How is a sesamoid bone defined
Long Bones, Short Bones, Flat Bones, Irregular Bones, Sesamoid Bones
the human skeletal system consists of
different types of bones in fact the
adult human skeletal system consists
typically of 206 different bones and all
these different types of bones can be
categorised into five groups and that
means the human skeletal system only
contains five different types of bones
so let's discuss what these five
different groups are what these five
different types of bones are let's
discuss their function and then let's
take a look at the following diagram and
let's place some of these bones into
their correct group so let's begin with
the the long bone the long bone is
called the long bone because their much
longer than they are wide and the long
bone consists of three different
sections we have our epiphysis the
metathesis and we have our diathesis
now the piphus is contains our spongy
bone also known as the cancellous bone
and this contains our red bone marrow
that synthesize red blood cells now the
metathesis consists of an important
section known as our epiphysial plate
and the and this epiphysial plate is
responsible for a lengthening and
elongating the long bone as the organism
as the human actually grows now our
diathesis is the long shaft the long
curved shaft that contains our compact
bone that basically is responsible for
giving our bone it's strongness so
basically our long bones are capable of
resisting very high tensile and
compressive forces and that's exactly
why these bones are responsible for
supporting our body in fact the long
bones support the majority of the body's
weight so we have many different types
of long bones in our bodies so let's
take a look at the following diagram so
we have the clavicle also known as the
collarbone so this bone here and this
bone here this is our example of a long
bone now in the arm we have the humor
is the bone here and we have the two
bones here our radius and the ulna these
are examples of long bonds now if we
examine our legs the legs also contain
long bones so we have the femur which is
the bone that is much stronger than
concrete we also have the tibia and a
fibula and these are also examples of
long bones now if we examine our fingers
the fingers specifically the metacarpals
are also examples of long bones but
these are much smaller than these long
bones so basically long bones can
actually be very long or they can be
very small so basically what the
defining what the definition of a long
bone is there much longer than they are
wider now let's take a look at the
second type of bone known as our short
bone so by definition a short bone has
the shape of a cube and that basically
means they are as long as they are wide
now they basically function by providing
support as well as the ability to other
bones and these short bones do not
actually move themselves now what are
some examples of short bones well if we
examine our wrist the wrist contains
bones known as the carpals and these are
examples of short bones now if we
examine the ankles of our body these
contain the tarsals which are also
examples of short bones now let's move
on to our flat bones so flat bones are
those bones that are relatively thin and
which contain a relatively high surface
area now these bones can serve two
important functions they can either
protect our internal organs and our
tissues and they can also serve as
attachment points for muscles because of
their high surface area so they contain
compact bone on the surface and in the
middle at the center they contain spongy
bone so what are some examples of flat
bones so the skull the crane
is an example of flat bones so we have
many of these flat bones that
essentially fused together as the
organism becomes an adult as the
organism grows and the skull these flat
bones basically serve the purpose of
protecting our brain our internal organ
now other examples of flat bones is the
ribcage as well as our sternum and this
acts not only as attachment points for
muscles but they also basically act to
protect the heart the lungs as well as
the vascular tissue found in this region
here now other examples of flat bones is
our scapula so this is the shoulder
blade bone this bone in this bone here
as well as the pelvis which is the bone
of the hip these are examples of flat
bone they have are on relatively large
surface area and they are relatively
flat relatively thin now let's move on
to our irregular bone so basically these
are the bones that have a certain unique
shape that we cannot actually label as
long bones short bones or flat bones so
these bones have unique shapes that help
them carry out certain types of unique
functions so typically our irregular
bones consist of bold compact as well as
spongy bone so we have spongy bone at
the center and compact bone usually on
the surface and they function in
protection as well as in support so one
example of our irregular bone is our
maxilla or our maxilla as well as the
mandible so these two bones have an
irregular shape the maxilla is the upper
jawbone the mandal of the mandible is
our lower jawbone and these function to
basically allow us to eat and ingest our
food that we need to actually survive
now another example of an irregular bone
is basically our sacrum so this is this
bone here a third example are the word
breeding so we have the cervical and the
lumbar vertebrae and these are basically
responsible in protecting our spinal
cord so these vertebrae basically
surround and protect our spinal cord so
the regular bones are bones that have
unique shapes that do not fit these
categories and these shapes help them
serve their specific purpose so they
have compact bone and spongy bone and
function protection and support some
examples include our sacrum the mandible
the maxilla and our vertebrae now the
final type of bone we're going to
examine is a sesamoid bone so all humans
typically contain one sesamoid bone and
that's basically our patella
now the patella or by definition our
sesamoid bone is a bone that is in the
shape of a sesame-seed and these
sesamoid bones or sesamoid bone
basically grows on our tendon so
basically the patella is found on the
tendon found in this region now as the
as the organism grows as the person
grows we can basically grow other types
of bones that are sesamoid bones and
these bones develop usually as a result
of some type of consistent physical
stress or physical frictions
