Respiratory Flashcards
what is the ventral boundary of the thoracic cavity?
sternum
what is the dorsal boundary of the thoracic cavity?
vertebral column
what is the caudal boundary of the thoracic cavity?
costal arch
what is the cranial boundary of the thoracic cavity?
thoracic inlet (1st pair of ribs, T1, manubrium)
what is the lateral boundary of the thoracic cavity?
ribs
what is the thoracic cavity lined with?
pleural membranes
what is pulmonary ventilation dependent on?
atmospheric pressure, alveolar pressure and intrapleural pressure
what do ribs articulate with dorsally?
thoracic vertebrae
what do ribs interject with ventrally?
junction of 2 sternebrae
what is the costochondral junction?
where the cartilaginous portion of ribs meet the bony portion
what forms a barrier to prolapse of nucleus pulposus?
intercapital ligaments
what do the intercapital ligaments run between?
T2 and T10
what does the rib tuberculum articulate with?
transverse processes
what is the name of the head of rib?
capitulum
what does the capitulum articulate with?
centra of 2 adjacent vertebrae
what sort of joints are costovertebral joints?
synovial joints
what muscles are involved in inspiration?
diaphragm, external intercostals, ‘minor’ muscles
what muscles are involved in expiration?
elastic recoil of lungs, relaxation of diaphragm, internal intercostals, abdominal muscles, ‘minor’ muscles
which direction do the fibres of external intercostal run?
dorso-cranially to ventro-caudally
which direction do the fibres of internal intercostal run?
dorso-caudally to ventro-cranially
what is the pivotal point of ribs?
synovial joint
what is the diaphragm?
muscular partition between thoracic and abdominal cavities
what does the diaphragm consist of (2)?
muscular periphery, Y-shaped tendinous centre
what does the muscular part of the diaphragm consist of?
lumbar part, costal part, sternal part
what does the lumbar part of the diaphragm originate from?
lumbar vertebrae 3&4 via strong tendons
what does the costal part of the diaphragm originate from?
medial surfaces of the caudal ribs (8-13 in dog)
where do all of the parts of the diaphragm insert?
on the central tendon
what does the sternal part of the diaphragm originate from?
dorsal surface of the caudal sternum
what is the diaphragm innervated by?
left and right phrenic nerve, cervical nerves 5,6,7
what do the left and right phrenic nerve follow?
septum tranversum
what are the diaphragm hiati?
aortic, oesophageal, caval
what passes through the aortic hiatus?
aorta, thoracic duct, azygous vein
what passes through the oesophageal hiatus?
oesophagus, vagus
what is the name of the branch of the subclavian artery that supplies intercostal spaces 1-3?
costocervical artery
what does the costocervical artery supply?
intercostal spaces 1-3
what is the costocervical artery a branch of?
the subclavian artery