Embryology Flashcards
What is mitosis
Somatic cell division of a diploid cell
What is the point of mitosis
Replace dead and injured cells with the production of two identical cells
What is meiosis
Reproductive cell division of haploid cells
What is fertilisation
Fusion of male and female gametes
How long is sperm viable for
48 hrs
What is a fertilised ovum called
Zygote
What is a morula
Mass of 16-32 blastineres
What does the placenta provide
Gas, nutrients, waste products
What does the trophoblast differentiate into
Syncytiotrophoblast
Cytotrophoblast
Trilaminar embryonic discs for what three primary germ layers
Ectoderm
Mesoderm
Endoderm
What do ecotoderm cells do when the neural fold turns into the neural tube
Develop into the brain and spinal cord
Mesoderms develop into
Somites
Each Semite consists of
Myotome
Dermatome
Sclerotome
What does myotomes develop into
Skeletal muscles of the neck,trunk,limbs
Dermatomes form
Connective tissue, dermis of the skin
Sclerotomes form
Vertebrae and ribs
How many pharyngeal develop In the head and neck region
5 pairs
Pharyngeal is a developmental unit and gives rise to
Skeletal muscles, nerves and blood vessels
Blastocyst
Appearance of cavity between blastomeres
Timing of the embryo
From the 6th day after fertilisation to the end of the 8th week
Timing of the foetus
9th week to the end of development 40th week
Timing of the neonatal period
First 28 days after birth
Endoderm
Lining of the gastrointestinal tract,urinary bladder, gallbladder and liver
