beginning of the fetal period

Question 1

how long is gestation? how long is fetal period?

Answer 1

38 weeks or 40 weeks from last menstruation.

fetal period from nine weeks to end of gestation.

Question 2

what characterizes the fetal period?

Answer 2

maturation and growth of organ systems

Question 3

how does fetus grow during second trimester? third trimester?

Answer 3

2nd trimester, months 4-6, grows in length. third trimester, fetus primarily gains weight.

Question 4

how much does embryo weigh at eight weeks? how much does fetus weigh at 38 weeks?

Answer 4

8 grams vs. 3400g, or grows 425 times

Question 5

how do body proportions change during fetal period?

Answer 5

at nine weeks, fetus is approximately one half the crown rump length. bit birth the head is typically one fourth of the CRL.

Question 6

what do anterior and posterior mean in embryology?

Answer 6

in embryology, anterior means towards the head and posterior means towards the rump.

Question 7

why is head so much larger in early fetal development?

Answer 7

cells started developmental process earlier at anterior.