Q10 Diaphragm

Question 1

State the position and shape of this muscle

Answer 1

Dome shaped concave downwards, separates the thoracic and abdominal cavities

Question 2

State the attachments of this muscle to the thoracic outlet

Answer 2

Lumbar section- Right Crus from L1 -3 bodies and discs.
Left crus L1-2
Coatal section- internal aspects of lower 6 ribs and costal cartilages.
Sternal section- posterior aspect of Xiphoid process

Question 3

Describe, in sequence the action of this muscle on the thoracic diamenters

Answer 3

It incresase the thoracic diameter, first by central tendon descending (vertical), then lower ribs move outwards (Transverse) and sternum is moved forwards (A-P)

Question 4

Identify one other functional activity apart from breathing that this muscle plays an important role

Answer 4

Expulsive acts (Vomiting, sneezing etc)
Supports lumbar spine
Assists venous/lymphatic drainage