week 2 sem 2

Question 1

elbow joint classification

Answer 1

synoival, uniaxial, hinge

made up of 2 articulations: humeroradial, humeroulnar

Question 2

elbow joint atricular surfaces

Answer 2

1. humeroradial
   - capitulum of humerus
   - head of radius
2. humeroulnar articulation
   - trochlear of the humerus
   - trochlear notch of the ulnar

Question 3

the proximal radioulnar joint classification

Answer 3

synovial, uniaxial, pivot

Question 4

the proximal radioulnar jointarticular surfaces

Answer 4

head of radius
radial notch of ulnar

Question 5

do the elbow and radioulnar joint share an articular capsule

Answer 5

yes
thickest and strongest on side

Question 6

do the elbow and radioulnar joint share an synovial membrane

Answer 6

yes

Question 7

what do ectra synoival fat pads

Answer 7

occupys fossa when bony projections are not sitting in them

Question 8

annular ligamnet- proximal radioulnar joint

Answer 8

ring shaped
attaches anterior and posterior margins of the radial notich of the ulnar & encirles the head of the radius to hold it in place

allows for pronation and supernation of the forerarm

funnel shaped which helps to prevent inferior disloacation of the radial head

Question 9

ulnar (medial) collateral ligament

Answer 9

from medial epicondyle of humerus to coronoid process and olecranon of ulna
made of 3 bands

PREVENT abduction of the forearm

Question 10

radial (lateral) collateral ligament

Answer 10

from lateral epicondyle of humerus to annular ligament
PREVENT adduction

Question 11

middle radioulnar joint classification

Answer 11

fibrous, syndesmosis
interrosesous membrane bw ulnar and radius
ribers run inferiorly from the radius to the ulna

Question 12

distal radioulnar joint classification

Answer 12

synovial, uniaxial, pivot

Question 13

distal radioulnar joint articular surface

Answer 13

head of ulna and ulna notch of radius

Question 14

functions of interousseous membrane

Answer 14

• transmitts forces from radius to ulna to humerus to perctoral girdal to axial of skeleton
• site of muscle attachment
• act as a piviot point for pronation and supernstion (rotation)

Question 15

articular disc of the radioulnar joint

Answer 15

from ulnar notch of the radius to styloid process of ulna
- main uniting structure, seperaes ulnar from the wrist joint

Question 16

pronation and supernation occurs how at the distal radio ulnar joint

Answer 16

1. WITH translation
   roll and slide of ulnar notch of radius on ulnar head
2. WITHOUT translation
   slight extension and abduction of ulnar

Question 17

muscle forces- rotary component

Answer 17

verticle component of muscle force- contributes to the bones movement at the joint

Question 18

muscle forces- transarticular component

Answer 18

hozozontal component of of muscle force therefore stabilising the joint

Question 19

spurt muscle

Answer 19

mover muscle
rotary> transcrticular
proximal attachment is further away and distal attachemnt is closer to the joint

Question 19

shunt muscle

Answer 19

stabilising muscle
rotary< transarticular
proximal attachment is closer to the joint and the distal attachment is further away from the joint

Question 20

rules for muscle recruitment

Answer 20

1. recruite a monokinetic muscle first
   momkenetic= one movment at one joint
2. recruite polykenetic muscles as need for force increase
   polykenetic= multiple movments, maybe multiple joints
3. recruite synergist as required
4. recruit shunt (stabiliser) muscles as speed and or load increase

Question 21

when supination occurs what happens at the proximal radio ulnar joint

Answer 21

the radius spins in annular ligament