Heart/Lung Development Flashcards
lining of the respiratory system is derived from which embryological tissue
endoderm
all respiratory tissue other than the lining is derived from which embryological tissue
mesoderm
expression of what gene in the foregut directs the positioning of the lung bud on the esophagus (position of the respiratory diverticulum
Tbx4
the lung bud begins as an outgrowth of the foregut into surrounding splanchnic mesoderm. what does the foregut become in a developed fetus?
esophagus
what structure separates the esophagus from the trachea
tracheoesophageal septum
what structure dictates entry to the digestive versus the respiratory system
epiglottis
improper formation of the tracheoesophageal septum between trachea and esophagus leads to what clinical abnormality
tracheoesophageal fistula
the diverticulum forming the lung bud arises on the ___ side of the foregut during development
ventral
a(n) ____ is an abnormal opening between two structures whereas a(n) ___ is an abnormal closing between structures
fistula, atresia
high volume of amniotic fluid is called _____ and could mean the fetus has CNS problems or what gastrointestinal abnormality
polyhydramnios, esophageal atresia
there are the same number of secondary bronchi as there are ____ in the lungs
lobes
the embryological ________ differentiates into smooth muscle, nerves, and blood vessels of the lungs
splanchnic mesoderm
infants in what stage of development (wk 17-26) are capable of surviving outside the womb because lung formation is nearly complete
canalicular
what are the stages in lung development
embryonic, pseudo-glandular ,canalicular* terminal sac ,postnatal
stage of lung development where initial formation of respiratory diverticulum occurs and lasts until all bronchopulmonary segments have formed (differentiation of the pleura)
embryonic stage
stage of lung development where duct systems within bronchopulmonary segments form and grow (still no gas exchange)
pseudo-glandular stage
Most essential stage of lung development where we get formation of respiratory bronchioles and terminal sacs/ primitive alveoli. vascularization increases
canalicular stage
epithelium lining alveoli develop into what type of specialized cell that form part of blood-air barrier
type I pneumocytes
epithelium lining alveoli develop into what type of specialized cell that secrete surfactant
type II pneumocytes
stage of lung development where 90% of alveoli have formed and septation of those alveoli occurs
postnatal phase (alveolar)
issues in lung development that result in labored breathing, deficient surfactant, incomplete expansion or collapse of lung
infant respiratory distress syndrome (IRDS)
complete absence of lungs, bronchi, and corresponding vasculature (can be uni- or bilateral)
pulmonary agenesis
poorly developed bronchial tree (possibly due to hole in the diaphragm)
pulmonary hypoplasia
pulmonary hypoplasia (poorly developed bronchial tree) can develop as a result of abdominal contents herniating into thoracic cavity due to this abnormality
congenital diaphragmatic hernia
what primitive structure eventually becomes the diaphragm
septum transversum & pleuroperitoneal membrane
congenital diaphragmatic hernia can be caused by failure of _______ to fuse (most commonly on left side) causing flat abdomen, breathlessness, cyanosis
pleuroperitoneal membranes
first system to function in a developing embryo (necessary for rapid growth)
cardiovascular
communications between the left and right _________ tubes provides the framework upon which the developing heart forms
endocardial
the embryonic heart receives input from which 3 systems? which of these will be maintained and reworked for the functioning adult heart?
cardinal*
umbilical
vitelline
the embryonic vascular circuit is made of aortic arches that connect to ________ which subdivide to supply the entire embryo
dorsal aortae
embryonic circuit that supplies and drains yolk sac while it functions to create blood cells
vitelline arteries and veins
embryonic circuit that facilitates exchange of blood between mom and baby
umbilical (placental) circuit
adult structure corresponding to embryonic truncus arteriosus
aorta, pulmonary trunk
adult structure corresponding to embryonic bulbs cordis
smooth part of right (conus cords) and left (aortic vestibule) ventricles
adult structure corresponding to embryonic primitive ventricle
trabeculated part of right and left ventricle
adult structure corresponding to embryonic primitive atrium
right and left auricles
adult structure corresponding to embryonic sinus venosus
smooth part of right atrium, coronary sinus, oblique vein of left atrium
structure that forms in the middle of a developing heart as an anchor for chamber walls and valves (dorsal and ventral blocks of tissue grow together)
endocardial cushions
folding in of _____ about the fulcrum causes formation of truncus arterioles, bulbus cords, and primitive atria and ventricle
aortic arches
primordial arterial and venous ends of the heart are brought together during folding to form transverse _____
pericardial sinus
condition in which the heart bends to the left instead of the right causing transposition. common, not harmful.
dextrocardia
failure of endocardial cushions to close causing communication between chambers
atrioventricular communis
the muscle portion of the ______ develops on the midline of the floor of the primitive ventricle and grows upward toward endocardial cushions and is closed by membranous portion.
intraventricular septum
25% of heart defects are _______ in the membranous portion which cannot close itself like the muscular portion can. can cause shunting of blood
ventricular septal defects
when the intertribal septum forms, it leaves a small opening called the _____ replacing the foramen secundum
foramen ovale
after birth the pressure in the left atrium exceeds that of the right atrium when we first inflate the lungs forcing the foramen ovale to close. when it leaves a small space we say the foramen is what
patent
the heart begins formation as a _____ and eventually becomes a ____ structure
2, 4 chambered
the right horn of the ____ enlarges as blood is shunted from left to right as systemic inflow (vitelline and umbilical) is moved to the right side in the developing heart
sinus venosus
the first shunt in the developing circulation system is the vitelline veins as they incorporate into the ____
liver
the second shunt in the developing circulation system is the ______ as it loses direct connection to the heart and joins the ductus venosus
umbilical
this structure is joined by the umbilical vein and bypasses the liver to deliver oxygenated blood to the developing heart
ductus venosus
when anterior cardinal veins become connected the new anastemosis becomes what adult vein
brachiocephalic
right anterior and common cardinal vein join to become what adult vein
superior vena cava
the lateral horn of sinus venosus becomes what adult vein
coronary sinus
______ are necessary to form aorticopulmonary septum as they invade ridges that form in bulbs cords and truncus arteriosus
neural crest cells
disease characterized by following symptoms: pulmonary stenosis, ventricular septal defect, overriding aorta, and right ventricular hypertrophy
tetralogy of fallot
arterial system develops from 6 pairs of aortic arches. #__ contributes to left side of the aortic arch and #__ contributes to the pulmonary trunk
4, 6
the ______ closes at birth to become the ligamentum arteriosum
ductus arteriosis
abnormal connection between aorta and pulmonary artery in heart
patent ductus arteriosis