Puberty - PowerPoint PPT Presentation

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Puberty

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Puberty Is the period which links the childhood and adulthood Female Pubertal Developments Period: 4-5 years (1.5-6 years) Female Pubertal Sequences: Growth ... – PowerPoint PPT presentation

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Title: Puberty


1
Puberty
  • Is the period which links the childhood and
    adulthood

2
Female Pubertal Developments
  • Period 4-5 years
  • (1.5-6 years)

3
Female Pubertal Sequences
  • Growth 9.8 years
  • Thelarche 10.0 years
  • Adrenarche 10.5 years
  • Menarche 12.8 years

4
Time of Puberty
  • Family
  • Sex
  • Nutrition
  • Obesity
  • Psychological
  • Genetic
  • General health
  • Geographical location
  • Exposure to the light

5
Physiology of the female puberty
  • Hormonal physical changes

6
I- During childhood
  • Low levels of hormones (gonadostat)
  • GnRH
  • FSHLH
  • Estrogen

7
Suppression of the Activity Levels of Hormones
  • Hypersensitivity of the Hypothalamus
  • Intrinsic CNS inhibition

8
II- During Adolescence
  • Increase levels of hormones
  • Adrenal androgen (Adrenarche)
  • Gonadotrophic hormones (FSHLH)
  • Estrogen (Gonadarche)

9
High Activity Levels of Hormones
  • Decrease sensitivity
  • Maturation of Hypothalamus
  • Increase amplitude frequency of pulsative GnRH

10
The Release of Pulsative GnRH
  • Increase Gonadotrophic steroids
  • Appearance of secondary sexual characteristics
  • Menarche
  • Ovulation (estradiol-LH)

11
Secondary Sexual Characteristics
  • Breast development
  • Pubic and axillary hair growth
  • Female fate distribution
  • Vaginal and uterine growth
  • Skeletal growth

12
Growth
  • Growth spurt, express as increase linear growth
    velocity in cm per year.

13
Growth
  • Peak 2 years after breast budding
  • Height reached maximum at age 17-18 years
  • Skeletal changes
  • Insulin-like
    GF
  • Growth
    hormone
  • Sex steroid

14
Thelarche
  • The earliest sign of of puberty to become evident
    is usually breast growth

15
Adrenarche
  • The growth of pubic and axillary hair is due to
    increase production of adrenal androgen

16
Adrenarche
  • Increase androgen 6-15 years
  • Is not under control of the following
  • Gonadotrophin
  • ACTH
  • Prolactin

17
Tanner Staging
  • The breasts and of pubic hair growth of puberty
    have been classified into five stages

18

19
Gonadarche
  • Factors which induce gonadarche in late
    pre-puberty
  • Anterior pituitary response GnRH
  • Follicle reactivity to FSHLH

20
The Age of Menarche is decline
  • Improve nutritional status
  • Body weight (47.8 kg)
  • Percentage of fat (16-23)
  • Obese girls (23-30)

21
In summary Puberty
  • Increase levels of gonadotrophinssteroids
  • Appearance of secondary sexual characteristics
  • Pulsatile GnRH (10-16 years)
  • Central negative inhibition
  • Maturation of positive feedback
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