WEEK 3 - Growth.ppt

8/10/2019 WEEK 3 - Growth.ppt

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Growth


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Types of growth data

Longitudinal data.

the measurements are taken by the same

person for the entire period of growth.

Cross sectional data.

the measurements are taken by several

children in each age group at the time ofinvestigation.


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Growth curves

Distance curve:

In which, the measurement taken on an

individual at intervals is plotted against the

time, whether they are derived from the

whole body or from one of its parts.


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Distance curve


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Growth curves

Velocity curve:

In which, the increments of growth are

plotted against time I.e. this curve shows

the variations in the rate of growth against

time.


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Velocity curve


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Phases of growth

First phase:

In the early embryo, where every thing in

the embryo is a subject to growth and

there is a little differentiation of function.

Second phase:

Lasts until maturity, there is a kind ofbalance between growth and

differentiation of function.


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Phases of growth

Third phase:

In which, the main aim of the body isfunctional activity. The growth becomes in

the form of repairing of wounds and tears.Fourth phase:

Occurs in old age. The growth becomes

insufficient to keep the body wellbalanced. The cells are lost withoutreplacement.


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Patterns of growth

The size of the body or the size of any

system at different ages is plotted as

percentage of its size at the age of 20

years (representing maturity).

This leads to different patterns of growth


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Patterns of growth

The skeleton, respiratory, digestive

and execratory system.

they follow very similar curves and thus

the relative sizes remain more or less

constant during growth


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Patterns of growth

Lymphoid pattern:

The lymphoid structures (e.g. tonsils,

thymus & lymph nodes) grow rapidly in

young child and reach their maximum size

around the age of puberty, then they begin

to degenerate and by the age of 20 years

they are much less in amount than at theage of puberty


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Patterns of growth

Neural pattern

The central nervous system and the organs of

special sense grow rapidly in the early stages of

childhood where they reach about 90% of theiradult size at the age of 5 - 6 years.

At the age of 12 years they nearly reach the

adult size.Then the growth becomes much slower than the

rest of the body.


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Patterns of growth

Gonadal pattern

The gonads (testis & ovary) and the

external genitalia develop very slowly in

the early stages of childhood.

At puberty, they begin to grow much faster

than the rest of the body


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Patterns of growth

Uterine pattern

The uterus and the suprarenal glands are

relatively large at birth then, they loss their

weight rapidly and regain their birth weight

just before puberty.


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Patterns ofgrowth


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Patterns of

growth


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WEEK 3 - Growth.ppt