Lower Respiratory Tract lecture Flashcards
Parietal Pleura
- lines pleural cavity, several names for the surfaces it covers
- innervated by intercostal nerves and phrenic nerves
- forms pulmonary ligament
Costal Pleura
Part of parietal pleura, attached to ribs and intercostal spaces
Mediastinal pleura
part of parietal pleura, attached to mediastinum
Diaphragmatic pleura
part of parietal pleura,adheres to superior surface of respiratory diaphragm
Cervical pleura
part of parietal pleura,lines pleural cavity above level of 1st ribs, in root of neck
Visceral Pleura:
covers surfaces of lungs, insensitive to pain
Connecting Layer
- surrounds roots of lungs like a sleeve
- covers structures that pass into lungs (bronchi, nerves, lymphatics, etc)
Vertical Reflection
where costal and mediastinal pleurae become continuous posteriorly
Sternal Reflection
costal and mediastina pleurae become continuous anteriorly
Costal Reflection
costal and diaphragmatic pleurae become continuous inferiorly
Describe the lines of reflection of the parietal pleura.
Vertical, sternal, costal reflection
pleural recesses
- occur where two layers of parietal pleura form an acute angle,in direct contact with each other
- lungs not in these recesses normally, but with certain infections can be filled with pus
Right Costodiaphragmatic Recess
located laterally along costal reflection, allow lungs to be pulled during inspiration
Left Costodiaphragmatic Recess
located laterally along costal reflection, allow lungs to be pulled during inspiration
Left Costomediastinal Recess
located anteriorly along sternal reflection, where costal and mediastinal pleurae meet
Pleural Cavities
- Spaces between two pleural layers
- contains pleural fluid which is secreted by the pleural membranes
Pleural Sacs
- Beneath visceral pleura
- contains lungs
Intercostal nerves
supply fibers for pain and irritation to costal pleura in addition to supplying the periphery of the respiratory diaphragm
Phrenic nerves
supply fibers for pain and irritation to the mediastinal pleura and the diaphragmatic pleura.
lower respiratory tract components?
- Begins with trachea, main stem bronchi, bronchial tubes, and lungs
- Trachea, bronchi, bronchial tubes contain ciliated pseudostratified columnar epithelium
- Cilia move up mucous toward laryngopharynx, where it can be coughed up
course of the trachea from the neck into the superior mediastinum
- continuous with larynx
- extends from C6 vertebrae to sternal angle at same level as T4
- transverse thoracic plane passes through sternal angle to intersect intervertebral disc between T4 and T5, bifurcates trachea into two main bronchi
Describe the composition of the trachea
- 20 “U shaped” cartilage rings, dont go all the way around trachea
- smooth muscle: elastic posterior wall of trachea, next to esophagus
- mucous glands keep surface of epithelium covered with mucous
Arteries of trachea
superior and inferior thyroid arteries
Veins of trachea
superior, middle and inferior thyroid veins
Right main bronchi
Larger diameter, more vertical, shorter, 3 lobar bronchi to lungs, branches into 10 segmental bronchi
-runs under arch of azygos vein
Left main bronchi
Small diameter, less vertical, longer, 2 lobar bronchi to lungs, 8 segmental bronchi
-runs under left pulmonary artery
Tertiary bronchi
go to bronchopulmonary segments
How many segmental bronchi do right and left lungs have?
Right lung has 10 segmental bronchi
Left lung has 8 segmental bronchi