Lecture 9.2 Flashcards Preview

Anatomy: Human Locomotor Systems > Lecture 9.2 > Flashcards

Flashcards in Lecture 9.2 Deck (30):
1

What is more stable dorsiflexion or plantarflexion?

dorsiflexion

2

What kind of joint is the talocrural joint?

Hinge joint; oriented in a similar way to the ball and socket joint

3

What is the function of the inferior transverse ligament?

The inferior transverse ligament prevents posterior movement of the malleolar mortise.

4

What are the components of the medial collateral ligament of the foot?

4 parts:
posterior and anterior tibiotalar
Tibio calcaneal
tibionavicular

5

What is the function of the medial collateral ligament?

prevent too much eversion

6

Is the medial collateral ligament continuous or split?

continuous and blends with fibrous capsule of the joint

7

What shape are the collateral ligaments?

triangular

8

Why is the lateral collateral ligament so commonly sprained?

Because it is split into discrete parts

9

What are the parts of the lateral collateral ligament?

3 parts:
anterior and posterior talofibular
calcaneofibular

10

What muscles are involved in dorsiflexion?

Tibialis anterior
EHL
EDL

11

Why is dorsiflexion better for stability?

The talus is wider anteriorly meaning contact with the malleoli is stronger

12

What are the main intertarsal joints?

TaloCalcaneoNavicular joint (TCN)
Subtalar joint
calcaneocuboid

13

What kind of joint are the TCN and the subtalar joints?

modified ball and socket joints. with concave/convex facets on talus, calcaneus, and navicular

14

What is the sustentaculum tali?

The bit of the calcaneous that takes up the talus. It also provides the surface for interosseus ligament to attach to it.

15

What is the sinus tarsi?

The space between the calcaneus and the talus

16

What shape is the TCN joint mobility?
What motion does this joint allow?

oblique shaped allows inversion and eversion

17

What joint is the TCN a part of functionally (anterior and middle part)?

subtalar joint

18

What type of joint is the calcaneocuboid joint?

plane synovial joint. With TCN it functionally forms the midtarsal joint.

19

What movements does the calcaneocuboid joint allow?

pronation and supination

20

What kind of overall motion is pronation of the foot?

Eversion + lateral rotation

21

What kind of overall motion is supination of the foot?

Inversion + medial rotation

22

What kind of rotation causes flat feet?

pronation

23

What structures help maintain the lateral longitudinal arch?

Long and short plantar ligaments
fibularis longus tendon
plantar aponeurosis

24

Which bones form the lateral longitudinal arch?

Calcaneus
Talus
cuboid
Metatarsals 4 & 5

25

Which bones form the medial longitudinal arch?

Calcaneus
Talus (at the apex)
Navicular
Cuneiforms
Medial 3 metatarsals

26

What bones form the transverse longitudinal arch?

cuboid
cuneiforms
Base of metatarsals

27

What structures help maintain the medial longitudinal arch?

plantar aponeurosis
spring ligament
Tibialis Anterior and Posterior (tendons are attached to first metatarsal and medial cuneiform)
FHL

28

What happens to the ligaments that maintain the arch with age?

They become lax and as a result may cause pronated feet

29

What structures help maintain the transverse longitudinal arch?

fibularis longus
tibialis anterior 'sling'
tibialis posterior

30

What is the meaning of life?

Definitely not anatomy...