Embryology Flashcards
Derivatives if surface ectoderm
Anterior pituitary rathkes pouch Lens and cornea in eye Inner ear sensory organs Olfactory epithelium Salivary sweat mammary glands Nasal oral epithelium Epidermis
Neural tube derivatives
Brain and cord
Posterior pituitary and pineal gland
Retina
Neural crest cell derivatives
Adrenal medulla neural ganglia
Melanocytes
Skull bones schwann cells
Pia and arachnoid (not dura)
Bones and cartilage in branchial arches
Aorticopulmonary septum
Endocardial cushions
Mesodermal derivatives
Bones and cartilage except from branchial arches Connective tissue lymphatic system All muscles Cvs bvs spleen Kidney ureter Internal genitalia Adrenal cortex Serosal linings peritoneum
Endodermal derivatives
Gut Liver pancreas Lungs Thymus parathyroid Thyroid follicular cells and parafollicular C cels Middle ear epithelium Bladder urethra
Where is notochord derieved from
Mesoderm
Completely regresses
Remains as nucleus pulposus of IV disc.
What is base excision repair
Detection and removal of abnormal bases by GLYCOSYLASES
which creates empty sugar phosphate residue
Which is also removed and replaced by correct nucleotide
Failure of hindgut descent along IMA during embryogenesis
Imperforate anus which does not bleed
Primary oocyte is arrested in?
Prophase 1 ie prophase of first meiotic division ie diplotene
At puberty LH surges stimulates resumption of meiosis
Once menses starts occuring… meiosis 1 completes- a diploid cell becomes two haploid daughter cells
One becomes secondary oocyte and second becomes polar body
What type of oocyte enters meiosis 2
Secondary oocyte enters meiosis 2
Which gets arrested in metaphase untill fertilization
At fertilization meiosis 2 completes and second polar body is formed.
If in case first polar body also undergoes division there will be three polar bodies
B hcg at implantation on 7 day is secreted by
Syncytiotrophoblast
