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Embryo
USMLE step 1 Embryo
43
Medical
Graduate
10/29/2012

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Cards

Term
Which aortic arch develops into the Maxillary artery?
Definition
1st arch
Term
Which aortic arch develops into the stapedial artery and hyoid artery?
Definition
2nd arch
Term
Which aortic arch forms the carotid artery?
Definition
3rd arch
Term
Which aortic arch develops into the proximal part of the right subclavian artery?
Definition
4th arch
Term
Which aortic arch develops into the ductus arteriosus?
Definition
6th arch
Term
Which structures are associated with the first branchial arch?
Definition
Meckel's cartilage, mandible, malleus, incus, muscles of mastication, ant. belly of digastric, tensor tympani, tensor veli palatini.
Term
Which disease is associated with the first branchial arch?
Definition
Treacher Collins syndrome: presents as mandibular hypoplasia and facial abnormalities.
Term
Which structures are associated with the second branchial arch?
Definition
stapes, styloid process, stylohyoid, muscles of facial expression, posterior belly of the digastric.
Term
Which structures are associated with the third branchial arch?
Definition
stylopharyngeus
Term
Which structures are associated with the fourth-sixth branchial arches?
Definition
cartilages: thyroid, arytenoids, corniculate, cuneiform. 4th arch: cricothyroid, 6th arch: intrinsic muscles of the larynx.
Term
Which branchial cleft forms the external auditory meatus?
Definition
first cleft
Term
Which branchial pouch forms the middle ear cavity?
Definition
first
Term
Which branchial pouch forms the eustacian tube?
Definition
first
Term
Which branchial pouch forms the mastoid air cells?
Definition
first
Term
Which branchial pouch forms the epithelial lining of the palatine tonsil?
Definition
second
Term
Which branchial pouch forms the inferior parathyroid glands?
Definition
third
Term
Which branchial pouch forms the thymus?
Definition
third
Term
Which branchial pouch forms the superior parathyroid glands?
Definition
fourth
Term
Which syndrome results from aberrant development of the third and fourth pouches?
Definition
DiGeorge Syndrome: Tcell deficiency and hypocalcemia.
Term
Which branchial arch forms the anterior 2/3 of the tongue?
Definition
first
Term
Which branchial arches form the posterior 1/3 of the tongue?
Definition
third and fourth
Term
From what are the muscles of the tongue derived?
Definition
Occipital myotomes
Term
What are the symptoms of a thyroglossal duct cyst?
Definition
Midline cyst that moves with swallowing.
Term
What results from failure of fusion of the maxillary and medial nasal processes?
Definition
Cleft lip
Term
What results from failure of fusion of the lateral palatine processes, the nasal septum and/or the median palatine process?
Definition
cleft palate
Term
Failure of lateral fold closure causes...
Definition
omphalocele or gastroschisis
Term
Failure of caudal fold closure causes...
Definition
bladder extrophy
Term
Cause of jejunal, ileal, or colonic atresia?
Definition
vascular accident (apple peel atresia)
Term
What contributes of the pancreatic head and main pancreatic duct?
Definition
Ventral pancreatic buds
Term
What becomes the pancreatic body, tail, isthmus and accessory pancreatic duct?
Definition
Dorsal pancreatic buds
Term
Cause of annular pancreas
Definition
Ventral bud encircles second part of the duodenum.
Term
Cause of pancreas divisum?
Definition
failure of ventral and dorsal parts of the pancreas to fuse at 8 weeks.
Term
Origin of the spleen
Definition
Dorsal mesentery, mesoderm.
Term
What gives rises to the ureter, renal pelvis, and calyces?
Definition
ureteric bud
Term
Most common site of ureteric obstruction in fetus?
Definition
ureteropelvic junction
Term
Which artery does a horseshoe kidney get trapped under?
Definition
IMA
Term
With which disease is horseshoe kidney associated?
Definition
Turner's syndrome (45XO)
Term
What is the role of the SRY gene?
Definition
Produces testis determining factor--> Testes development.
Term
What is the role of Mullerian inhibitory factor (MIF) in male fetal development?
Definition
Inhibits paramesonephric duct development.
Term
What do the mesonephric ducts form?
Definition
Seminal vesicles, Ejaculatory duct, Epididymis, and ductus deferens
Term
What do Paramesonephric ducts form?
Definition
Uterus, fallopian tubes, upper vagina,
Term
What is the result of incomplete fusion of the paramesonephric ducts?
Definition
bicornuate uterus
Term
How will development proceed in an individual with 46XY genotype, but no sertoli cell development?
Definition
Individual will develop both male and female internal genitalia, but male external genitalia. (MIF is usually secreted by sertoli cells)
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