WEEK 2: Layer 6 Muscles of the Back

Question 1

Layer 5 Muscles

Answer 1

Iliocostalis
-Lumborum
-Thoracis
-Cervicis

Longissimus
-Thoracis
-Cervicis
-Capitis

Spinalis
-Thoracis
-Cervicis
-Capitis

Question 2

Layer 6 Muscles - Transversospinalis

Answer 2

Spinalis
3 Semispinalis - longest
2 Multifidus - middle
1 Rotatores - deepest

Originate from transverse processes
Insert on spinous processes

Question 3

Semispinalis - Origin, Insertion, Innervation, Action, Blood Supply

Answer 3

Origin
- Thoracis: TPs of T-spine
- Cervicis: TPs of T-spine and C-spine
- Capitis: TPs of C-spine

Insertion
- Thoracis: SPs of T-spine and C-spine
- Cervicis: Sis of C-spine
- Capitis: Occiput

Innervation
- dorsal rami of spinal nerves in the area

Action
- B/L = spinal extension
- U/L = contralateral rotation

Blood Supply

Question 4

Transversospinalis

Answer 4

Rot

Question 5

Layer 5 vs Layer 6 directional movement

Answer 5

Layer 5 ipsilateral
Layer 6 contralateral

Question 6

Multifidus meaning

Answer 6

MANY separate muscles in the back
-largest muscle sin the lower back

Question 7

Multifidus - Origin

Answer 7

Origin
-posterior sacrum
-PSIS
-inner surface of the erector spine
-mammillary process of each vertebrae

Insertion
-spinous process of the lumbar spine tracing up the thoracic spine

Innervation
- dorsal rami of spinal nerve in that area

Action
- extend the trunk at the spinal joint

Question 8

Rotatores - Longus & Brevis

Answer 8

Origin
- TP of all vertebrae

Insertion
Brevis: (root/lamina) SP of 1 segment above
Longus: (root/lamina) SP of 2 segment above

Question 9

Segment amounts for layer 5 muscles

Answer 9

3 Semispinalis - longest
2 Multifidus - middle
1 Rotatores - deepest

Question 10

Minor Deep Muscles

Answer 10

Intertransversalis (medial and lateral)
Interspinalis
Levator Costarum - Longus and Brevis