Development Of M/F Systems Flashcards
Embryo
Placentation hasn’t taken place
Fetus
Development of placentation. Potential offspring in uterus
Embryo layers: Ectoderm
Nervous system
Skin
Hair
Layers of embryo: mesoderm
Muscle
Skeleton
CVS
Repro system
Layers of the embryo: endoderm
Digestive system
Lungs
Endocrine system
Pituitary gland neurohypophysis (posterior lobe) is made of…
Neural tissue. Axons and nerve terminals from hypothalamus
Formed from diverticulum of infundibulum (floor of brain)
Pituitary gland adenohypophysis (anterior lobe) formed from…
Stomodeal ectoderm. Tissue from roof of mouth
Formed from evagination of oral cavity: Rathke’s Pouch
Pituitary gland neurohypophysis (posterior lobe) hormones:
ADH
Oxytocin (from paraventricular nucleus/PVN)
Pituitary gland neurohypophysis (posterior lobe) hormones:
ADH
Oxytocin (from paraventricular nucleus/PVN)
Pituitary gland adenohypophysis (anterior lobe) hormones (6)…
FSH
LH
GH
Prolactin
ACTH
TSH
Chimera
Fusion of 2 different zygotes in a single embryo
Mosaic
Individual with 2 different cell lines that originated from the same individual
Differentiation of gonad
- Indifferent gonad has XX or XY. XY has SRY (sex determining region Y) gene and TDF (testis determining factor) which cause development of testes and testosterone production. XX does not have these genes. Ovaries develop. F is default sex
- Sertoli cells in testes make AMH (anti-mullarian hormone) which causes regression of paramesonephric duct. Leydig cells in testes use testosterone to make DHT (dihydrotestosterone) which cause development of penis, scrotum, and accessory sex glands
- Lack of male hormones cause mesonephric duct to regress and growth of uterus, oviducts, and cranial 1/3 of vagina
