The Diaphragm - The Muscular System

How does one hold their breath

By a steady contraction of the diaphragm

Reproductive Tract Definition

Childbirth

Why is the superior surface of the diaphragm convex

Creates elevated floor of the thoracic cavity

Why is the inferior surface of the diaphragm concave

Creates the curved roof of the abdominal cavity

Intestinal Tract Definition

Defecation

Examples of valsalva maneuver

Defecation; Urination; Childbirth

The inferior side of the pericardial sac and the inferior surfaces of the pleural membranes do what

Fuse onto the central tendon of the diaphragm

The skeletal portions of the diaphragm do what

Insert into the tendon while having a number of origins

Caval Opening Definition

Opening in the diaphragm that allows inferior vena cava to pass through; foramen for the vena cava

Pleural Membranes Definition

Parietal pleura

Diaphragm Definition

Skeletal muscle that separates the thoracic and abdominal cavities and is dome-shaped at rest

What are to the sides of the tendon

Skeletal portions of the diaphragm

What does a steady contraction of the diaphragm do

Stabilize the volume and pressure of the peritoneal cavity

What happens when the pressure cannot push the diaphragm up

The abdominal muscles increases pressure on the intestinal tract, urinary tract, or reproductive tract

What is the change in volume of the thoracic cavity due to

The alternate contraction and relaxation of the diaphragm

The diaphragm includes three openings for the passage of structures between the thorax and the abdomen - aorta, thoracic duct, and azygous

The aorta, thoracic duct, and azygous vein pass through the aortic hiatus of the posterior diaphragm

Valsalva Maneuver Definition

The cooperation between the diaphragm and the abdominal muscles

The diaphragm includes three openings for the passage of structures between the thorax and the abdomen - esophagus

The esophagus and attached nerves pass through the esophageal hiatus

The diaphragm includes three openings for the passage of structures between the thorax and the abdomen - inferior vena cava

The inferior vena cava passes through the caval opening

The diaphragm includes three openings for what

The passage of structures between the thorax and the abdomen

What happens when the abdominal muscle contracts

The pressure cannot push the diaphragm up

Urinary Tract Definition

Urination