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