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USMLE Step 1 Embryology
DIT Embryology
88
Medical
Graduate
05/15/2010

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Cards

Term
Which embryogenesis gene? Involved in patterning along the Ant-Post axis
Definition
Sonic Hedgehog Gene
Term
Which embryogenesis gene? Deficiency can lead to holoproscencephaly
Definition
Sonic Hedgehog gene
Term
Which embryogenesis gene? Achondroplasia is involved in deficiency of this gene
Definition
FGF gene
Term
Which embryogenesis gene? Involved in segmental organization
Definition
Homeobox gene (HOX)
Term
What teratogen alters HOX gene expression?
Definition
retinoic acid
Term
Which embryogenesis gene? Blueprint for skeletal morphology
Definition
HOX gene
Term
In what time frame does fetal organogenesis occur?
Definition
wks 3-8
Term
When is amniocentesis performed?
Definition
15-17 wks
Term
When is Chorionic Villus Sampling performed?
Definition
10-12 wks
Term
What divides the left and right atrium?
Definition
Septum primum and septum secundum
Term
In what week does the heart begin to beat?
Definition
Week 4, ~22 days
Term
When does the fetus begin to look like a baby?
Definition
wk 8
Term
What developmental structure? supplies oxygenated blood to the fetus
Definition
umbilical vein
Term
What developmental structure? removes nitrogenous waste f/ the fetal bladder
Definition
fetal urachus
Term
What developmental structure? fetal placental structure that secretes hCG
Definition
syncytiotrophoblast
Term
What developmental structure? maternal component of the placenta
Definition
decidua basalis
Term
What developmental structure? returns deoxygenated blood f/ the fetal internal iliac arteries
Definition
umbilical arteries
Term
What genetic abnormality is commonly associated w/ endocardial cushion defects?
Definition
trisomy 21 (Down's Syndrome)
Term
What embryologic structure is this derived from? ascending aorta and pulmonary trunk
Definition
truncus arteriosis
Term
What embryologic structure is this derived from? coronary sinus
Definition
left horn of sinus venosus
Term
What embryologic structure is this derived from? Superior Vena Cava
Definition
Rt common cardinal vein and rt anterior cardinal vein
Term
What embryologic structure is this derived from? smooth parts of the right and left ventricle
Definition
bulbus cordis
Term
What embryologic structure is this derived from? Smooth part of the right atrium
Definition
right horn of sinus venosus
Term
What embryologic structure is this derived from? trabeculated left and right atrium
Definition
primitive atria
Term
What embryologic structure is this derived from? trabeculated parts of left and right ventricle
Definition
primitive ventricle
Term
What structure divides the truncus arteriosis into the aortic and pulmonary trunkc?
Definition
aorticopulmonary septum
Term
What is the cellular origin of the aorticopulmonary septum?
Definition
neural crest cells
Term
Which bones are sites of RBC synthesis in adults?
Definition
vertebrae, sternum, ribs, pelvis, cranial bones
Term
What 2 adult structures are derived f/ the third aortic arch?
Definition
1. Common Carotid A
2. Proximal part of Internal Carotid A
Term
Which 2 adult structures are derived f/ the 4th aortic arch?
Definition
1. left: aortic arch
2. right: proximal part of rt subclavian
Term
Which 2 adult structures are derived f/ the 6th aortic arch?
Definition
1. proximal part of pulmonary arteries
2. (left) ductus arteriosis
Term
Which adult structures are derived f/ the 1st and 2nd aortic arches?
Definition
1st: part of MAXillary A
2nd: Stapedial and Hyoid A
Term
Ebstein's anomaly is associated with what drug?
Definition
lithium
Term
What is the associated heart defect? chromosome 22q11 (2 defects)
Definition
1. Tetralogy of Fallot
2. Truncus arteriosis
Term
What is the associated heart defect? Down's Syndrome
Definition
Endocardial cushion defects
Term
What is the associated heart defect? Congenital Rubella (2 defects)
Definition
1. PDA
2. Pulmonary Artery Stenosis
Term
What is the associated heart defect? Turner's Syndrome
Definition
Coarctation of the aorta
Term
What is the associated heart defect? Marfan's Syndrome
Definition
Aortic insufficiency
Term
What problems are the offspring of diabetic mothers at risk for?
Definition
1. Transposition of Great Vessels
2. hypOglycemia
3. Large for gestational age
Term
If a child is born with a cleft lip, what embryologic structures failed to fuse?
Definition
Maxillary and medial nasal processes
Term
If a child is born with a cleft palate, there was defective fusion of what structures?
Definition
Lateral palatine processes, nasal septums and/or the median palatine process
Term
From which brachial pouch is this structure derived? middle ear and eustachian tubes?
