Lunar months

Question 1

pre-embryonic stage

Answer 1

• fertilization to implantation

- approx. 2 weeks

Question 2

Embryonic period

Answer 2

15 days - 8 weeks

• organogenesis (wk 8)
• high risk malformations
• most vulnerable period (teratogens, prepare for pregnancy)

Question 3

Fetal period

Answer 3

• From 8-9 weeks to birth
• less vulnerable and external structure present
• from now on a process of maturing, refining, and perfecting

Question 4

How long is a lunar month?

Answer 4

28 days

Question 5

1st Lunar Month

Answer 5

• 1-4 weeks
• implantation
• germ layers develop
• heart prominent and begins to pulsate (2 chambered)
• arm and leg buds
• brain visible

Question 6

2nd Lunar Month

Answer 6

• 5-8 weeks
• Organogenesis complete by week 8.
• heart formed (fetal circulation established)
• face develops (and palate)
• limbs recognized
• largest organ: brain (growing very rapidly)

Question 7

3rd Lunar Month

Answer 7

• 9-12 weeks
• End of 1st trimester
• ossification of bones, eyelids now fused
• head 1/3-1/2
• begin to note sex by week 12 (gen. know at 16-18-20ish wks)
• FHT w/ doppler
• Kidney secrete urine by wk 9-10
• spontaneous movements are noted

Question 8

4th Lunar Month

Answer 8

• 13-16 weeks
• Lanugo on head, blood vessels visible , thin skin
• Quickening (active muscle movement) (usually mistaken for gas)
• 6-7 in.
• GI development (sucking motions, swallows am. fluid, mec. present, GI secretions)
• FHT with fetoscope

Question 9

5th Lunar Month

Answer 9

• 17-20 weeks
• Prominent lanugo
• brown fat deposits (skin less thin and transparent)
• Vernix Caseosa
• Nails
• Regular Habits (sleep, suck, kick) (when most report quickening)
• 10 in.

Question 10

6th Lunar month

Answer 10

• 21-24 weeks
• End of 2nd trimester (miscarriage or stillbirth)
• Fetal respiratory movements (take in am. fluid so crackles not abnorm.)
• substantial wt. gain
• increasing activity
• VIABILITY

Question 11

7th Lunar Month

Answer 11

• 25-28 weeks
• Surfactant production open alveoli after birth (crucial for lungs to inflate)
• Eyelids open
• Testes descend
• Resp. and circ. system sufficiently developed.

Question 12

8th Lunar Month

Answer 12

• 29-39 weeks
• SQ fat deposits
• Mineral storage in bones (Iron and Ca)
• Can be conditioned to respond to sounds outside mom’s body

Question 13

9th Lunar Month

Answer 13

• 33-36 weeks
• Increase in fat deposits
• body is rounded and plump (mom and baby)
• Lanugo disappears

Question 14

10th Lunar Month

Answer 14

• 37-40 weeks
• Considered full term (37 wks after conception)
• Fills uterus
• Acquires antibodies from mom

Question 15

Fetal nervous system

Answer 15

first to appear and last to mature

Question 16

Fetal respiratory system

Answer 16

Lungs are not fully developed until 8 years of life

Question 17

Fetal urinary system

Answer 17

secretion by week 9
urine present
maintain water and electrolyte balance

Question 18

Fetal GI system

Answer 18

• umbilical hernia until week 10 (abdomen too small to contain the intestines and some stored in umb. cord)
• bowels empty after birth

Question 19

Fetal Musculoskeletal system

Answer 19

continuous skeleton without joints at week 6