- placental sinus
- placentation
- plagiocephaly
- pleuropericardial membrane
- pleuroperitoneal canal
- pleuroperitoneal foramen, Bochdalek foramen
- pleuroperitoneal membrane
- pleuroperitoneal opening
- pluripotent cell
- pneumatization
- polar trophoblast
- polarity
- polycystic kidney
- polydactyly
- polyspermy
- pontine flexure
- porencephaly
- positional information
- posterior cardinal vein
- posterior neuropore
- posterolateral fontanelle,mastoid fontanelle
- postformation theory, epigenesis theory
- postmature follicle
- postnatal development
- prechromaffin tissue
- predecidual cell
- preformation theory
- pregnancy reaction, gestation reaction
- pregnancy, gestation
- prenatal development,embryonic development
- preotic myotome
- pricardial coelom
- primary bronchus
- primary cerebral vesicle
- primary palate
- primary sex cord
- primary stem villus
- primary yolk sac
- primitive mesentery
- primitive body cavity
- primitive choana
- primitive cortex, fetal cortex
- primitive ectoderm
- primitive endoderm
- primitive ependymal layer
- primitive glottis
- primitive groove
- primitive gut
- primitive knot, primitive node
- primitive lesser sac