Week 4 Flashcards
(120 cards)
Thoracic cage: what is it how how is it defined?
Bony structute with a conical shape which is more narrow at the top
- sternum, 12 pairs of ribs and 12 thoracic vertebrae
Diaphragm
Flood the of thoracic cage, a musculotendinous septum that separates thoracic cavity from abdomen
Describe the different types of ribs
First 7 ribs are attached to sternum by costal cartilages
Rubs 8-10 are attached to costal cartilage above
Ribs 11 and 12 are “floating” with free palpable tips
Costochondral junctions
Points at which ribs join their cartilages; they are not palpable
Suprasternal notch
Hollow U-shaped depression just above sternum between clavicles.
Sternum
“Breastbone” has 3 parts — manubrium, body and xiphoid process
Manubriosternal angle
“Angle of Luis” at articulation of manubrium and sternum, and continuous with second rib
Each intercostal space is numbered by what
Each intercostal space is numbered by rib above it
What does the Angle of Louis mark?
The site of tracheal bifurcation into right and left main bronchi; corresponds with upper border of atria of the heart and it lies above 4th thoracic vertebra on back
Costal angle
The right and left costal margins form an angle where they meet at the xiphoid process
— usually 90 degrees or less, increases when rib cage is chronically overinflated, as in emphysema
What are reference lines you can imagine on your patient when they are facing anteriorly?
Anterior axillary line, midclavicular line, midsternal line (lateral to medial)
What are lines you can imagine on your patient when they are facing you posteriorly?
Scapular line, vertebral line (lateral to medial)
What are lines you can imagine on your patient when you are looking at them from the side?
Posterior axillary line, mid axillary line, anterior axillary line
Anterior axillary line
Extends down from anterior axillary fold where pectoral is major muscle inserts
Posterior axillary line
Continues down from posterior axillary fold where latissimus Doris muscle inserts
Midaxillary line
Runs down from apex of axilla and lies between anterior and posterior axillary lines
Mediastinum
Middle section of thoracic cavity containing esophagus, trachea, heart and great vessels
Right and left pleural cavities
Encase lungs
Lung borders
In anterior chest, apex of lung tissue is 3 of 4 cm above inner third of clavicles
Laterally, the lung tissue extends from apex of axilla down to that
7th or 8th rib
Posteriorly, the location of C7 marks what?
Apex of lung tissue, and T10 usually corresponds to base
— deep inspiration expands lungs, and their lower border drops to level of T12
Why is the right lung shorter than the left
Because liver is under it
Why is the left lung more narrow then the right
Heart bulges to the left
How many lobes does each lung have?
Right = 3 Left = 2