Definition
1st
Term
From which brachial pouch is this structure derived? superior parathyroids
Definition
4th
Term
From which brachial pouch is this structure derived? Inferior parathyroids
Definition
3rd
Term
From which brachial pouch is this structure derived? epithelial lining of the palatine tonsil
Definition
2nd
Term
From which brachial pouch is this structure derived? thymus
Definition
3rd and 4th pouch
Term
What CN is/are responsible for this tongue innervation? taste in the anterior 2/3
Definition
VII
Term
What CN is/are responsible for this tongue innervation? Taste in the posterior 1/3 (main innervator)
Definition
IX
Term
What CN is/are responsible for this tongue innervation? motor
Definition
XII
Term
What CN is/are responsible for this tongue innervation? sensation of the anterior 2/3
Definition
V3
Term
What CN is/are responsible for this tongue innervation? sensation in the posterior 1/3
Definition
IX
Term
What 3 conditions are associated with an Arnold-Chiari malformation?
Definition
1. hyrocephalis
2. myelomeningocele
3. syringomyelia
Term
What is the difference between an omphalocele and a gastroschisis? Which is worse?
Definition
Both are caused by defects in the abdominal wall with protruding viscera. An omphalocele is covered by a sac whereas a gastroschisis is NOT. An omphalocele is worse bc often the liver protrudes
Term
What is the difference b/w a brachial cleft cyst and a thyroglossal duct cyst?
Definition
Brachial cleft cysts are on the lateral neck, whereas thyroglossal duct cysts are midline and move when swallowing
Term
What are the classic presenting symptoms of syringomyelia?
Definition
"cape-like" bilateral loss of pain and temperature sensation in the upper extremities (w/ preservation of touch sensation)
Term
What posterior fossa malformation results in a large posterior fossa, absent cerebellar vermis, and cystic enlargement of the 4th ventricle?
Definition
Dandy-Walker malformation
Term
What cell layer do the brachial clefts come from?
Definition
ectoderm
Term
What cell layer do the brachial arches come from?
Definition
mesoderm
Term
What cell layer do the brachial pouches come from?
Definition
endoderm
Term
During what week do the abdominal contents return to the abdomen? What artery do they rotate around?
Definition
10th week; they rotate around the SMA
Term
How does congenital pyloric stenosis present?
Definition
Palpable "olive mass" in epigastric region; non-bilous projectile vomiting at 2 wks
Term
Potter's Syndrome results from malformation of what embryological structure?
Definition
ureteric bud
Term
The Horseshoe kidney gets trapped under what artery?
Definition
IMA
Term
What 4 structures arise from the mesonephric ducts?
Definition
"SEED" ...Seminal vesicles, Epididymus, Ejaculatory duct, Ductus deferens
Term
What is the female equivalent of the glans penis? From what structure is it derived?
Definition
Glans clitoris, derived f/ the genital tubercle
Term
What is the female equivalent to the male corpus cavernosum and spongiosum?
Definition
Vestibular bulbs, derived f/ the genital tubercle
Term
What is the female equivalent to the male bulbourethral glands (of Cowper)? From what are they derived?
Definition
Greater vestibular glands of Bartholin, derived w/ the urogenital sinus
Term
What is the female equivalent of the prostate gland? From what structure are they derived?
Definition
Urethral and periurethral gland of skene, derived f/ urogenital sinus
Term
What is the female equivalent to the ventral shaft of the penis? From what is it derived?
Definition
Labia minora, derived f/ the urogenital folds
Term
What is the female equivalent of the scrotum? What is it derived from?
Definition
Labia majora, derived f/ the labioscrotal swelling
Term
What other malformation is epispadias associated with?
Definition
Extropy of the bladder
Term
Dx? Male presents bc of infertility. Small testes, gynecomastia, tall w/ long extremities...
Definition
Klinefelter's (XXY)
Term
Dx? Female presents w/ primary amenorrhea. Short w/ shield chest and webbing of neck...
Definition
Turner's Sx (XO)
Term
What 2 cardiovascular anomalies are associated w/ Turner's Syndrome?
Definition
1. Bicuspid aortic valve
2. Coarctation of the aorta
Term
Pseudohermaphrodites are named according to what?
Definition
According to chromosome/gonads
Term
Dx? Ovaries are present, but external genitalia is virilized or ambiguus...
Definition
female pseudohermaphrodite
Term
Dx? Testes are present, but external genitalia are female or ambiguus
Definition
Male pseudohermaphroditism
Term
What is the most common cause of male pseudohermaphroditism?
Definition
Androgen Insensitivity Syndrome
Term
Dx? Normal appearing female, but testicular tissue found in labia majora...
Definition
Androgen Insensitivity Syndrome
Term
Dx? Ambiguous genitalia until puberty..."Penis at 12"...
Definition
5-alpha-reductase deficiency
Term
What reproductive pathology? Female w/ short stature and no barr body
Definition
Turner's Syndrome
Term
What reproductive pathology? Both ovarian and testicular tissues are present...
Definition
True hermaphroditism
Term
What reproductive pathology? Male w/ Barr body in PMN's...
Definition
Klinefelters
Term
What reproductive pathology? Ambiguus genitalia until puberty, then masculinization...
Definition
5-alpha-reductase deficiency
Term
What is the most common cause of early cyanosis?
Definition
Tetralogy of Fallot
Term
What is the most common cause of late cyanosis?
Definition
VSD resulting in Eisenmenger's
Term
What is the most common cause of primary amenorrhea?
Definition
Turner's Sx
Term
What is the most common cause of congenital malformation in the U.S.?
Definition
Fetal Alcohol Syndrome
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