Elbow and radioulnar joint pt 1

functional anatomy

is the radius or ulan larger proximally

is the radius or ulna larger distally

radius - larger distally

ulna- larger proximally

the ulna and the radisu are distal attatchmnts for these muscles

• bicep brachii

• brachialis 

• triceps brachii

  

(forces transmitted in scapula and humerus produces flexion in elbow joint)

bony landmarks of the muscles

what is the trochlea and what does it do

articulates with trochlear notch of ulna to form humeral ulnar joint

medial distal end of humerus

humeral ulnar joint is a hinge for elbow flexion and extension

what is the capitulim and what does it do

on distal humerus

articulates with head of radius 

forms humeral radial joint> (supination, pronation, flexion, extension)

what does the capitulum articulate with and what joint does it make 

capitulum articulates with radius 

makes the humeroadial joint 

what does the trochlea articulate with and what joint does it make

trochlea articulates with ulna

makes the humeroulnar joint

what are the three joints of the elbow 

humeroulnar joint 

humeroradial joint 

proximal radioulnar joint 

humeroulnar joint actions and joint type

hinge movement 

flexion and extension 

humeroradial joint actions and joint type

ball and socket joint- acts like pivot joint

what is the proximal radioulnar joint, actions, and joint type

made up of radius and ulna

pivot joint

radial head rotates around proximal ulna

distal radius rotates around distal ulna

what do radius and ulna do during pronation and supination

what are the three ligaments of the elbow

ulnar/medial collateral ligament (MCL)

radial/ lateral collateral ligament (LCL)

annular ligament

what does the ulnar/medial collateral ligament do

prevents movement against valgus force

aka prevents elbow from abducting when stressed physically

gets injuerd more often»Tommy john procedure

what does the Radial/lateral collateral ligament do 

prevents against varus forces

rarely injured

what does the annular ligament do and where is it

encapsulates radial head

prevents dislocation of radial head

what happens when the elbow is flexed at 20 degrees or more

bony stability unlocked

more side to side laxity

stability in flexion involve mostly mcl and lcl

what is a carrying angle

slight outward angle of the forearm from the elbow when arm is fully extended and palm is facing forward.

natural angle arms can swing without hitting your hips while walking

girls havce greater carrying angle

what are the movements of the elbow joint 

flexion 

extension 

pronation 

supination