Abdominopelvic cavity Flashcards
General function of abdominopelvic cavity
-contraction of muscular roof, floor, walls of “container”
-increases intra-abdominal pressure
-aids in expiration
-aids in expulsion of fluid, flatus, feces, and fetuses
Respiratory diaphragm
-closes inferior thoracic aperture
-separates abdominopelvic cavity from thoracic cavity
Respiratory diaphragm attaches to:
-osteological boundaries of inferior thoracic aperture (costal margin, xiphoid process, floating ribs)
-superior lumbar vertebrae
Structure of resp diaphragm
-Right dome contains liver and pushes upwards
-Left dome is pushed down by heart
-Contains central tendon, sternal muscle, costal muscle, lumbar muscl
-Right and left crus
-Apertures
Crus
Musculoteninous bands arising from lumbar vertebrae and anchor resp diaphragm to lumbar vertebrae
Caval opening
-Inferior vena cava
-Most anterior
-Level T8
Esophageal hiatus
-Esophagus
-Middle
-Level T10
Aortic hiatus
-Aorta
-Located between crus
-Opening posterior to diaphragm
-Not a true opening
-Level T12
Respiratory diaphragm during inspiration
-Contracts, flattening domes
-Domes descend
-Increases vertical dimension of thoracic cage
-Allows inspired air to fill lungs
Respiratory diaphragm increasing intra-abdominal pressure
-Contraction increases IA pressure
-Increases IA pressure pushes diaphragm back upwards
-Results in forced expiration
Inferior vena cava and central tendon during inspiration
-IVC adheres to caval opening
-Central tendon pulls and widens caval opening
-Dilates inferior vena cava
-Facilitates blood flow back to heart
What happens to esophagus during inspiration?
-Muscular lumbar part contracts and constricts esophagus
Superficial to deep: layers of abdominal wall
-Skin
-Subcutaneous tissue
-Muscles and aponeuroses, deep fascia
-Transversalis fascia
-Extraperitoneal fat
-Parietal peritoneum
Flat muscles of abdominal wall
-External obliques
-Internal obliqyes
-Transversus abdominis
Vertical muscle of abdominal wall
-Rectus abdominis
-Pyramydalis
Aponeurosis
sheet of white fibrous tissue that takes the place of a tendon in flat muscles having a wide area of attachment