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Flashcards in Spinal Lecture 1 Deck (66)
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1

What is the shape of the sacrum and which direction does the base go?

Large triangle shaped bone with the base directed upward.

2

What is the sacrum wedged between?

The innominate bones on each side.

3

The sacrum is formed by the fusion of _ sacral vertebrae after aproximately __ years of age.

5 sacral vertebrae after approx. 20 years of age

4

What does the base of the sacrum articulate with?

5th lumbar vertebrae

5

What does the apex of the sacrum articulate with?

Coccyx

6

What does the sacral canal contain?

Cauda equina and spinal meninges

7

Describe the pelvic surface of the sacrum and the direction it faces.

Smooth concave surface facing anteriorly and inferiorly

8

How many pairs of pelvic sacral foramen are present and what is their purpose?

4 pairs which serve as passage for nerves

9

How many raised lines does the pelvic surface of the sacrum have? Which direction do they run?

4 raised transverse lines

10

Describe the dorsal surface of the sacrum

Roughened convex shaped surface

11

What type of facets are present on the dorsal surface of the sacrum? What do they articulate with?

Superior articular facets which articulate with the inferior articular facets of the 5th lumbar vertebrae.

12

How many pairs of dorsal sacral foramen are present and what is their purpose?

4 pairs which serve as passage for nerves

13

Median sacral crest is a midline ridge comprised of fused ____

Spinous processes

14

2 intermediate sacral crests on the ___ side of the dorsal foramen formed by the fused ___ and ___ processes.

2 intermediate sacral crests on the MEDIAL side of the dorsal foramen formed by the fused SUPERIOR and INFERIOR articular processes.

15

2 lateral sacral crests on the ____ side of the dorsal foramen formed by the fused ___ processes.

2 lateral sacral crests on the LATERAL side of the dorsal foramen formed by the fused TRANSVERSE processes.

16

What does the articular surface of the sacrum articulate with?

The ilium

17

What does the rough and pitted area on the lateral surface of the sacrum provide attachment for?

The sacroiliac ligament

18

What is the shape of the coccyx and what direction does it point?

Triangular in shape, directed inferiorly.

19

How many vertebrae does the coccyx consist of? What type

4 vestigial, rudimentary, undeveloped vertebrae

20

Describe the dorsal and pelvic surface of the coccyx.

Dorsal surface is roughened, pelvis surface is smooth.

21

What 3 components compose the innominate bone?

Ilium, ischium and pubis

22

What fraction of the hip bone is comprised of the ilium?

2/3

23

What fraction of the acetabulum is comprised from the ilium?

2/5

24

what direction does the gluteal surface point?

posterior and lateral

25

what is the gluteal surface inferior and superior to?

inferior to iliac crest, superior to acetabulum

26

How many ridges does the glutel surface have?

What are there directions?

3 - posterior, anterior, inferior

27

Which is the shortest most pronounced gluteal line?

posterior gluteal line

28

what two points does the posterior gluteal line run between?

iliac crest 4cm anterior to the PSIS running downward to the PIIS

29

what is the longest, arc shaped gluteal line?

anterior gluteal line

30

what two points does the anterior gluteal line run between?

tubercle of the crest 5cm posterior to ASIS to the middle of the upper margin of the greater sciatic notch