18 terms

muscles of inspiration and expiration

primary muscles of inspiration during relaxed breathing
diaphragm, external intercostals
dome shaped muscle that divides thoracic and abdominal cavities
diaphragm during inspiration
contracts pulling floor of thoracic cavity inferiorly
diaphragm attachment
xiphoid process, lower 6 ribs, lumbar vertebrae creating central tendon
quiet inspiration
central tendon moves very little
forced inspiration
central tendon descends up to four inches
Major diaphragm apetures (openings)
venal cava foramen, esophageal hiatus, aortic hiatus
external intercostals location
most superficial layer - form V shape bilaterally between bottom of one rib to rib below
external intercostals function
elevate ribs during inspiration (bucket handle)
accessory muscles of inspiration
serratus anterior, pec major, pec minor, upper trap, levator scapulae, SCM, scalenes, rhomboids, serratus posterior superior, levator costarum
elevate muscles during forced inspiration
accessory muscles of inspiration
serratus posterior superior
A- C7 - T3 and ribs 2 - 5. In.- 2-5 intercostal nerves
internal intercostals
primary muscle of expiration
internal intercostals location
between ribs deep and oriented at a right angle to external intercostals, continuous with internal obliques
internal intercostals function
depress ribs during expiration
accessory muscles of expiration
rectus abdominus, external obliques, internal obliques, transversus thoracis, serratus posterior inferior, quadratus lumborum
can help with inspiration and expiration
latissimus dorsi
serratus posterior inferior
A- spinous processes T11 - L3, ribs 9-12, In- 9-12 intercostal nerves