elbow joint

Question 1

elbow joint classified

Answer 1

synovial, hinge, uniaxial

humoradial ( capitulum humerus and radial head )

humeroulna ( trochlea humerus, trochlea notch ulna )

Question 2

head of radius

Answer 2

articulate with capitulum of humerus

but when elbow is flexed the head will sit in the radial fossa on the humerus

Question 3

trochlea notch

Answer 3

articulates with the trochlea on the humerus but when the elbow is flexing the coronoid process will sit in the coronoid fossa

Question 4

olecrannon process

Answer 4

on ulnar sits in olecranon fossa in elbow extension

Question 5

relationship between the proximal radioulna joint and the elbow joint

Answer 5

share articulate capsule ( articular margin to humerus/ ulna) allows radius to move in pronation and supernation of forearm

synovial membrane- lines the inner surface of fibirous outlayer of capsule

extra synovial fat pads will occupy fossa on humerus when there are no bones occupying them

Question 6

proximal radioulna joint

Answer 6

synovial, pivot, uniaxial

head of radius, radial notch of the ulna

Question 7

annular ligament

Answer 7

ligament of the PRU JOINT

funnel shaped
margins of the radial notch of ulnar
encricles the head of the radius holding the head of the radius in the radical fossa allows supernaion and pronation to occur

prevents inferior radial dislocaion

Question 8

ulnar (medial) collateral ligament

Answer 8

3 bands
medial epicondyle humerus to coronoid process ulna

prevents abduction of forarm and radial deviation

Question 9

radial (lateral) collateral ligament

Answer 9

lateral epicondyle to blends with annular ligament

fan shaped prevents adduction/ ulna deviation

Question 10

middle radioulna joint

Answer 10

fibrous syndessmosus joint

interoseus membrane fibres run inferior from radius to ulna allows transmit force from radius to ulna then to elbow and so on

sit of muscle attach

acts as a fulcrum from pro and sup

Question 11

distal radioulna joint

Answer 11

synovial uniaxial pivot

head of ulna and ulna noch on radius

articulate disc from rim of notch to styloid proccess of ulna
main uniting structure sepreates distal and the wrist joint

Question 12

pro and distal radioulna joint permit

Answer 12

movement on one axis
radius will rotate around ulna for pro and sup

Question 13

how does radius move in supernation and pronation

Answer 13

pro joint- spin of radial head

1- translation- roll and slide of ulnar notch on ulna head= fulcrum through head of ulna

2- without translation- ulna moves out of way so radius can move
ulna- slight extension/ abduction in pronation
opposite in supernation