Back Muscles Intrinsec, INTERMIDIATE Layer

Question 1

Illocostalis cervicis

Answer 1

O: 3rd-7th ribs
I: C4-C6 (transverse processes)
N: Spinal nn. C8-L1 (posterior rami, lateral branches)
A: Billateral: Extends spine
Unilateral: Bends spine laterally to same side

Question 2

Illocostalis Thoracis

Answer 2

O:7th-12th ribs
I: 1st-6th ribs
N: Spinal nn. C8-L1 (posterior rami, lateral branches)
A: Billateral: Extends spine
Unilateral: Bends spine laterally to same side

Question 3

Illocostalis Lumborum

Answer 3

O: Sacrum, iliac crest; thoracolumbar fascia
I: 6th-12th ribs; thoracolumbar fascia (deep layer); upper lumbar vertebrae (transverse Processes)
N: Spinal nn. C8-L1 (posterior rami, lateral branches)
A: Billateral: Extends spine
Unilateral: Bends spine laterally to same side

Question 4

Longissimus Capitis

Answer 4

O: T1-T3 (transverse processes); C4-C7 (transverse and articular processes)
I: Temporal Bone (mastoid process)
N: Spinal nn. C1-L5 (posterior rami, lateral branches)
A: Billateral: Extends head
Unilateral: Flexes and rotates head to same side

Question 5

Longissimus cervicis

Answer 5

O: T1-T6 (transverse processes)
I: C2-C5 (transverse processes)
N: Spinal nn. C1-L5 (posterior rami, lateral branches)
A: Billateral: Extends spine
Unilateral: Bends spine laterally to same side

Question 6

Longissimus Thoracis

Answer 6

O: Sacrum, iliac crest, lumbar vertebrae (spinous processes);
lower thoracic vertebrae (transverse processes)
I: 2nd-12th ribs; lumbar vertebrae (coastal processes);
thoracic vertebrae (transverse processes)
N: Spinal nn. C1-L5 (posterior rami, lateral branches)
A: Billateral: Extends spine
Unilateral: Bends spine laterally to same side

Question 7

Spinalis cervicis

Answer 7

O: C5-T2 (spinous processes)
I: C2-C5 (spinous processes)
N: Spinal nn. (posterior rami)
A: Billateral: Extends cervical and thoracic spine
Unilateral: Bends cervical and thoracic spine to same side

Question 8

Spinalis Thoracis

Answer 8

O: T10-L3 (spinous processes, lateral surfaces)
I: T2-T8 (spinous processes, lateral surfaces)
N: Spinal nn. (posterior rami)
A: Billateral: Extends cervical and thoracic spine
Unilateral: Bends cervical and thoracic spine to same side