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Flashcards in Embryology TIPS from teacher Deck (15):

Blood vessles -> pituitary gland

- From the internal carotid artery:
> Superior hypophyseal arteries
> Inferior hypophyseal arteries
- Hypophyseal portal veins


Superior hypophyseal arteries

- Supplies: Pars tuberalis and the Infundibulum
- Form the primary capillary plexus, in the median eminence


Inferior hypophyseal arteries

- Supply: the posterior lobe (primarly) and a few branches goes to the anterior lobe


Hypophyseal portal veins

- Drains: the primarly capillary plexus of the median eminence, which delivers its blood into the secondary capillary plexus, located in the pars distalis


Secondary capillary plexus

The primarly capillary plexus of the median eminence delivers its blood into the secondary capillary plexus
- Location: the pars distalis


Functionalis vascularization

- Arcuate arteries(of the stratum vasculare) that supply the functionalis:
> Helical arteries:
~ Coiled arteries that supplies the galnds and the connective tissue
> Straight arteries
~ Shorter that the arcuate arteries
~ Supply ONLY the basalis


Stratum vasculare

Located in the middle layer of myometrium


Stratum vasculare

- Richly vascularized middle layer of the myometrium
- Houses the arcuate arteries


When is the embryonic period, period of organogenesis?

It is from the 3rd to 8th week


When is the fetal period?

9th week to birth


Endodermal germ layer

- Forms the epithelial lining of the primitive gut and the intraembryonic portions of the allantois and vitelline duct
- Epithelial lining of the respiratory tract
- The parenchyma of the thyroid, parathyroids, liver, and pancreas
- The reticular stroma of the tonsils and the thymus
- The epithelial lining of the urinary bladder and the urethra
- The epithelial lining of the tympanic cavity and auditory tube


What gives rise to all of the three germ layers (endoderm, ectoderm, mesoderm)



Ectodermal germ layer gives rise to:

- Sensory epithelium for ear nose and eye
- Epidermis including nails and hair
- Subcutanous glands
- Mammary gland
- Pituitary gland
- Enamel of teeth


Mesoderm gives rise to:

- Supporting tissues (Connective tissues, cartilages, and bone)
- Striated and smooth musculature
- Blood and lymph cells
- Walls of the heart, blood, and lymph vessles
- Kidneys, gonads, and their corresponing ducts
- Cortical portion of suprarenal gland
- Spleen


Somite formation

- Cells migrate more posteriorly through the node and cranialmost aspect of streak → paraxial mesoderm (somitomeres and somites)
- By the beginning of 3rd week, paraxial mesoderm is organized into segments, known as somitomeres, which first appear in cephalic region.