all right now so hey everyone now I'd like to go over the bones of the arm alright we've kind of going over the bones the leg here's the bones of the arm and what I'm showing you here is I've drawn all of the anterior and posterior view of the right arm so this is going to be anterior and that's going to be posterior this is the right arm just like this is it cutting in this position right here so obviously up here you're gonna have the humerus then the forearm you're gonna have two bones you're gonna have the radius which is on the lateral side and the in the whole note which is on the medial side okay so let's talk about this humerus first so the humerus has got a couple of different parts the part that fits into the glenoid cavity of the scapula that's called a head and then the lift alright I we we got I've got to help her today come here good mr. Todd is helping me out today wave to the camera he's helping me out sit help me with the lectures so you've got this head of the humerus which fits in to the glenoid cavity of the scapula now there's a couple of bumps that you can see from this anterior view that serve as the attachment sites for different muscles these are called tuberosities you're gonna have excuse me they're called tubercles you're gonna have a greater tubercle and you're gonna have a lesser tubercle so the greater tubercle is going to be up here that's the one that's more kind of lateral and superior so greater tubercle he's gonna be located right here and then the lesser tubercle is gonna be a little bit lower so this is the lesser tubercle and he's gonna be located right here and when you look at the actual bone you can see these pretty well you got the head right here the greater tubercle is this bump right up here on the lateral side and you can see there the lesser tubercle is right there there's a little groove between the two tubercles which I've kind of drawn this little shaded line that's the intertubercular groove and tuber Bueller groove in this intertubercular groove what he does is he serves as a little passageway for the long tin or the tendon of the long head of the biceps muscle he slides the back room as the biceps kind of on the moves to elbow you're going to see also going to see on this lateral side there's a little bump about halfway down the humerus that's called the deltoid tuberosity because that's where the deltoid muscle attaches to the humerus so this is the deltoid tuberosity and he is located right about there now as we get down to more the distal end of the humerus you're gonna have a couple of different parts this little bony part on the medial side this forms that bony little bump on the medial side of your elbow that serves as the attachment side of like six different muscles of your forearm that's called the medial epicondyle so this is the medial at the end you're gonna have this hourglass shaped looking surface which articulates with the ulna that's called the trochlea so that's going to be called the trochlea TR o CH e which is gonna be located right there and then this laughable surface which articulates with the head of the radius that's gonna be called the capitulum c.a.p itu and he's gonna be located right there we were to switch this guy over to the posterior side you're gonna see some different features with many of the same still see the head of the humerus right there you can see the greater tubercle but you can't see the lesser tubercle so the greater tubercle is located right there the lesser tubercle is obviously on the anterior side so you can't see him now as we go down to the bottom we can definitely see the the medial epicondyle which is going to be right here the trochlea is going to be covered up by that the ulna right because that's the job of the truck we that troubling is the surface that the ulna kind of slides past and articulates with as the elbow moves the capitulum also can't be seen because the capitulum is more on the anterior side of the humerus so really the only two features that you can see on the posterior side on the distal end of the humerus is the medial epicondyle in the trochlea which is really kind of hidden by the ulna right so we'll kind of do a dotted arrow right there to show this behind the colon as we go down to the forearm if we go back to this anterior G let's talk about what we can see here this is gonna be obviously the ulna right here and then this is gonna be the radius on the lateral side the giveaway for who's who is it the radius is bigger at the distal end all in that is bigger at the proximal end or the radius is bigger at the wrist almost bigger at the elbow okay the radius has a couple of important parts the head of the radius is located right here so this is going to be called a head of the radius located right here in this little bump just just look to the head of the radius that's called the radial tuberosity so radial tuberosity and that's the attachment site for large muscles like the bicep okay now as we get down to the distal end of the radius this little bump that makes up the lateral side of the wrist right at the wrist that's called the styloid process of the radius he's gonna be located right there and what else we can kind of switch over to the ulna that ohm is a little bit more complicated right here we're kind of looking at this view of the ulna right this is the anterior view so you can see the only kind of wraps behind the distal end of the humerus if we were to turn the ulna and look at it from the lateral view you can really see the parts of the ulna a lot better and how those parts connect to the humerus so they were look kind of like this view of the ulna right here first off this bump in the back which makes up the elbow that's called the he's gonna be located right here now there's a lot about view of the ulna especially that the proximal end of the ulna looks like a rich thick really grabs onto the humerus this is called the Trop notch that's the inside of I guess the mouth of the ridge and that's this bottom part of the ridge that is called the coronoid process this little surface right here in the lateral side here the head of the of the ulna that that's where the head of the radius kind of sits right there that's called the radial notch so no and that's where the radius kind of sits in in that head of the owner really fits onto the distal end of the humerus I remember this is the lateral view McConnel a bowl the lateral view of that hole if we look at the posterior view of all these structures we see the ulnar right here which is right here what we're looking at is the electron on right so the olecranon would be here and then this would be the head of the radius the radial tuberosity is we go back down we will have the styloid process of the radius and also the styloid process of the ulna which is located right there all right one last thing I wanted to mention is that as the elbow kind of moves back and forth like for example when we extend the elbow this electrode on needs a place to go right as the arm or the elbows extended and you'll see there's a big depression right here that allows the electron to fit inside of the humerus that big depression is called the electron on fossa and that electron on fossa is located right here if we switch it over to the anterior side you're gonna have a depression right here where the right head of the radius sits when the elbow is flexed that's called the radial fossa and then another little depression right here on top of the chocolate that's where the coronoid process when the elbow is flexed that's called the coronoid fossa yet coronoid fossa radial fossa electron possible and that is it