Embryology Flashcards
Morphogenesis
Development of form and structure
Differentiation
Specialisation for function
Cleavage
Splitting without growth
Forms the morula
Compaction
Forms the blastocyst
Trophoblasts line the cell and the embryoblasts cluster at the top
Oocyte
Egg cell
Zygote
fertilised oocyte
Zona pellucida
Glycoprotein cell that protects the zygote
Toti potent
Has the capacity to become any cell type
(before compaction)
Pluripotent
Has the capacity to become many cell types
(after compaction)
Bilaminar disk
The inner cell mass of embryoblasts differentiates into two layers (epiblasts and hypoblasts)
Ectopic Pregnancy
Implantation occurs at site other than uterine body e.g fallopian tube
Placenta Praevia
Implantation occurs in the lower uterine segment
Blastocoele
Cavity formed from compaction
Amniotic sac
Formed from spaces within the epiblast
Primitive yolk sac
Formed by hypoblasts lining the blastocoele
Secondary yolk sac
Pinches off from primitive yolk sac
Extraembryonic coelom
Chorionic cavity
formed from spaces within the extraembryonic reticulum and mesoderm
Ectoderm
Epiblast derivitive
Organs and structures that maintain contact with outside world e.g Nervous system
Mesoderm
Epiblast derivitive
Supporting tissues e.g MSK, vascular system
Endoderm
Internal structures e.g lining of GI, respiratory tract
Gastrulation
in 3rd week
trilaminar disk is formed by epiblast cells migrating and invaginating/differenciating intwo three layers
Notocord
Solid rod of cells running in the midline of the mesoderm
from where the primitive streak was
required to form the neurotube
Neural tube
formed from notocord forming a neural plate, and the edges curl and from the neurotube
Somite
a block of mesoderm
organises itself into dermomyotome and sclerotome
Gives rise to repeating structures and guids innervation
