Adolescence and puberty Flashcards
(82 cards)
What is meant by adolescence
• Adolescence – phase between childhood & adulthood • Pubertal development may be start of adolescence
What is meant by adulthood
• Adulthood: legally, culturally variable • UN: children < 18 years
What is the current age of adolescents and what is it expected to be soon
Current : 10-20
Future : 10-25
Summarise the cognitive/ emotional changes that take place during adolescence
Emotional change Reasoning - more abstract Greater knowledge / awareness of world Identity – of self, family, ethnicit
Summarise the changes in family relationships that take place during adolescence
Challenging rules Discipline needs reasoning Less confiding & intimacy in parents
Describe the changes in peer relationships that take place during adolescence
Peer activities / confiding Sexual relationships Peer group influences values and behaviour (pro / anti -social
Summarise the biological changes that take place during adolescence
• Puberty / Endocrine changes secondary sexual characteristics • Physical growth
What are the different developmental changes that occur during adolescence
§ Developmental stages of adolescence:
o Early 11-14.
o Middle 14-17.
o Late 18-21.
Describe adrenarche
• Starts: • Females: 6-9 years • Males: 7-10 years • Rise in adrenal 19- carbon steroid production, dehydroepiandrosterone (DHEA) and DHEA sulfate (DHEAS). • Manifests clinically as the appearance of axillary and pubic hair, usually about age 8. • Role uncertain -?Precursor to puberty
Soley dependent on adrenal androgens
Summarise the physical development that takes place during puberty
§ Physical development:
o Gender differences – girls grow taller, start puberty and are more mature, earlier than boys do.
o Pubertal changes – girls start puberty around 8 (with breast budding) whilst boys start around 10.5.
§ Peak for girls is 11-13.5, peak for boys is 13-15.
§ Early maturing girls and late maturing boys are at risk of – depression, substance abuse, ASBOs, eating disorders and bullying.
Define puberty
Puberty: growth due to synergy of gonadal steroids and growth hormone (APG)
What is growth due to in puberty
Is due to the GONADAL STEROIDS (particularly ANDROGENS) working in conjunction with other hormones, particularly
SOMATOTROPHIN (Growth Hormone) from the adenohypophysis
What are the two theories regarding the onset of puberty
§ Onset of puberty:
o Onset of puberty is due to two theories:
§ Maturation of the CNS affecting GnRH neurones (increased release).
§ Altered set-point to gonadal steroid negative feedback. - decreasing sensitivity of GnRH to gonadotrophins- leading to more gonadal secretions
o Not sure what triggers this but may be environmental.
Describe the changes in menarche in recent years
However there is evidence of a secular trend towards earlier puberty which suggests environmental factors :
improved health care
improved socio-economic factors (photoperiod? nutrition?)
§ Menarche – the first occurrence of menstruation.
o Has decreased over the last 150 years but seems to have been levelling off recently.
§ Possibly decreased due to nutritional reasons.
o Body weight at menarche has remained relatively constant at ~47kg over those years.
What is important to remember about adrenarche
§ Adrenarche – early sexual maturation stage (10 or 11) when DHEA DHEAS is made without cortisol.
Describe the key changes that take place during puberty
Females changes:
8+: growth of pubic hair and breast budding
10+: periods, growth, underarm hair and body shape change
12+: adult breast development
Male changes:
10+: growth of scrotum/testes and voice changes
11+: penis lengthening and growth of pubic hair
12+: growth spurt, change in body shape
13+: growth of facial hair
Differences: pubertal growth spurt earlier in females (11-13 years) than males (13-15 years)
Tanner stages of puberty
Describe the role of kisspeptin during puberty
Leptin may stimulate kisspeptin- which stimulates GnRH release
Leptin may also stimulate POMC and inhibit NPY/agRP release- further sitmulating GnRH release
o Kisspeptin stimulates GnRH and the GnRHR.
o Increased leptin can stimulate Kisspeptin and thus stimulate more GnRH.
§ Childhood obesity à early puberty
Summarise the role of the adrenal androgens during puberty
CRH - pituitary - ACTH- androtenedione and DHEA
Development of pubic hair, armpit hair and acne
Summarise the role of gonaotrophins during puberty
Gonads- sperm production and menarche
Male:
Development of:
Testes, penis and pubic hair
Females:
development of breast, ovaries and uterus.
Inhibin inhibits and activin stimulates the further development of pubic hair, armpit hair and acne.
What is the average age of menarche
Menarche: first period - starting from age 10, average 13
Year of menarche: has decreased from approx. 17 to age 13 - as a result of increased nutrition
Summarise the psychological changes that take place during puberty
Cognition e.g. morality • Identity • Increased self-awareness • Affect expression and regulation
More complex and philosophical thinking
Can see how others view them
Summarise the social changes that take place during puberty
• Family - parental surveillance, confiding • Peers • Increased importance • More complex & hierarchical • More sensitive to acceptance & rejection • Romantic relationships • Social role – education, occupation, etc
Changing relationship- increased risk of mental health disorders
Harder to navigate though more complex social interacitons- but may have got through with it during childhood- can no longer compensate.
Summarise the wider social influences during puberty
• School • Work • Culture (“teen” subculture; migration/culture) • Social influences eg unemployment, poverty/affluence, housing, neighbourhood effects
Outline the brain changes that take place during puberty
§ Grey matter decreases from 6yo à adolescence.
§ Linear increase in white matter until age 20
· ~12yo Frontal and parietal lobes develop peak.
· ~16yo Temporal lobes develop peak.
§ From puberty – increase in density of cortical white matter (more connections).
§ Pre-frontal cortex (executive function – i.e. planning) – increase in density of grey matter until puberty, then decrease.
· Dorso-lateral prefrontal cortex – last area to reach adult full density.
§ Synaptogenesis followed by pruning (synapse elimination) occurs.
§ Brain regions associated with more basic functions such as sensory and motor process mature first followed by association areas involved in top-down processing.