Fetal Development

Gestation- period of time between conception to birth.

  • measure in weeks
  • 1-2 wks no yet pregnancy

1wk

  • first day of menses-not yet pregnant

2 wks

  • egg release from ovary- most likely to conceive(unprotected intercose )

2-3wks

  • 1.5-2mm length
  • heart and nervous system form
  • lung buds appear
  • heart is tubular and circulation start
  • nervous system- nervous plate develop into brain and spinal cord.

5wks

  • 0.4-0.5cm length,,,
  • 0.4gm wt
  • heart double chamber
  • limbs bud appear  

8wks

  • 3cm,,   2gm wt
  • every organ system present
  • eyelid start fuse.

12wks

  •   6-9cm,,wt 19gm
  • face..urine...sex
  • doppler hrt beat

16wk-

  • 11.5-13.5cm,,,
  • wt 100gm
  • ossification...movement...hair

20wk-

  • 16-18.5cm,,,
  • wt 300gm
  • featoscope....stethoscope
  • nail and muscles present

24wk-

  • 23cm
  • 600gm
  • hear
  • hand grasp
  • hair on head
  • vernix caseosa cover body

28wks

  • 31cm
  • 1100gm
  • eyelid open and close
  • lecithin form

32wks

  • 31cm
  • 1800-2100gm
  • bone fully develop
  • 1.2:1 lecithin and spingo.

36wks

  • 35cm
  • 2200-2900gm
  • skim pink round body
  • lungo hair disappear
  • 2:1 lecitin and spingomyelin

40 wk- 40-45cm
tests desecnded into scrotum.

(landmarks )female pelvis
1.sacral promontary
2.ala of sacram
3.sacroilliac joint
4.illeopectineal line
5.pectineal line
6.pectineal eminence
7.pubic tubrosity
8.pubic crest
9.pubic symphysis

Bones in female pelvis

  • 2 innominate bone/hip bone
  • sacram
  • coccyx

joints

  • 2 sacroilliac joint
  • 1 sacrococxygeal
  • 1 sympysis pubis

fetal skull
sutures

  • sagittal suture- btw 2 parital
  • coronal- btw frontal and 2 parital
  • frontal- btw 2 frontal
  • lamdoid-btw two parital and occipital bone

fontanalle space fomed by the connection of sutures

  • 6 fontanelle
  • ant.
  • post.
  • sagital
  • temporal
  • sphenoid
  • mastoid 

anterior

  • formed by the two frontal and two parietal bone
  • diamomd sahpe
  • also called bregma
  • dia >3cm
  • ossified 12-18m

post.

  • formed by 2parital and occipital bone
  • triangular shape
  • dia >2cm
  • ossified at 2 m

diameters of skull
9.5cm     so=◇ (comp flex.)   vertex     
                sm=◇(comp exten.)face
10cm      so= F  (incomp flex.) vertx
11.5cm  o=F (mark deflex) vertebral
                sm=V(incomp exten.)face
14cm      m=V(partial exten.) Brow

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