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[ Home ] [ Up ] [ Anterior Body Wall ] [ Embryonic Body Cavity ] [ Lunglecture ] [ Mediastinum ] [ Heart ] [ Autonomic NS ] [ Rotation of the Gut/Abdomen ] [ Abdominal-Peritoneal Cavities ] [ Glands ,Lymphoid Organs and Blood Supply ] [ Pelvic Cavity ] [ Posterior body wall ] [ Perineum ]
Introduction to Thoracic cavity
First – what is
the thorax?
Two – how does it develop?
Three – what’s in it
Four – Lungs -Adult configuration- fetal
Five – Mediation
Six – Heart – Adult configuration – fetal –
changes at birth
What is the thoracic cavity?
Body cavity in upper
part of torso
Extends from diaphragm to root, vertebral column to sternum, rib
to rib
What’s in it?
Contains –
heart, lungs, vessels, nerves
Separated in smaller "sacs"
How does it develop?
Embryonic Body Cavity
Intraembryonic
ceolom – body cavity
Gives rise to three
cavities (week 4)
Pericardial
Pericardioperitoneal canals
Peritoneal cavity
Thorax/Abdomen
Pericardoperitoneal canals
lateral to foregut and dorsal to septum transversum
Septum transversum is primordium of central tendon of diaphragm
Partitions form in canals and separate pleural and pericardial
cavities,
Pleuroperitoneal folds enlarge, become membranous
Eventually separate pleural and peritoneal cavities
Development of diaphragm
Composite structure
Develops from
Septum
transveeurorsum, Pleuroperitoneal membrane, Dorsal mesentery of esophagus, Lateral body
walls
ST grows dorsally
from ventrolateral body wall, Separates heart from liver
PPM fuses with DME completing partition between thorax and
abdomen, forms primordial diaphragm, large portion of fetal diaphragm, small portion
infant’s
DME constitutes median part of diaphragm, crura from myoblasts
that grow into this
Body wall splits into 2 layers
External – becomes body wall
Internal – contributes to peripheral
Development of diaphragm
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