Intrinsic Back Muscles

Question 1

Splenius Capitis O, I, A (bi, uni), IN

Answer 1

O- Lower part of nuchal lig, Sps C7-T3
I- Mastoid process, lateral 1/3 of sup nuchal line
A-
bi- extend head and neck
uni- laterally flexes head + neck and ipsilateral rot of head
IN- lat branches of PPR C3-5

Question 2

Splenius cervicis O, I, A (bi, uni), IN

Answer 2

O- SPs of t4-6
I- Posterior tubercles of TPS c1-4
A:
bi- extend head + neck
uni- lat flex head + neck and ipsilateral rot of head
IN- lat branches of PPR C5-7

Question 3

3 parts of Iiliocostals O, I

Answer 3

lumborum
O- Common origin of erector spinae
I- Costal angles of lower 6-9 ribs

Thoracis
O- Costal angles of lower 6 ribs
I- Costal angles of upper 6 ribs

Cervicis
O- costal angles of 3-6 ribs
I- Post tubercles of TPs c4-7

Question 4

Iliocostals A (bi, uni), IN

Answer 4

bi- Extends the spine, rib depressor
uni- lat flex of spine

IN- lat branches of PP branches of nearby spinal nerves

Question 5

Longissimus 3 parts O, IN

Answer 5

Thoracis
O- common origin of erector spinae
I- TPs of lower 9 T vertebrea and shfts of lower 9 ribs

Cervicis
O- TPs of t1-5
I-Post tubercles of TPs and non articular part of Inferior APs of c2-6

Capitis
O- Tps of t1-5 and non articular part of APs C4-7
I- Mastoid process

Question 6

Longissimus A(bi and uni) IN

Answer 6

bi- extends spine
uni- lat flexes spine

In- Med and Lat branches of PP branches of nearby spinal nerves

Question 7

Spinalis 2 parts O, I (thoracis, cervicis)

Answer 7

thoracis
O- Sps of lower T and upper L vert
I- SPS of upper T vert

Cervicis
O- SPS of uppr t
I- Post tubercles of TPs and non articular art of inf AP of c2-6

Question 8

Spinalis A (bi, uni) IN

Answer 8

A-
uni- extends spine
bi- lat flexes spine

IN- Med brances of PP branches of nearby spinal nerves

Question 9

Rotatores brevis- O, I

Answer 9

O- TP of thoracic vertebrea

I- SP of vert above

Question 10

Rotatores longis- O, I

Answer 10

O- TVP of thoracic vert

I- TVP of 2nd vert above

Question 11

Rotatores A

Answer 11

contralateral rot of the trunk

Lotta sensory input

Question 12

Multifidus O, I A

Answer 12

O- TVP same as the rotatores

I- 3/4 Sps above (oblique direction)

Question 13

semispinalis thoracis, O, I, A, IN

Answer 13

O- Tps of lower 6 t vert

I- Sps of vert 5-6 levels above

A- bilaterally extends spine, uni laterally flexes spine

In- Medial branches of PPR near

Question 14

Semispinalis cervicus

Answer 14

O- TP of upper 6 t vert

I- SPs C2-C5

A- bilateraly extends spine, uni laterally flexes spine

IN- medial branches of PPR nearby

Question 15

Semispinalsis capitis

Answer 15

O- Tp of c7 + upper 6 T

I- occipital bone bw sup and inf nuchal lines

A- bi and uni- extends head

IN- medial branches of PPR near