Embryology - structurespt1

bizma's version from 2017-05-20 01:51




Question Answer
Truncus arteriosusAscending aorta, pulm trunk
Bulbus cordisSmooth R and L ventricle
Primitive ventricleTrabeculated parts of R and L ventricle
Primitive atriaTrabeculated R and L atria
R horn of sinus venosusSmooth R atria
L horn of sinus venosusCoronary sinus
R common cardinal vein and R anterior cardinal veinSVC
Pulmonary veinsSmooth L atria


Sinus Venosus, A=40x43


Arterial system - Aortic Arches

Question Answer
1MAXillary a (ext carotid)
2-Stapedial a
-Hyoid a
3-R and L Common Carotids
-Proximal R and L Internal carotid
4-R - prox subclavian
-L - part of aortic arch
6-Proximal R and L pulmonary arteries
-L - ductus arteriosus

Random structures derivatives

Question Answer
SensoryAlar plate (dorsal)
Motor, autonomicsBasal plate (ventral)
Adeno-hypo-physisSurface ectoderm(AP)
Neuro-hypo-physisNeural ectoderm(PP)
Chromaffin, enterochromaffin, C cellsNeural crest(cells in the adrenal medulla)
Nucleaus pulposusNotocord
MediaN umbilical ligamentUrachus/allaNtois(Nice N Tight)
Falciform/ligamentum teresUmbilical vein(V=split)
ArchesMesoderm + Neural crest
Diaphragm (4)1)Septum transversum (central tendon)
2)Pleuro-peritoneal folds
3)Esophageal mesoderm
4)Body wall
Pancreas1)Ventral bud - head, uncinate(The head is the 1st ti LIVEr)
2)Dorsal bud - body, tail, etc

-Annular pancreas=Ventral pancreatic bud dividing and rotating around both the right and left sides of the 2nd part of the duodenum, thus encircling it.Projectile vomiting.
-NL(NL=WRap around Right)
The ventral pancreatic bud rotates clockwise around the duodenal endoderm and posterior to the SMA to form the uncinate process. The dorsal pancreatic bud gives rise to the head, body, and tail of the pancreas, all of which are anterior to the SMA.
Kidney(3 stages)1)(Pro)
2) Meso(later male genital system)
3)Metanephros= (bud,mesenchyme)=persists as the definitive adult kidney
Seminal vesicles, epidid, ejac duct, duct def(SEED)Mesonephric aka wolffian (+ androgens = MIF)
Fallopian, uterus, upper 1/3 of vaginaParamesonephric(mullerian) duct
Lower 2/3 vaginaUG sinus
level of kidneyT12-L3

defects and origin

Question Answer
Rathke's pouch (crystals, calcification)
-It gives rise to the anterior pituitary (adenohypophysis)(rAPhke)
-Vertebral defect
-Anal atresia
-Tracheo-esoph fistula
Urine from umbilicusPatent urachus
Outpouching of bladderVesicourachal diverticulum
Meconium from umbilicus
Vitelline fistula ex: Meckels (ectopic gastric mucosa)
NTDneuropore(four) not fuse (4th week)
Holoprosencephaly-Decrease Seperation of hemispheres across midline= cyclopia.
-A/w Patau's syndrom(extra chrom 13),. Fetal EtOH syndrome, and cleft lip/palate
-Cerebellar tonisillar herniation thru foramen magnum a/w aqueductal stenosis and hydrocephaly.
-Often presents w/ thoracolumbar myelomeningocele, and
syringomelia= enlargement of SC canal damaging STT.
Dandy-walker-No cerebellar vermis.
-Large 4th ventricle
Treacher collins
1st arch neural crest fail to migrate
Congenital pharyngo-cut fistulaArch 3. fistula in tonsillar area= lat neck
Persistent cervical sinusBranchial cleft cyst=Lateral neck
DiGeorge3, 4th pouches. Thymus and parathyroids(super.)
MEN 2ARET mutation in neural crest.
-Medullary Carcinoma(Parafollicular C cells=calcitonin)
Thyroglossal duct cystMidline(glossal) neck.
Cleft lipMaxillary and Medial nasal processes=Primary palate
Cleft palateLateral paletine process, nasal septum and/or medial palatine=Seconary palate
Renal obstructionUreto-pelvic jxn= last to canalize
Potter'sUreteric bud malform.=oligohydramnios
HypospadiasFailure of urethral folds
EpispadiasFailure of positioning of genital tubercle. a/w exstrophy of bladder
Gastros-chisisLateral body folds not close. abd contents out
Lateral body folds do not close=Persistant herniation of abd contents into umbilical (should return in 10th wk and rotate around SMA)
Olive mass in epigastric region, vomit at 2 wkCongenital pyloric stenosis. hypertorphy
PheoAlong path of crest cells migrating to adrenal medulla
Wilm's tumor-Embryonic nephrogenic tissue
-Chrom 11 deletion
Female pseudohermaphrodite46XX, CAH(enlarged clit)
Male pseudohermaphodite46XY, inadequate 5 -alpha-reductase(Testes present)
Testicular feminization-46XY. Androgen insensitivity syndrome

-Normal appearing female, female external genitalia with rudimentary(undevel.) vagina: uterus and uterine tubes generally absent: presents with no sexual hair: develops testes=labia majora
Hydrocele of testesOpen tunica vaginalis(tuna)