Muscles of the Spinal Joints : Full Spine

Question 1

What are the muscles of the Erector Spinae Group?

Answer 1

1. Iliocostalis
2. Longissimus
3. Spinalis

Question 2

What is the origin, insertion and actions of the Erector Spinae Group?

Answer 2

O : Pelvis
I : Spine, Rib Cage and Head
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 3

What is the origin, insertion and actions of Iliocostalis?

Answer 3

O : Sacrum, Iliac Crest and Ribs 3-12
I : Ribs 1-12 and Transverse Processes 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 4

What is the origin, insertion and actions of Longissimus?

Answer 4

O : Sacrum, Iliac Crest, Transverse Processes and Spinous Processes of L1-L5 and T1-T5 and the Articular Processes of C5-C7
I : Ribs 4-12, Transverse Processes of T1-T12 and C2-C6 and the 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 5

What is the origin, insertion and actions of Spinalis?

Answer 5

O : Spinous Processes of T11-L2 and the Spinous Process of C7 and nuchal ligament
I : Spinous Processes of T4-T8 and the Spinous Process 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 6

What are the muscles of the Transversospinalis Group?

Answer 6

1. Semispinalis
2. Multifidus
3. Rotatores

Question 7

What is the origin, insertion and actions of Transversospinalis Group?

Answer 7

O : Pelvis
I : Spine and Head
A :
1. Extends the trunk, neck and head at the spinal joints
2. Laterally flexes the trunk, neck and head at the spinal joints
3. Contralaterally rotates the trunk and neck at the spinal joints

Question 8

What is the origin, insertion and actions of Semispinalis?

Answer 8

O : Transverse processes of C7-T10 and the Articular Processes of C4-C5
I : Spinous Processes of C2-T4 and the Occipital 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
3. Contralaterally rotates the trunk and neck at the spinal joints

Question 9

What is the origin, insertion and actions of Semispinalis?

Answer 9

O : Transverse processes of C7-T10 and the Articular Processes of C4-C5
I : Spinous Processes of C2-T4 and the Occipital 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
3. Contralaterally rotates the trunk and neck at the spinal joints

Question 10

What is the origin, insertion and actions of Multifudus?

Answer 10

O : Posterior sacrum, Posterior Superior Iliac Spine, Posterior Sacroiliac Ligament and L5-C4 vertebrae
I : Spinous Processes of vertebrae 3-4 segmental levels superior to the inferior attachment
A :
1. Extends the trunk and neck at the spinal joints
2. Laterally flexes the trunk and neck at the spinal joints
3. Contralaterally rotates the trunk and neck at the spinal joints

Question 11

What is the origin, insertion and actions of Rotatores?

Answer 11

O : Transverse Process (Inferiorly)
I : Lamina (Superiorly)
A :
1. Contralaterally rotate the trunk and neck at the spinal joints
2. Extend the trunk and neck at the spinal joints
3. Laterally flex the trunk and neck at the spinal joints