Chapter 6 Sacrum and Innominate Anatomy Flashcards Preview

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Flashcards in Chapter 6 Sacrum and Innominate Anatomy Deck (32):
1

When do the 3 bones of the innominate fuse?

20 years old

2

Anterior portion of 1st segment (S1)?

Sacral promontory

3

Sacral base?

Top (most cephalad) part

4

In somatic dysfunctions, what can be recorded as shallow (posterior) or deep (anterior)?

Sacral base or sacral sulci

5

How can you record the sacral ILA's?

Shallow (posterior), deep (anterior), superior or inferior

6

The SI joint is an inverted "L" joint with 2 arms converging anteriorly. Where do these arms join?

S2

7

2 types of pelvic ligaments/

True and accessory

8

True pelvic ligaments?

Anterior, posterior and interosseous SI ligaments

9

Accessory pelvic ligaments?

Sacrotuberous, sacrospinous, iliolumbar ligaments

10

What ligament divides the greater and lesser sciatic foramen?

Sacrospinous ligament

11

Which ligament is the 1st to become painful in lumbosacral decompensation?

Iliolumbar ligament

12

Types of pelvic muscles?

Primary and secondary

13

Primary pelvic muscles?

Make up pelvic diaphragm--levator ani, coccygeus

14

Secondary pelvic muscles?

Iliopsoas, obturator internus, piriformis

15

Origin/insertion of piriformis?

ILA, greater trochanter

16

Action of piriformis?

Ext rot, extend thigh, abducts thigh with hip flexed

17

Innervation of piriformis?

S1 and S2 nerve roots

18

What are S/S of sciatica due to hypertonic piriformis?

Pain from buttock radiating down thigh but not past knee

19

Axis upon innominates rotate?

Inferior transverse axis (S4)

20

4 types of sacral motion?

1) Dynamic motion
2) Respiratory motion
3) Inherent (craniosacral) motion
4) Postural motion

21

Location of transverse axis for resp and inherent motion of sacrum?

S2 (superior transverse axis)

22

Craniosacral flexion induces what sacral motion?

Counternutates (rotates posterior)

23

Craniosacral extension induces what sacral motion?

Nutation (rotates anterior)

24

Axis during dynamic sacral motion (walking)?

Oblique axes

25

Axis during postural motion?

Middle transverse axis (S3)

26

When L5 is SB, what sacral axis is engaged and where?

Oblique axis on the same side as side bending

27

When L5 is rotated, the sacrum rotates which way?

Opposite on an oblique axis

28

Where is the seated flexion test positive in sacral SD?

Opposite the oblique axis

29

B/l sacral flexion or extension move around what sacral axis?

Middle transverse

30

What is a common sacral dysfunction in the postpartum patient?

B/l sacral flexion

31

What axis does the sacrum rotate in a sacral margin posterior SD?

Mid-vertical or parasagittal

32

What is treated first, L5 or sacrum?

L5