Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Ortho Exam 1 > Tissues of the MSK System 2 > Flashcards

Tissues of the MSK System 2 Flashcards

Ligaments, Muscles and Tendons

1
Q

fxn of ligs

A

limits joint motion

guide bones as they are moved by muscles or outside forces

stabilizes joint at either extreme of motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

where are ligs more lax

A

mid range of joint motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

ligaments are –> vascularized

A

poorly vascularized

heal poorly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what are ligs made of

A

dense, organized CT

lines of fibers line up with the lines of force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what provides tensile strength to ligs

A

collagen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what do ligs contain varying amounts of

A

elastin

to provide suppleness

determines the amount of movement allowed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

how are collagen fibers aligned –> ligs

A

parallel to the forces that the lig must resist

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

how do ligs attach

A

attachment to bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

how do ligaments attach to bone

A

collagen fibers –> fibrocartilage –> calcified cartilage –> bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

elastin content in a ligament is

A

variable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

elastin content in cruciate ligs of knee

A

almost all collagen

very little elastin

resists tensile load w/ minimal elongation

therefore –> excellent knee stabilizer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

elastin content of ligamentum flavum of spine

A

almost all elastin

very little collagen

can be stretched a lot before failure

poor ability to resist tensile loading

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

ligament failure is..

A

fxn of the load

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what do ligs resist better

A

slow load better than fast load before failure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

rapid loading –> ligs

A

intra-ligamentous lesion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

slow loading –> ligs

A

injuries at or near the bone-ligament interface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

ligament injuries are called

A

sprains

grades 1-3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

ligament innervation

A

highly innervated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

if there is very little pain after an injury –> ligs

A

injury may be more severe

if the ligament is torn –> there is less pain v. overstretch

less pain may equal more severe injury –> good diagnostic clue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

muscle fxn

A

muscles move body parts

stabilize a joint

20
Q

when muscles act as stabilizers…

A

reinforcing ligament fxn

21
Q

what are muscles composed of

A

contractile tissue

non-contractile tissue

22
Q

contractile tissue –> muscle

A

actin

myosin

sarcomeres

23
Q

non-contractile tissue –> muscle

A

fascia surrounding muscle

3 layers

24
Q

3 layers of fasica –> non-contractile tissue of muscle

A

endomysium

perimysium

epimysium

25
Q

endomysium –> muscle

A

surrounds individual muscle fiber

26
Q

perimysium –> muscle

A

surrounds groups of muscle fibers to form fascicles

27
Q

epimysium –> muscle

A

surrounds muscle fascicles (outermost membrane) to encase entire muscle

28
Q

what are forces generated by the muscle applied to

A

both contractile and non-contractile tissue

29
Q

tension developed by contraction –> muscles

A

either or active or passive

30
Q

active tension –> muscles

A

d/t contractile components

actin or myosin

31
Q

passive tension –> muscles

A

d/t elastic properties of the contractile tissues w/in the muscle

32
Q

how much can muscle fibers shorten

A

to about 50% of their original length

33
Q

force of contraction is dependent on –> muscles

A

length of fibers

velocity of contraction

direction that fiber is moving in at time of contraction

34
Q

how do muscles work

A

approximating insertion to origin

or

approximating origin to insertion

(usually works distal to proximal)

35
Q

what do tendons do

A

connect muscles to other structures

36
Q

tendons are compromised of

A

collagen

ground substance

cells

37
Q

how is the collagen in tendons oriented

A

in line w/ the muscle’s pull

38
Q

what do tendons do

A

transmit the force of muscle contraction to bone or other CT that they attach to

39
Q

how much force can a tendon withstand

A

at least 2x the maximum force that muscles can exert on them

40
Q

musculotendinous jxn

A

zone where muscle blends into tendinous tissue

41
Q

typically…–> musculotendinous unit

A

transitional zone is weaker than the body of the muscle/tendon

42
Q

what are some tendons surrounded by

A

tendon sheath or peritenon

43
Q

example of tendon sheath

A

achilles tendon and flexor tendons of hand

44
Q

what is a tendon sheath lined w/

A

synovial membrane

45
Q

what does the tendon sheath do

A

lubricates the tendon for easier gliding

guides the tendon towards the bony attachment

46
Q

failure in the muscle tendon unit may occur

A

in the muscle itself

in the musculotendinous jxn

in the tendon itself

at tendon-bone insertion

47
Q

where does failure in the muscle tendon unit mostly occur

A

transitional points

Ortho Exam 1 (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions