Ch. 12: Muscular and Articular Systems

Question 1

mvts of bones w/out reference to the jt or the forces producing that mvt

Answer 1

Osteokinematic mvt

Question 2

when the body moves over a fixed DIST segment

Answer 2

closed kinetic chain

Question 3

advantage and disadvantage of closed kinetic chain mvts

Answer 3

advantage: increased neuromuscular control and balance, promote dynamic stabilization (synergistic mms activate), generates stabilizing compressive forces through jts

Question 4

DIST segment moves in space generally against a resistance (resistance not required though)

Answer 4

open kinetic chain

Question 5

advantage and disadvantage of open kinetic chain mvts

Answer 5

Advantage: can target specific mms and identify strength deficits, allows for free mvt and rapid acceleration of DIST segment (good for specific sports training)
Disadvantage: may introduce shearing stress across jts, less neuromuscular control and balance

Question 6

mvt that occurs at the jt itself b/w the opposing jt surfaces

Answer 6

arthrokinematic motion

Question 7

3 aspects of arthrokinematic motion

Answer 7

roll, slide (or glide), and spin

Question 8

imaginary points on the moving surface contact points at the same intervals on the opposing surface (arthrokinematic motion)

Answer 8

roll

Question 9

imaginary points on the moving surface contact / glide over various points on the opposing surface

Answer 9

slide

Question 10

rotation of the moving surface on the opposing surface

Answer 10

spin

Question 11

which 2 aspects of arthrokinematics occur simultaneously

Answer 11

roll and slide

Question 12

concave - convex rule

Answer 12

if a concave surface moves over a stationary convex surface, sliding occurs in the same direction as mvt of the bony lever. If a convex surface moves over a stationary concave one, sliding occurs in the opposite
direction as movement of the bony lever