SKELETAL SYSTEM ANATOMY: Bones of the arm- Humerus

here we are with the one bone found in

the arm which is in between your elbow

and your shoulder this is the humerus

ah-ha-ha-ha humerus you know and sounds

like that and so of course as we always

start off we are going to be asking

laterality what side of the body with

this particular bone be found on because

of course we have two of them well let's

use our markings to help determine that

as we take a look you'll notice one side

being a very very ball shaped structure

that is called the head and you can

imagine that this head is always

proximal and so that also helps us to

understand because it also faces

medially so you can imagine on the

lateral side it's not so much of a ball

but this big chunk of bone this big

chunk of bone is called the greater

tubercle like this big bump and then you

have the lesser tubercle here but this

head faces both proximal and medial so

now your would put your head here and

your feet way down there well of course

it would be like this or like this well

let's take a look at then what's

anterior because that would determine if

it's a right or left well one of the

nice things is this guy right here this

lesser tubercle you already got

introduced to the greater tubercle is

always on the anterior side so if you

see this you know that this is going to

be a right humerus the other way you

could tell is if you go distally and you

can find kind of couple divots or hole

kind of things that look like pits

we call those faucet shallow depression

or grooves one two of them here you can

see one called the radial of fossa and

the other one called the coronoid fossa

on the posterior side we get this big

gigantic huge one called the olecranon

fossa that's always on the posterior

side I always remember it because it's

the elbow the elbow goes back in and

elbows are in the posterior side so of

course I have to flip it this way and

then now with my right humerus let's

begin to take a look at all the rest of

the markings here so we got the head

with what we call the anatomical neck

you know an Tomica and animus always say

anything that binds the head to the rest

of the bone is considered a neck so if I

were to draw a line here you can see I

could break off the nice smooth little

head and that would be the neck the

anatomical neck but over and over people

grab ahold the bone and they are like oh

no there's a neck if I needed choke this

out this

we'll be the neck well that's not the

anatomical neck you know technically

speaking because it doesn't connect the

head so this would be considered the

surgical neck and people constantly use

then finally it took and voila surgical

neck it is so this is a surgical neck of

the head of the humerus this if I were

to grab it trying to choke this one up

this would be the anatomical neck so we

have the head anatomical neck we already

got introduced to the lesser tubercle

which is the bump on the anterior side

the greater tubercle on the lateral side

and then of course the surgical neck if

I were to grab this now if I were to

look through here do you see this big

notch here straight down this is a kind

of a groove as you notice you're not

going to really see it on any other side

because it's in between the greater

trochanter tubercle and the lesser

tubercle this is called the

intertubercular groove so this is the

intertubercular groove you'll find that

latissimus dorsi comes up and races into

there all right what else do we have

well on the lateral side of course on

the opposite side of the head is this

very rough an area this roughen area is

called the deltoid tuberosity I'm pretty

sure you guess what muscle goes there

all right continuing down you can see

the distal end has a few things sure we

should call this the lateral Conda and

the medial kind of but people like to

make up things besides just those kind

of not necessary boring names but

they're like ooh look this looks like a

person's head and this other one's like

ah yes and this one this one looks like

a spool like somebody has a spool of

thread and so they named them rather

than the lateral and medial condyles

they named them the capitulum which is

just like decapitating somebody so

somebody's cap Kappa Chilam is on the

lateral side that's this ball like

structure that articulates with the

radius and then this medium one that

looks like a spool and the spool term is

called trochlea so this is the trochlear

and this is the capitulum on each

lateral side of course then you get the

medial epicondyle and the lateral

epicondyle these work on Daoist above

the condyles are epicondyles this is

Nydia lateral epicondyle this is medial

epicondyle about the trochlea as I

mentioned before there's this little

divot that's called the coronoid fossa

on this other side there's a little

small divot above here that is the

radial fossa because

the radius will go there and then as we

take a look at the posterior side again

here's the olecranon fossa review head

anatomical neck with the greater

tubercle lesser tubercle with the

intertubercular groove racing between

then we got the surgical neck with the

deltoid tuberosity on the lateral side

with the distal end having the capitulum

just this ball trochlea here and then

the lateral and medial epicondyle with

the epicondyle Ridge those fancy words

and then this is the coronoid fossa and

this is the radial fossa and behind is

this big large electron ion fossa