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Flashcards in Spinal Musculature Deck (17)
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1

What are the layers of the back muscles?

Extrinsic superficial (1st) Trapezius and Latissimus DorsiExtrinsic intermediate (2nd) Levator Scapulae, RhomboidsSuperficial Intrinsic (3rd) Splenius capitis, Splenius cervicisIntermediate Intrinsic (4th) Erector spinaeDeep intrinsic (5th) Semispinalis capitis and cervicis, Rotatores costarum, Interspinales, Intertransversales, Multifidus

2

What are the erector spinae muscles from lateral to medial?

Iliocostalis, longissimuis, spinalis

3

What muscles is iliocostalis divided into?

Iliocostalis lumborum, thoracis, and cervicis

4

What muscles is longissimus and spinalis divided into?

Longissimus/Spinalis thoracis, cervicis, and capitis

5

Bogduk suggest categorizing lumbar and thoracic portion of iliocostalis and longissimus into?

longissimus thoracis pars lumborum and thoracisIlliocostalis lumborum pars lumborum and thoracis

6

In Bogduk's classification how do the muscles function differently in the lumbar region?

The line of action is on an oblique axis causing a shearing force in combination with an extensor movement of the superior vertebrae

7

In Bogduk's classification the thoracic portion of the muscles are unique how?

They are parallel to the axis of compression to allow for greater extension

8

How are the erector spinae muscles innervated?

By dorsal rami of segmental spinal nerves

9

What back muscles are most medial of the lumbar back muscles?

Multifidus

10

How do the multifidus originate and insert?

Laminae or mammillary processes to the spinous of vertebrae 2 or 3 levels over their origin

11

What range do the multifidus cover?

Sacrum-C2

12

What motions activate multifidus?

Extension, lateral bend, and contralateral rotation

13

What is significant about the innervation of multifidus?

Many mechanoreceptors for initiating and correcting motion

14

What are intertransversarii muscles divided into?

Medial and lateral components

15

Which group of intertransversarii are considered part of the "true back"?

Medial component (innervated by dorsal rami as opposed to lateral portion)

16

How are the interspinales muscles oriented?

On both sides of the interspinous ligaments

17

What is the main function of the multifidus, rotatores, interspinalis, and intertransversarii?

Mechanoreceptors and stabilization of the vertebrae during local movements