Embryonic development — definition?
Process from fertilization to organ formation.
Embryonic period — focus?
Major organ systems are established.
Fertilization site — main location?
Ampullary region of the oviduct.
Zona pellucida — role?
Sperm interacts with it during fertilization.
Polyspermy block — purpose?
Prevents multiple sperm entry into oocyte.
First division — time after ovulation?
Approximately 24 hours.
Cleavage — process?
Cell division without growth.
Zygote — formation?
Fertilized egg with maternal and paternal pronuclei.
Morula — definition?
Solid ball of 16 blastomeres.
Gastrulation — key event?
Formation of bilaminar disc and primitive streak.
Notochord — derivative?
Nucleus pulposus of intervertebral discs.
Neurulation — outcome?
Neural tube formation.
Pharyngeal arches — number?
Initially six, fifth rudimentary, six fuses with four.
First pharyngeal cleft — develops into?
External auditory meatus.
Tongue development — origin?
Fusion of lingual septum and swellings.
Placenta formation — requires?
Synchronization of uterine receptivity and embryo stage.
Chorioallantoic placenta — type?
Formed by chorion and allantois contributions.
Placental barrier layers — define?
Maternal and fetal tissue strata separating blood.
Epitheliochorial placenta — barrier?
No maternal tissue loss, intact epithelium.
Synepitheliochorial placenta — feature?
Trophoblast fusion with endometrial epithelium.
Endotheliochorial placenta — characteristic?
Maternal epithelium and connective tissue lost.
Haemochorial placenta — barrier?
Maternal barrier is fully reduced.
Thoracic cavity — parts?
Pectoral and intrathoracic abdominal regions.
Pleura layers — define?
Parietal and visceral pleura.
Teste tes connaissances avec un QCM de 24 questions sur Embryology and Anatomy of Development.
1. Which sequence correctly describes the afferent visual pathway from the retina to the visual cortex?
2. Which nutrient source is provided by uterine gland secretion before full placental exchange is established?
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