dissection - thorax wall and muscles respiration Flashcards
muscles involved in respiration
pectoral major scalene sternocleidomastoid intercostal mucscles (internal/external) diaphragm
what is contained in intercostal spaces
intercostal muscles
intercoastsl neurvasucular bundles
fibres of external/intercostal muscle direction
external- downwards and forwards from the inferior border of the rib to superior border
internal - right angle to external
quiet inspiraton
external IC muscles contract
diaphragm contracts
sternum upwards and outwards
increased vol of thorax, decreased pressure
quiet expiration
passive elastic recoil of lung
diaphragm and IC relaxes
decreased vol, increased pressure
forced inspiration
accessory muscles:
contract scalenes - acts on first rib
sternocleidomastoid - pulls up sternum
pectoral muscles - elevate ribs
contraction of external IC
forced exhalation
accessrou muscles
abdominal muscles - pull lower ribs, compress abdominal contents
diagpham pushed up
internal IC contract
nerves in repsiration
intercostal nerves
directly connect to structures supplied
mixed nerves
T2-12spinal nerves
T2 - skin of underarm
T3-6 - intercostal muscles and skin of lateral/anterior chest wall
T7-12 intercostal muscles and abdominal muscles
arteriole supply to IC space
posterior thoracic aorta got posterior intercostal arteries subclavian artiery anterior internal thoracic artery
what do internal thoracic parties supply
diaphragm
anterior abdominal wall
mammary gland in females
diaphragm
central tendon
periphery skeletal muscular
partially fixed with fibrous pericardium
dipghram openings
aortic
oesophagus - vagus passes through
caval opening - inferior vena cava through CT
branches of phrenic nerve
innervation of diagram
phrenic nerve C3,4,5
motor and sensory
skin areas supplied by intercoastal sensory nerves
anterior lateral parts of dermatome (skin)
