The Lumbar Spine and Sacrum Flashcards Preview

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Flashcards in The Lumbar Spine and Sacrum Deck (56):
1

How many vertebrae are in the Lumbar spine?

5. L1 - L5 and are the largest and strongest in the body

2

What type of curve dose the lumbar spine create?

A lordotic curve

3

Are the 5 vertebrae similar in size?

Yep

4

What is at the base of each transverse process?

A small prominence of bone called the accessory or mamillary process

5

What is the junction of the lamina to the pedicle called in the lumbar spine?

The pars interarticularis

6

Where does the spinal cord end?

Between L1 and L2

7

How many vertebra does the sacrum consist of ?

5 vertebrae and they are fused

8

What type curve does the sacrum have?

Kyphotic=

9

What shape is the sacrum?

It is wedge shaped and forms the posterior walls of the pelvis

10

What does the sacrum articulate with?

The L5 above, the coccyx below, and laterally with the articular surfaces of the iliac bones of the hip

11

What is the sacro-iliac joint?

The joint between the pelvis and the sacram.

12

What is distal to S5?

A triangular bone, the coccyx, consisting of 3-5 fused vertebrae.

13

What are sacral foramina or pelvic foramina?

Foramina that lie at the lateral ends of the lines across the sacrum that represent the fused vertebrae

14

What is the area lateral to the sacral foramina known as?

The pars lateralis

15

What is the pars lateralis at S1 more commonly known as?

Ala

16

What is the projecting edge of the first sacral vertebra called?

The sacral promontory

17

What is the sacral promontory used for?

A landmark for sacral screw insertion

18

What does the total pelvis or pelvic girdle consist of?

Two hop bones (ossa coxae), the sacrum and the coccyx.

19

What does the ossa coxae articulate with?

The sacrum and the coccyx

20

What forms the ossa coxae?

the fused ilium, ischium and pubis

21

What type of joint is the sacro-iliac joint?

A true synovial joint, with capsule and cartilage

22

What are the two main ligaments in the lumbar spine?

the anterior and posterior longitudinal ligaments

23

What role do the ALL and PLL play?

A key role in the maintenance of spinal balance and protecting the discs

24

Describe the ALL.

Stretches as a long dense band from the basi occiput to the sacrum
Runs along the anterior aspect of the vertebral bodies
Long fibers that run full length
Short fibers that attach to the vertebra

25

Describe the PLL.

Stretches from the basi occiput to the sacral canal.
Does not attach to the posterior edge of the vertebral bodies.

26

Describe the segmental ligaments.

They join the vertebral arches adn the ligamentum flavum which is its thickest in the lumbar spine
Joins each lamina

27

What joins the spinous processes?

The interspinous ligamnet.

28

What attaches to the tips of the spinous processes?

The supraspinous ligament

29

What runs between the transverse processes?

The intertransverse ligament

30

Describe the lumbo-sacral ligament

Very thick and extends from the anterior-inferior aspect of the L5 transverse process to the lateral aspect of the sacrum.

31

What is the Lumbo-sacral ligament also known as?

The sickle ligament.

32

Where does the Iliolumbar ligament attach?

Extends from the transverse process of L5 laterally and superiorly to the iliac crest

33

What is considered a near immovable part of the pelvis and why?

The sacro-iliac joint because it is so tightly bound and interlocked with ligaments.

34

What shape is the articular surface of the iliac bone?

cresent shaped, concave postero-superiorly

35

What are the ligaments attached to the sacro-iliac joint?

The ilio-lumbar ligaments
sacro-iliac ligaments
sacrospinous ligaments
sacro-tuberous ligaments

36

What is the superficial plane of the lumbar muscles made of?

The latissimus dorsi which arises from the lumbar aponeurosis

37

What is the intermediate plane of the lumber muscles made of?

The serratus posterior inferior

38

Name the deep muscles of the lumbar spine.

Transversospinalis - Runs from L1 inferiorly and laterally to the transverse processes of the underlying 4 vertebrae

Interspinalis - on either side of the midline connecting adjoining spinous processes

Spinalis - Lies on either side of the interspinalis and posterior to the transversospinalis

Longissimus - lies lateral to the spinalis in the posterior wall of the thorax and inserts into the lower 10 ribs

Iliocstalis - a thick mass forming part of the wall of the thorax

39

What is the lumbar muscles vital role?

Maintaining an upright posture
Maintains the lumbar lordosis

40

What are the two main anterior lateral muscles in the lumbar spine?

Quadratus lumborum - runs between the last rib, the iliac crest and the vertebral column

Psoas - originates from the transverse process and posterolateral aspect of the vertebral bodies from T12 to L5, its fibres run inferiorly and laterally to blend with the fibres of the iliacus muscle.

41

What is the inferior region of the spinal cord?

Conus medullaris and usually lies between the T12 and L1.

42

Where is the termination of the spinal cord proper?

The conus medullaris

43

At the point of the conus medullaris the spinal cord becomes a tapering band of tissues called?

Filum terminale

44

What is the name of the spinal nerve roots that emerge from around the filum terminale?

The cauda equina

45

How many pairs of lumbar spinal nerves are there?

5 pairs of sacral and 1 pair of coccygeal

46

What is each nerve a combination of?

Motor and sensory fibres

47

Where does the L4 nerve root exit?

L4/5 lateral foramen near the L4 pedicle.

48

What are nerve fibers collected together called?

Rami

49

What are groups of rami called?

Plexuses

50

What types of plexuses are there in the lumbar spine?

Lumbar plexus
Sacral plexus

51

What comprises the lumbar plexus?

The ventral rami of L1-L4 nerves

52

What comprises the sacral plexus?

Fibres from the ventral rami of the nerves at L4, L5 and S1-S3.

53

What comes off of the abdominal aorta?

Lumbar arteries which run beneath the psoas muscle adherent to the vertebral bodies.

54

What comes off of the lumbar arteries?

Posterior and abdominal brances

55

What comes off of the posterior artery?

The spinal artery

56

Which level does the abdominal aorta bifurcate?

L4