Muscles of the Spine : Erector Spinae Group

Question 1

What are the muscles of the Erector Spinae Group?

Answer 1

1. Iliocostalis
2. Longissimus
3. Spinalis

Question 2

Iliocostalis

Answer 2

O : Sacrum, Iliac Crest and Ribs 3-12
I : Ribs 1-12 and TVP of C4-C7
A :
1. Extends the trunk and neck at the spinal joints
2. Laterally flexes the trunk and neck at the spinal joints

Question 3

Iliocostalis Cervicis

Answer 3

O : Angle of ribs 3-6
I : TVPs of C4-C6
A :
1. Extends the trunk and neck at the spinal joints
2. Laterally flexes the trunk and neck at the spinal joints

Question 4

Iliocostalis Thoracis

Answer 4

O : Angle of ribs 7-12
I : Angle of ribs 1-6 and TVP of C7
A :
1. Extends the trunk and neck at the spinal joints
2. Laterally flexes the trunk and neck at the spinal joints

Question 5

Iliocostalis Lumborum

Answer 5

O : Medial iliac crest and median and lateral sacral crests
I : Angle of ribs 7-12
A :
1. Extends the trunk and neck at the spinal joints
2. Laterally flexes the trunk and neck at the spinal joints

Question 6

Longissimus

Answer 6

O : Sacrum, Iliac Crest, TVP and SP of L1-L5 and T1-T5 and Articular Processes of C5-C7
I : Ribs 4-12, TVP of T1-T12 and C2-C6 and the Mastoid Process of the Temporal bone
A :
1. Extends the trunk and neck at the spinal joints
2. Laterally flexes the trunk and neck at the spinal joints

Question 7

Longissimus Capitis

Answer 7

O : TVP of T1-T5 and articular processes of C3-C6
I : Mastoid process of the temporal bone
A :
1. Extends the trunk, neck and head at the spinal joints
2. Laterally flexes the trunk, neck and head at the spinal joints

Question 8

Longissimus Cervicis

Answer 8

O : TVPs of T1-T5
I : Posterior tubercles of TVPs of C2-C6
A :
1. Extends the trunk, neck and head at the spinal joints
2. Laterally flexes the trunk, neck and head at the spinal joints

Question 9

Longissimus Thoracis

Answer 9

O : Medial iliac crest, posterior sacrum and TVPs of L1-L5
I : TVPs of T1-T12 + ribs 3-12
A :
1. Extends the trunk, neck and head at the spinal joints
2. Laterally flexes the trunk, neck and head at the spinal joints

Question 10

Spinalis Cervicis

Answer 10

O : Inferior nuchal ligament and SP of C7
I : SP of C2
A :
1. Extends the trunk and neck at the spinal joints
2. Laterally flexes the trunk and neck at the spinal joints

Question 11

Spinalis Thoracis

Answer 11

O : SPs of T11-L2
I : SPs of T4-T8