MDS FANATICS Embryology and Development & growth of teeth

What are 2 types of cell divisionsMitosis meiosis

What are Various steps in mitosis?

itChromosomes suspension seen in whichstageMetaphase

Chromosomes dysjunction seen at whichstageYes,anaphase.

MS-Meta suspensionAD-Ana dysjunction

Stages in meiosisProphase,metaphase,anaphase,telophase

What are stages in prophase?

In which stage cross over is seen?Pachytene

Synapsis is seen in which stage?Zygotene

How many chromosomes are there?Two

How many identical chromosomes infemales?A.23 pairs✓✓B.22pairsC.21pairsD.20 pairs

How many identical pairs of chromosomesseen in male?22 pairs.

What is embryo?First Two months developing individual iscalled embryo

What is a fetus?Yes it is after 2months to birth or 56 daystill birth

What is duration of intrauterine life?

What is difference in anaphase of mitosisand meiosis?No splitting of centromeres.

What are male gametesSpermatazoa.

What are parts of spermatozoa?•Head•Neck•Middle piece•Tail

What is special features of spermatozoacompared to normal cell?Motile

What is size of spermatozoa?60micrometrs

What is diameter of head?

Size of ova?120microns

Duration of spermatogenesis?64 days(2months or 60 days)

What is duration of labelledspermatogenesis?70 days

spermatozoa stored in?Epidydmis

What is enzyme stored in acrosome?Hyaluronidase

What is spermiogenesis?Spermatid becoming spermatozoon

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What is safe period to prevent pregnancy?

What is fertilization?Fusion of male and female gamet is calledfertilization

Where does fertilization takes place?Ampulla

What is morula?16 cell stage

When is morula formed?Yes it's by cleavage not by division ..but. Atwhat time how many daysBlastocysts form at how many days?

What is placenta?flattened circular organ in the uterus ofpregnant eutherian mammals, nourishingand maintaining the fetus through theumbilical cord.

What is length of placenta?

How many pharyngeal arches are seen?6 out of which 5th arch disappears.

What are pharyngeal arches?Rod like mesenchymal thickenings in wallof foregut

What are pharyngeal pouches?

•In between intervals of pharyngeal archesthe endoderm bulge outward called as•pharyngeal pouchesAlso known as endodermal pouches Which is organ developed from. All threelayers ...ectoderm endoderm mesoderm?Instead of tympanic go for EAR

Stapes is derived from?2nd pharyngeal arch

Which arch is also called Facial arch?2 nd arch is also called facial arch1st arch is called mandibular arch

2nd arch cartilage isReicherts

Arterial supply of 1st and 2nd arches•maxillary artery•stepedial artery

Arch of aorta supplies which arch?4th arch

How many somatomeres?7

How many somites?5

Occipital somites

What are barbodies?

What are Various stages of toothdevelopment?•Bud •Cap•Bell•Advanced bell

On what criteria are they classified?Based on enamel organ shape

Enamel organ is derived from?Neural crest cells

What is dental lamina?Horse shoe shaped structure whichprojects into underlying mesoderm

From where are permanent teethdeveloped?Distal extension of dental lamina

What does we call distal extension ofdentalamina?Lingual extension -successional laminaDistal extension - accessional lamina

Dental lamina is active up to - 5yrsAfter 5 years what happens to dentallamina?

Cell rests of serre

From which layer enamel is derived?Ectoderm.

First appearance of tooth formation occursin?6th week of I.U life

What are temporary structures in enamelorgan?•Enamel knot •enamel cord

What is function of enamel knot?Signalling centre for cusp formation

What is pulp of enamel organ?Stellate reticulum

Face is developed from how manyprimordia?7What is staphyloschisis?Cleft of soft palate

What is HERS.WHATS ITS SIGNIFICANCE?Hertwigs epithelial root sheath and itdecides no.of roots in a tooth

What is pax gene?Paired box gene - Which helps indetermining tooth germ position

Membrana performative seen in whichstage?Bell

Which is affected in deficiency of vit A?A.EnamelB.DentinC.CementumD.Bone Dentin>>enamel

What happens in vit A deficiency to tooth?Osteodentin or atypical dentin formation

Histological classification of stages oftooth development.??6 stages.

Can u name them?•Initiation •Proliferation•Histodifferentiation •Morphodifferentiation•Apposition•Maturation

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