Muscles of the Back : Deep Layer

Question 1

Name the muscles in each of the 3 layers of the deep layer of the back.

Answer 1

superficial : splenius capitis, splenius cervicis

Intermediate: Spinalis, Longissimus, iliocostalis

Deep: Semispinalis, Multifidus, Rotatores

Question 2

What 2 muscles are in the superficial layer of the deep layer of the back?

Answer 2

Splenius capitis, Splenius cervicis

Question 3

What are the attachments for Splenius Capitis and what are the avaliable actions?

Answer 3

Sp of C4-T2 to Mastoid process and lateral superior nuchal line

action: unilat contrac = ipsi rot
bilat contrac = ext of the neck

Question 4

What the attachments for the Splenius Cervicis and what are the avaliable actions?

Answer 4

SPs to T3-5 to C1-4 TVPs

actions: unilat contrac = ipsilat rot
Bilat contrac = ext of the neck

Question 5

what muscles make up the intermediate layer of the back muscles?

Answer 5

Spinalis longissimus, iliocostalis

Question 6

The spinalis sits in what spinal structure?

Answer 6

The laminar groove

Question 7

what are the 3 sections of the spinalis muscle?

Answer 7

thoracis
cervicis
capitis

Question 8

The spinalis muscle attaches along what spinal structures?

Answer 8

SPs

Question 9

The Longissimus attaches along what spinal structures?

Answer 9

TVPS

Question 10

what are the 3 sections of the longissimus called?

Answer 10

Thoracis
Cervicis
Capitis

Question 11

What spinal structure does the longissimus attaches to at each of it’s 3 sections?

Answer 11

Thoracis (TVPs of thoracic spine)
Cervicis ( TVPs of cervical spine)
Capitis (mastoid process)

Question 12

What are the 3 sections of the iliocostalis?

Answer 12

lumborum
thoracis
cervicis

Question 13

What spinal structure does the iliocostalis attach long?

Answer 13

Lumborum ( Angle of ribs 8-12)
Thoracis (angle of ribs 1-7)
Cervicis ( TVPs of C3-6)

Question 14

Collectively what are the actions avaliable to the erector spinae?

Answer 14

unilat = lat flex of the vertebral column
bilat = ext of the vertebral column

Question 15

What are the 3 muscles that make up the deep layer of the deep layer of the back?

Answer 15

Semispinalis
Multifidus
Rotatores

Question 16

The semispinalis attaches to the vertebrae of the spine but it skips how many vertebrae approx between attachements?

Answer 16

skips 3-6 vertebrae

Question 17

What are the 3 sections of the semispinalis called?

Answer 17

Thoracis
cervicis
capitis

Question 18

What are the actions avaliable to the Semispinalis?

Answer 18

bilat = ext of head and neck
unilat = contalat rot of the neck

Question 19

The Multifidus attaches from what portion of the spine to what portion and skips how many vertebrae at a time?

Answer 19

S4 - C2

skips 1-3 vertebrae

Question 20

What are the actions avaliable to the multifidus?

Answer 20

bilat = ext of the spine/ stabilization
unilat = lat flex , contralat rot

Question 21

which muscle in the deep layer of the deep layer of the back is the largest mass in the posterior neck? ( the one you can visibly see if someone exts there head)

Answer 21

Semispinalis

Question 22

in what spinal structure is the rotatores located in?

Answer 22

Deepest mm in the laminar groove

Question 23

what are the actions avaliable to the rotatores?

Answer 23

bilat = stabilization
unilat = contralateral rotation