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The Anatomy of Puberty… from the Inside-Out
from Top-to-Bottomfrom Beginning-to-End
Everything you ever wanted to know about puberty…but were afraid to ask
December 2010 Richard E. Kreipe, MD, FAAPDivision of Adolescent MedicineGolisano Children’s HospitalUniversity of Rochester Medical Center
ACT for Youth Center of Excellence
Cornell University Family Life Development CenterCornell University Cooperative Extension of New York CityNew York State Center for School SafetyUniversity of Rochester Medical Center Div. of Adolescent Medicine
Text Copyright © 2010 by ACT for Youth Center of Excellence
Outline
Define terms related to puberty
Key internal and external changes in body
Common concerns and normal variants
Resources
Terms Related to Puberty
Gland: organ that produces hormones Hormones: chemical messengers that travel
in the bloodstream to affect other part(s) of the body
Hypothalamus: gland deep in brain that makes hormones to stimulate the pituitary
Pituitary: small gland below hypothalamus that makes hormones (FSH, LH) stimulating sex glands
www.typefreediabetes.com/v/vspfiles/templates/TypeFree/images/images_files/hypothalamus%20&%20pituitary.jpg
Terms Related to Puberty Gland: organ that produces hormones Hormones: chemical messengers that travel in the
bloodstream to affect other part(s) of the body Hypothalamus: gland deep in brain that makes
hormones to stimulate the pituitary Pituitary: small gland below hypothalamus that
makes hormones (FSH, LH) stimulating sex glands Sex glands (gonads)
Ovary: eggs; estrogen, progesterone Testicles (testes): sperm; testosterone
Reproductive organs Uterus (womb) →Vagina → Vulva (labia or lips) Penis and Scrotum (sac or bag)
www.health.com/health/static/hw/media/medical/hw/h9991281_001_1.jpg
www.health.com/health/library/mdp/0,,hw143376,00.html
http://www.netterimages.com/image/9033.htm Publication License NI0003842
Physical Changes of Puberty in Males
Physical Changes of Puberty in Females
Major Features of Puberty
Hormone changes
Sex organ changes (reproductive capacity)
Secondary sex characteristics
Organ changes (eg lymphoid; brain maturation)
Growth Spurt
Weight increase (Girls fat; Boys lean)
Between 10 and 14 years of age, the average girl’s weight increases from 72 to 112 pounds,
a total of 40 pounds!
Additional Features of Puberty
Sequence of events Females
Breast development Growth spurt Menses
Males Testicles enlarge Penis enlarges Growth spurt
Onset and Tempo (Velocity) Early developers grow more quickly in height than
late developers
Average Age for Pubertal Events
8-11 12 13 14 15 16 17 18
8.3 cm/yr 9.5 cm/yrPeak Height Velocity
Menses
Breast Black 9 yo; White 10 yo
8-11 12 13 14 15 16 17 18
Testes
Penis
2
3
Common Adolescent Concerns About Puberty
Onset Too early Too late
Height Too short Too tall
Acne, Body Odor Menstrual periods
Irregular periods normal Ovulation: Pregnancy possible
Nocturnal emissions “Wet Dreams” Ejaculation: Release of sperm
Resources Stages of Adolescent Development
http://www.actforyouth.net/documents/fACT%20Sheet05043.pdf
American Academy of Pediatrics—Healthy Children Website www.healthychildren.org/English/agesstages/gradeschool/puberty/Pages/default.aspx
Young Men’s Health.Org www.youngmenshealthsite.org/menu_genhealth.html#puberty
Young Women’s Health.Org
www.youngwomenshealth.org/genhealth_menu.html#puberty
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