Topic 27 - Diaphragm

Question 1

The 5 layers of diaphragm

Answer 1

Pleura
Fascia endothoracica
M.phrenicus
Fascia transversa abdominis
Peritoneum

Question 2

M.phrenicus

Answer 2

From corona muscularis. Pars costalis, pars lumbaris and pars sternalis.

Question 3

Capula/dome - capsula diaphragmatica

Answer 3

The most cranial part of the diaphragma´s curve, which projects into thoracic cavity.

Question 4

Arcus lumbocostalis and trigonum lubocostalis

Answer 4

An arch which connects lumbal and costal part. Beside this there is a triangular region where m.phrenicus is absent.

Question 5

Centrum tendinosum

Answer 5

Central tendinous plate where the parts of m.phrenicus meets. Has an opening for caudal vene cava between thoracic and abdominal cavity - foramen venae cavae.

Question 6

Pars lumbaris

Answer 6

Consist of crus dexter and crus sinister, which are arising from the 3-4 L.vertebrae and together forming an opening for aorta - hiatus aorticus. Is the crus dexter is thicker, it extends more ventrally and surrounds oespphagus - hiatus oesophageus.

Question 7

Action of diaphragm

Answer 7

Most important inspiratory muscle. Also helps increasing abdominal pressure.