Muscles of Respiration Flashcards
What are the 3 types of breath?
Quiet inspiration, forced inspiration, and forced expiration
Where is the diaphragm located?
Separates the thoracic and abdominal cavities
What is another name for foramen?
Hiatus
What is the origin of the diaphragm?
Internal surface of ribs 7-12 (costal cartilages), inner inferior surface of xiphoid process, upper lumbar vertebrae.
What is the insertion of the diaphragm?
Central tendon
What is the action of the diaphragm?
primary mover of inspiration; increases vertical dimension of thorax; increases intra-abdominal pressure
What is the function of the phrenic nerve?
Mediates both sensory and motor information for diaphragm
What are the external intercostal muscles?
Deep muscles of the thorax
What is the action of the Interchondral portion of Internal intercostal muscles?
Expands the ribcage
What are the 3 categories of accessory muscles?
Dorsal (Posterior) thorax, Ventral (Anterior) thorax,
Neck
Where is the Latissimus dorsi and what does it look like?
Crests of sacrum and ilium, big and flat muscle
What is the action of the trapezius?
maintains trunk stability for respiration
What is the action of the pectoralis major?
with arm fixed, pulls sternum and ribs upward during forced inspiration
What is the action of the pectoralis minor?
with scapula fixed, elevates ribs 3-5
What is the action of Sternocleidomastoid
raises sternum, and thus elevates ribs
What is the action of levatus scapulae?
elevates scapula
What is the action of the rhomboids?
elevates scapula
Contraction of deep thoracic muscles _____ anterior-posterior and transverse dimensions
decreases
Contraction of abdominal/back muscles decreases _____ (vertical) dimension.
superior-inferior
Where is the linea alba?
runs vertically from xiphoid process of sternum to pubic symphysis in pelvic girdle
Which muscles compress abdomen and rib cage?
Rectus abdominis,
External oblique abdominis,
Transversus abdominis,
Internal oblique
Which muscles partake in both inspiration and expiration?
Latissimus dorsi, Iliocostalis thoracis
Action of the Lateral iliocostalis cervicis?
elevates ribs
Action of Lateral iliocostalis thoracis?
stabilizes back wall of ribcage with lateral iliocostalis cervicis
Action of Levatores costarum brevis and longus?
Eleveates ribs
Action of Serratus posterior superior?
elevates rib to which it attaches
Action of Latissimus dorsi?
with arm fixed, raises lower ribs
Action of subclavius?
Elevates first rib
Action of scalenes?
`Elevates the ribs
Action of Transversus abdominis?
Compresses abdomen and rib cage
Action of the Internal oblique?
compresses abdomen and rib cage
action of Quadratus lumborum?
pulls last rib inferiorly during expiration
Action of Lateral Iliocostalis lumborum?
Depresses lower six ribs
