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RAD 121

Ch. 10 Bony Thorax-Sternum and Ribs

What are the structures that make up the bony thorax? a. Sternum b. Thoracic vertebrae c. 12 Pairs of Ribs
What is a thin, narrow, flat bone? sternum
How many divisions does the sternum have? 3
What are the divisions of the sternum? 1. Manubrium 2. body 3. Xiphoid Process
What is the total length of an adult sternum? 7 inches
What is the upper portion of the sternum? manubrium
How big is the adult manubrium? 2 inches in length
What is the longest part of the sternum? body
When does the union of the 4 segments of the sternum begin? When is it complete? begins during puberty and is complete by age 25
What is the inferior part of the sternum? the xiphoid process
When does the xiphoid process become totally ossified? around age 40
What is the uppermost border of the manubrium? jugular notch
The jugular notch is at the level of what? T2-3
What do the lower end of the manubrium and the superior part of the body of the sternum form? sternal angle
The sternal angle is located at the level of what disk space? T4-5
The xiphoid process corresponds to what level of the vertebra? T9-10
What level of the vertebra does the inferior rib angle correspond to? L2-3
Anatomically speaking, how does each clavicle articulate with the manubrium? laterally
What is it called where the clavicles articulate with the manubrium? clavicular notch
What connects directly to the sternum? the clavicles and the first 7 pairs of ribs
What is located below each clavicular notch and sternoclavicular joint? a depression or facet for articulation with the cartilage of the first rib
Do the anterior ribs unite directly to with the sternum? no
What is the cartilage that connects the anterior ribs to the sternum? costocartilage
Where does the second costocartilage connect to the sternum? the level of the sternal angle
Which costocartilages connect to the body of the sternum? 3rd-7th
Do ribs 8, 9, and 10 connect to the sternum via costocartilage? no
What ribs are considered true ribs? 1-7
What ribs are considered false ribs? 8-12
What ribs are considered floating ribs? 11 and 12
How do the true ribs attach to the sternum? directly by its own costocartilage
How do the false ribs connect to the sternum? They each have costocartilage which attaches to the costocartilage of the 7th rib
What ribs do not possess costocartilage? 11 and 12
What are ribs 1-7 termed? true ribs
What are the two ends of each rib? 1. vertebral end 2. sternal end
What is the posterior end of the rib called? vertebral end
What is the anterior end of the rib called? sternal end
What is between the two ends of each rib? body or shaft
What does the vertebral end of the rib consist of? head and neck
What is lateral to the neck on the ribs? an elevated tubercle
What does the elevated tubercle articulate with? the transverse process of vertebra and also allows attachment of a ligament
What is the area of forward angulation? the angle
How much higher is the posterior or vertebral end of a typical rib in relation to the anterior or sternal end? 3 to 5 inches
What does the inside margin of each rib protect? 1. an artery 2. a vein 3. a nerve
What is the inside margin of each rib which contains blood vessels and nerves? costal groove
Where is the bony thorax typically the widest? at the lateral margins of the 8th or 9th ribs
What is the joint between the costcartilage and the sternal end of the rib called? costocondral union (or junction)
What type of joint is the costocondral union or junction? synarthrodial, no movement
What type of joint is the sternoclavicular joint? synovial-gliding motion,
Which sternocostal joints are cartilaginous or synchondrosis type? the sternocostal joint of the first rib
Which sternocostal joints are synovial and allow a slight plane or gliding motion? the second through seventh joints
Where are the interchondral joints located? between the costcartilages of the anterior sixth through ninth rib
What are the ninth and tenth cartilage joints called? What are they classified as? interchondral joints, fibrous joints
What are the joints between the ribs and the vertebral column? costotransverse joints and costovertebral joints
What are the costotransverse joints classified as? synovial, plane or gliding motion
On what ribs are costotransverse joints found? first through tenth rib
On what ribs are the costovertebral joints found? all of them
Created by: eheaden



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