Tell about your leg.
5. Tell about your foot.
* * * * *
[Illustration: THE ELBOW JOINT.
(A hinge joint.)]
[Illustration: THE HIP JOINT.
(A ball-and-socket joint.)]
Some joints, as those of the skull, are immovable; some, as those of the
spine, may be moved a little; and others more or less freely, as those of
the limbs. In machines, the parts which move upon each other need to be
oiled, to keep them from wearing out; but the joints of our bodies oil
themselves with a thin fluid, called _synovia_. This fluid resembles the
white of an egg, and comes from a smooth lining inside of the joints. The
ends of the bones which form joints are covered by gristle or _cartilage_,
and are fastened together by very strong, silvery white bands, called
_ligaments_. A sprain is caused by overstretching or tearing some of these
ligaments.
* * * * *
QUESTIONS ON THE LIMBS AND JOINTS OF THE BODY.
What is the trunk of your body?--"All the body but the head and limbs."
Which are your limbs?--"My two arms and my two legs."
How many limbs have you?--"Four."
How many parts has your arm?--"Two parts: my upper arm and my fore-arm."
How many parts has your leg?--"Two parts: my thigh and my lower leg.
Pages:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25