Intrinsic Back Muscles

Question 1

Nuchal

Answer 1

Nape of the neck

Question 2

Splenius capitis and splenius cervicis make up

Answer 2

Superficial layer of the deep back

Question 3

Splenius capitis and splenius cervicis
Muscular action

Answer 3

Acting unilaterally laterally flexes the neck and rotates to side to the of active muscles
Acting bilaterally extend the neck and head

Question 4

attatchments of splenius capitis

Answer 4

PA nuchal ligament SP of C7-T6 vertebrae
DA mastoid process

Question 5

Attatchments of splenius cervicis

Answer 5

PA nuchal ligament SP of C7-T6
DA attatch to transverse C1-C4

Question 6

What is the intermediate layer of the deep back

Answer 6

Erector spinae group

Question 7

Action of the erector spinae group

Answer 7

Unilaterally laterally flex the vertebral column to the ipslateral side
Bilaterally extend the vertebral column

Question 8

What are the three names of the erectors? In order of medial to lateral

Answer 8

Spinalis
Longissimus
Illiocostalis

Question 9

What are the sub categories of illiocostalis ?

Answer 9

Illiocostalis lumborum
Illiocostalis thoracis
Illiocostalis cervicis

Question 10

What are the sub groups of longissimus

Answer 10

Longissimus thoracis
Longissimus capitis

Question 11

What are the sub group of spinalis

Answer 11

Spinalis thoracis
Spinalis cervicis

Question 12

Attatchments of the illiocostalis

Answer 12

PA Thoraco lumbarfascia
DA lower rib angles and cervical TP

Question 13

Attatchments of longissimus

Answer 13

PA thoraco lumbar fascia
DA mastoid process

Question 14

Spinalis attatchments

Answer 14

PA thoracolumbar fascia
DA Upper thoracic spinous process and cranium

Question 15

What’s the name of the deep group of the deep back

Answer 15

Transverospinalis group

Question 16

What are the names of the transverospinalis group ?
( in order of deep to superficial)

Answer 16

Rotatores
Multifidi
Semispinalis

Question 17

What is the muscle action of the rotatores

Answer 17

Unilaterally
Rotate the vertebral column to the contralateral side
Bilaterally
Extend the vertebral column locally

Question 18

Attatchments of the rotatores

Answer 18

Thoracic works best
Attatchments
TP of inferior vertebrae and SP of superior vertebrae
1 lvl brevis
2 lvl longus

Question 19

Muscle action of multifidi

Answer 19

Unilaterally
Rotate the vertebral column to the contra lateral side
Bilaterally extend the vertebral column
Stabilize the vertebrae during local movements of vertebral column

Question 20

Attatchments of the multifidi

Answer 20

Thickest in the lumbar
Inferior attachement
TP of T1-T3 and C4-C7
Psis
Mamillary process of lumbar vertebrae
2-4 vertebral lvl

Question 21

Semispinalis muscle activity

Answer 21

Extends the head neck and thoracic spine
Rotates them contralaterally

Question 22

What innervates the semispinalis

Answer 22

Cervical dorsal rami and spinal cervical nerves

Question 23

Attatchment of the semispinalis

Answer 23

IA TP of C4 to T12
SA Fibers run superomedially to occipital bone and SP in thoracic and
cervical regions
Spans 4-6 vertebral lvls

Question 24

What muscles make up the suboccipital triangle

Answer 24

Obliquus capitis superior
Obliquus capitis inferior
Rectus capitits posterior major

Question 25

The subboccipital group

Answer 25

Obliquus capitis superior Obliquus capitis inferior Rectus capitis posterior major Rectus capitis posterior minor

Question 26

Attatchments of capitis posterior major

Answer 26

PA spinous process of C2 DA lateral inferior nuchal line

Question 27

Attatchment of rectus capitis posterior minor

Answer 27

PA PT of C1 DA medial inferior nuchal line

Question 28

Obliquus capitis inferior attatchments

Answer 28

PA SP of C2 DA TP of C1

Question 29

Obliquus capitis superior attatchments

Answer 29

PA TP of C1 DA occipital bone between superior and inferior nuchal lines

Question 30

What nerve innervates the subboccipital triangle

Answer 30

Suboccipital nerve

Question 31

What is the roof of the suboccipital triangle

Answer 31

Semispinalis capitis

Question 32

What is the floor of the subboccipital triangle

Answer 32

Posterior antlanto-occipital membrane and posterior arch of vertebra C1

Question 33

Subboccipital nerve

Answer 33

Origin Posterior ramus of spinal nerve C1 Distributes To muscles of suboccipital muscles

Question 34

Greater occipital nerve

Answer 34

Posterior ramus of spinal nerve C2 Distributes Skin over the neck and occipital bone

Question 35

Lesser occipital nerve

Answer 35

Origin Anterior rami of spinal nerve C2-C3 Skin of posterolateral neck and scalp posterior to external ear

Question 36

Posterior rami

Answer 36

Origin C3-C7 Distribution Intrinsic muscles of back and overlaying skin (adjacent to vertebral column)