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Full text of "Medical Jurisprudence And Toxicology"

28

MEDICAL JURISPRUDENCE

The neck of the femur forms almost a right angle with its shaft in the
female, and an obtuse angle in the male, while the head of the femur in the
male forms about two-thirds of a sphere, and is larger than that of the femur
in the female.

3.   AGE

The principal means which enable one to form a fairly accurate opinion
about the age of an individual, especially in earlier years, are teeth, height
and weight, ossification of bones and minor signs.

Teeth.—The estimation of age from the teeth with some amount of
certainty is only possible upto 22 to 25 years of age ; beyond that it is merely
guess work.

There are two sets of teeth, called temporary and permanent.

The temporary teeth are also called deciduous or milk teeth and are
twenty in number: four incisors, two canines, and four molars in each jaw.
They appear in infancy, are shed in the course of a few years and are re-
placed by the permanent teeth, which are thirty-two in number, consisting
of four incisorSj two canines, four premolars or bicuspids, and six molars
in each jaw.

The following table shows the average periods of eruption of the tempo-
rary and permanent teeth.

Teeth.
	Temporary.
	Permanent.

Central Incisors Lower Upper
	6th to 8th month. 8th to 10th month.
	7th to 8th year.

Lateral Incisors Lower Upper
	10th to 12th month. 7th to 9th month.
	8th to 9th year.

Canines
	17fch to 18th month.
	llth to 12th year.

Anterior Premolars or First Bicuspids
	Absent.
	9th to 10th year.

Posterior Premolars or Second Bicuspids
	Absent.
	10th to 12th year.

First Molars
	12th to 14th month.
	6th to 7th year.

Second Molars
	22nd to 24th month.
	12th to 14th year.11

Third Molars or Wisdom Teeth
	Absent.
	17th to 25tJi yea*,-^  -.

From investigations carried out in schools of boy& and girls in Madras
and Lahore, Shourie12 has prepared the following table showing the mean
ages at which the permanent teeth erupt:—

11.   In one ease I found that a boy, aged 15, had no second molar teeth.   Dr. Sahay of
Pataa reported to me that he examined two police recruits, aged 20 and 21 years res-
pectively.   Tite firs! of them had only twenty-three teeth.   He had not cut the right
tipper canine ^wtfe and the second molars.   The second had only twenty-four teetit
$$oaae of las seeoiast molars had eM^tecL   Botfc. of ^iem were weH built and had no
abnormality or <le$oiraity.

12.   fed. J<mr. HeA B0m<V0L XX£?» No, 1, 194^ p. 105.