Moving joints (Skeleton and bones) by hamada1331


									Skeleton   and   bones

Moving joints
Joints are the places where
bones meet. Different kinds
of joints allow you to move
in different ways.

Hinge joint                                Fixed joints
Your knee can bend                         The bones that make up
in the middle but                          your skull start to join up
it can’t swing from                        soon after you are born.
                                           Once they have fused,
side to side. This                         none of them allow
joint has a hinge                          movement except the
like the one that                          hinged jaw joint.
allows you to
open and                             Knee joint

close a door.

   Have you ever used
 a joystick? That’s a ball
     and socket joint!

     Ball and socket
     Your hips are ball and socket joints.
     They allow you to move your legs in          There are 19 moveable joints in
     all directions and even to turn them.        your hand – not counting the ones
                                                  in your wrist!
                            What is tennis elbow?
                                                                                                   Moving joints
Bendy bits
Different sorts of joints                                         a terri
all over your body keep                                  ha nd is        f

you moving.                                       Y

                                                                                feat of eng
       Neck bones feature a                       g et i n o i t
       pivot joint that allows
       your head to turn.                             Tape your
                                                thumb to your first
       Wrists have a joint that                   finger. See how

                                                                                           in e
       allows them to turn but                difficult it is to open a
       not to go right round.                                                                  Thank your thumbs
                                               notebook, pick up a

                                                                                             Your thumb is the most

       Ankles contain different                    pen, and write
                                                     your name.                           flexible of your fingers.

       joints for up and down

       and side to side movement.                                                         You rely on your thumbs
                                                                                          whenever you handle
                                                 Hip hooray                               delicate objects.
                                                 Joints, particularly                                   This woman has
                                                knee and hip joints,                                      stretchy muscles and
                                                sometimes wear out in                                        ligaments that
                                                                                                                allow her spine
                                                old age. When this                                               to bend
                                               happens, doctors can                                              further than
                                                                                                                 most people
                                              remove the worn-out                                                can manage.
                                              joint and replace it
                                              with an artificial one.

     Bands of tissue called ligaments act
      like elastic. They hold your                                                                      Fabulously
         bones together yet                                                                             flexible
           still allow you                                                                              People whose
              to move.                                                                                  joints are
                                                                                                        flexible are
                                       Ligament                                                         called “double-
                                                                                               jointed”. The condition
                                                                                               can run in families, but
                                                                                               people who are double-
                       Your elbows                                        Bone
                       have a hinge
                                                                                               jointed must practise if
                       joint for bending                                                       they want to keep their
                       and a pivot joint so
                       they can turn.
                                                                                               ligaments stretchy.

                                   The name for sore elbow tendons caused by overuse.                                       23

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