebral end of the rib?
Consists of a head which attaches to 1 or 2 tspine, the neck is a flattened part, lateral to the neck is a tubercle which articules with the transverse process of the t-spine vertebrae
The vertebral end of a rib is typically ____ inches higher than the sternal end
3-5 inches
What is the lower inside margin of the rib called?
Costal groove
