Lungs and Pleural Cavities Flashcards
Stage 2 of development
Lung buds push against pleura (which become visceral pleura adherent to organ surface)
Stage 1 of development
Pleural cavity develops from coelomic space and lined by coelomic membrane (pleurae)
Contents of pleural cavity
Serous fluid. NOT LUNG
Stage 3 of development
Further growth of lung ⬇️ size of pleural cavity.
Bronchi and blood vessels to lung become covered w pleura
Endothoracic fascia
Layer of fascia separates rib and intercostal muscles from parietal pleura
Mediastinal pleura
Pleura in middle of lungs
Costal pleura
Adjacent to ribs
Diaphragmatic pleura
Pleura adj to diaphragm
Cervical pleura
Pleura adj to cervical vertebrae
Pleural Cavity Recesses clinical
Areas where fluid, etc can become trapped.
Normally air filled
Costodiaphragmatic recesses
on RT and LT. split like space near costodiaphragmatic pleura (anterior)
lungs DO NOT enter this space
Inferior border of pleura
Rib 8–> rib 10–> T12 as move anterior to posterior
Costomediastinal recess
near costomediastinal pleura location (LT»>RT)
anterior margin of Lungs ENTER during inspiration
Superior border of pleura
1” above costal cartilage 1
External pneumothorax
Air enters pleural cavity from channel thru thoracic wall made by knife wound
Internal pneumothorax
Air enters pleural cavity from rupture of air tubes at surface of lungs
Hemothorax
Blood in pleural cavity
Pyothorax
Pus in pleural cavity
Hydrothorax
CHF causes increased tissue fluid in cavity
Chylothorax
Lymph due to tear in thoracic duct
Pleurisy
Inflammation,
Fibrous adhesions on pleura result in “friction rub” (audible)
Referred pain from pleura
Phrenic nerve (C3-C5)
Costal pleura innerv.
Intercostal n.
Mediastinal pleura innerv.
Phrenic n.
Respiratory system development stage 1
Larngyotracheal tube bifurcated into lung buds which form 1. Main bronchi –> lobar bronchi –> segmental bronchi
Respiratory system development stage 2
Endoderm forms linings of airway.
Splanchnic mesoderm forms CT, cartilage, and muscles of airways
Respiratory system development stage 3
Pleural cavity forms from intraembryonic coelom
Pleural membranes form from lateral mesoderm
Parietal pleura
Formed from intraembryonic somatic mesoderm
Lines inner thoracic wall
Visceral pleura
Forms from intraembryonic splanchnic mesoderm
Covers lung surface
Esophageal atresia
Absence of normal lumen
Esophageal atresia clinical
Polyhydramnios in fetus
Fluid doesn’t reach small intestine for absorption
Tracheoesophageal fistula
Abnormal channel btwn 2 structures
Rt Lung gross anat
Superior Lobe, horizontal fissure (@rib 4), Middle lobe, oblique fissure, inferior lobe