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Details

Embryo Endocrine
Dr Oberg 3/8/11
15
Medical
Professional
03/08/2011

Additional Medical Flashcards

 


 

Cards

Term

 

- Heart, lungs, kidney, GI tract, placenta

Definition

 

Organs with endocrine function

Term

 

- formed from cranial outpocketing of diencephalon

- integrates light-dark cycles (circadian rhythm)

- melatonin = active hormone

- "jet lag" response

- 8 wks body --> 4 months gland

Definition

 

Pineal Gland

Term

 

- 2 tissue origin (diencephalon/stomodeum)

- also called hypophysis

- secretes "releasing" hormones, oxytocin, ADH

Definition

 

Pituitary Gland

Term

 

- neurohypophysis = infundibulum

- ADH/oxytocin

- diencephalic origin

Definition

 

Posterior Pituitary

Term

 

- stomodeum origin from Rathke's pouch (4th week)

- remnants can transform into tumor (craniopharyngioma)

- Adenohypophysis

Definition

 

Anterior Pituitary

Term

 

- 2 tissues combine (proper + parafollicular)

- fetal function around 3 months (thyroxin) --> important for fetal growth and development (brain)

- deficiency leads to cretinism

Definition

 

Thyroid

Term

 

- mesodermal epithelium

- endodermal proliferation between tubercum impar and copula

- thyroglossal duct (midline descent)

- remnant surface structure = foramen cecum

Definition

 

Thyroid proper

Term

 

- migrate from pharyngeal pouch 4/5 (ultimobranchial body)

- release calcitonin (decrease blood calcium)

- works against PTH

Definition

 

Parafollicular cells (C cells)

Term

 

- origin of thymus and inferior parathyroid migration

Definition

 

3rd pharyngeal pouch

Term

 

- origin of superior parathyroid migration

Definition

 

4th pharyngeal pouch

Term

 

- originates at 4/5th pouch

- c-cells migrate into thyroid and reside around follicles

Definition

 

Ultimobranchial body

Term

 

- derived from mesoderm associated with septum transversum (not kidney)

- islands of cortical cells coalesce

- neural crest cells migrate in small clusters into center of gland thru cortex

- neuroblastoma can occur from neural crest clusters

Definition

 

Adrenal Gland

Term

 

- dorsal and ventral (left and right) buds form exocrine portion

- endocrine form from central glands (Ngn3) --> islet cells

- Wirsung and Santorini ducts fuse

- ventral bud rotates 270 degrees

Definition

 

Pancreas

Term

 

- hormones produced from stromal and epithelial derivatives

- Male - Leydig --> testosterone

- Female - thecal --> androstenedione, granulosa --(converts to)--> estrogens/progesterone

- Prostate converts T --> DHT

Definition

 

Gonads

Term

 

- yellow, large clear cells

- stain for Oil Red- O (Lipid)

Definition

 

Steroid hormone producing cells

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