Chest and Lungs Flashcards
(98 cards)
Parts of the thorax:
- Sternum
- Ribs
- Costal cartilages
Flat bone
Sternum
Sternum is divided into three parts:
- Manubrium
- Body
- Xiphoid process
Forms upper part of sternum.
Manubrium
Where does the manubrium articulate?
With the body of the sternum at the manubriosternal joint
Where does the body of the sternum articulate?
- With the manubrium (above) and xiphoid process (below)
- With 2nd (lower half) to 7th ribs
Thin plate of cartilage; no ribs or costal cartilages are attached.
Xiphoid process
Xiphoid process during its adult life:
becomes ossified at its proximal end
Formed by articulation of manubrium with body of sternum; important clinical landmark.
Sternal angle (Angle of Louis)
Sternum - important clinical landmark:
- 2nd costal cartilage
- Intervertebral disc between T4 and T5.
- Junction between the aortic arch and the ascending and descending aorta.
- Bifurcation of the trachea
- Junction of superior and inferior mediastinum.
How to locate the sternum:
- Insert your finger into the suprasternal notch (superior end of sternum).
- Slide fingers down the manubrium (~5cm) until it encounters a transverse ridge (sternal angle).
How many pairs of ribs are there?
12 pairs
Attached posteriorly to the thoracic vertebrae.
Ribs
The ribs are divided into three categories:
- True ribs
- False ribs
- Floating ribs
1st to 7th pairs; attached to the sternum by their costal cartilages.
True ribs
Ribs 8th to 10th, attached anteriorly to each other.
False ribs
They are also attached to the
7th rib by their costal cartilages and small synovial joints.
False ribs
Ribs 11th and 12th; no anterior attachment.
Floating ribs
Bars of cartilage
Costal cartilages
Costal cartilages connects:
- Upper 7 ribs to lateral edge of sternum.
- 8th-10th ribs to cartilage above them.
11th-12th ribs end in:
abdominal musculature
Lower border of the lung crosses the:
6th rib at the midclavicular line and 8th rib at midaxillary line
Inspiration and expiration are accomplished by:
- Increase and decrease of thoracic cavity capacity.
- Physiologic rate (16-20 cpm)
Mechanics of respiration:
- Quiet inspiration
- Forced inspiration
- Quiet expiration
- Forced expiration