Lab 5: Musculoskeletal Flashcards Preview

Medsci142 Term 2 > Lab 5: Musculoskeletal > Flashcards

Flashcards in Lab 5: Musculoskeletal Deck (43):
1

What is flexion?

Decreasing a joint angle

2

What is extension?

Increasing a joint angle

3

What is origin?

A muscles attachment to bone that moves the least

4

What is insertion?

A muscles attachment to bone which moves the most

5

Differences between human and chicken legs?

Human has the tibia and the fibula, while chickens have a fused "shank"- the tibiotarsus (tibia and tarsals) and the fibula is a partially fused bone along side

6

What's in a myotendinous junction slide?

Ilifibular muscle to iliofibular tendon

7

What's in an osteotendinous junction slide?

Iliofibular tendon to fibula

8

What does a tendon resist in how many directions?

Tension in one direction

9

What is a tendon blood supply like?

Sparce

10

Function of osteoclasts?

Bone resorption

11

How do sharpey fibres become embedded in the bone matrix?

As bone grows, osteoblasts secrete hydroxyapocyte and trap collage fibres

12

Shape of skeletal muscle fibres in cross section?

Polyhedral

13

What surrounds every muscle fibre?

Endomysium

14

What surrounds every fasicle (bundle of muscle fibres)?

Perimysium

15

What surrounds muscle?

Epimysium

16

What happens to coarse collagen fibres of the tendon as they approach muscle?

Become finer and less regular

17

How is tensile force of the muscle transferred to the tendon?

When myocyte contracts, it pulls in the collagen

18

When can muscle affect a joint?

Only if it crosses the joint

19

What movement does contraction of the iliofibular muscle have on the chicken hip joint?

Extension

20

Contraction of biceps femoris long head affects hip joint?

Yes extension

21

Contraction of biceps femoris short head affects hip joint?

No

22

What is the function of the fibrous sling through which the tendon of the iliofibular muscle passes in the chicken?

Stops iliofibular muscle from bow-stringing

23

Why is there no corresponding sling in the human?

Because there's a short head of the biceps femoris

24

Name of a muscle that aids the action of another muscle?

Synergist

25

Name of muscle that opposes the action of another muscle?

Antagonist

26

What does a large amplitude movement have?

Little power (attached more proximally)

27

How much of it's original length can muscle contract?

1/3

28

Steps of the gait cycle?

Right heel strike
Right foot flat
Right mid-stance
Right push off
Right toe off
Right mid-swing
Right heel strike

29

When in the gait cycle is hamstring most active?

Right heel strike

30

When in the gait cycle is the hamstring somewhat active?

Right foot flat

31

Origin of the lateral iliotbial muscle?

Ilium

32

Insertion of the lateral iliotibial muscle?

Tibiotarus

33

Human equivalent of the lateral iliotibial muscle?

Gluteus maximum

34

Origin of the iliofibular muscle?

Ilium

35

Insertion of the iliofibular muscle?

Fibula

36

Human equivalent of the iliofibular muscle?

Biceps femoris (long head) and the sling is equivalent to the short head

37

Origin of the lateral and medial knew flexors?

Isctium

38

Insertion of the lateral and medial knee flexors?

Tibiotarus

39

Human equivalent of the lateral and medial knee flexors?

Semimembranous
Semi-tendinosus

40

What make up the hamstring muscle in the chicken?

Iliofibular muscle
Lateral and medial knee flexors (accessory muscle)

41

On the the medial view, what's the top and bottom flexors visible?

Top is medial, bottom is lateral

42

What does the aponeurosis attach to?

Medial knee flexor
Tibiotarus

43

What is are two parts of the aponeurosis in a chicken equivalent to?

The calcaneal/Achilles tendon