Posterior Muscles

Question 1

Spinalis cervicis

Answer 1

Origin: Spinous processes of c7

Insertion: Spinous processes of c2-4

Action: Spinal extension and lateral flexion

Question 2

Spinalis thoracis

Answer 2

Origin: Spinous processes t11-L2

Insertion: Spinous processes of upper thoracic T1-4 or T8

Action: Spinal extension, lateral flexion

Question 3

Longissmus captius

Answer 3

Origin: Transverse processes t1-4 or 5

Insertion: Mastoid Process

Action: Extension of head, lateral flexion of head and cervical spine, rotation of head

Question 4

Longissimus cervicis

Answer 4

Origin: transverse processes t1-4 or 6

Insertion: transverse processes c2-6

Action: cervical spine extension, lateral flexion, in rotation

Question 5

Iliocastalis cervicis

Answer 5

Origin: Rib angels 3 to 6

Insertion: transverse processes of c4-6

Action: spinal extension, lateral flexion, rotation

Question 6

Iliacostalis thoracis

Answer 6

Origin: lower six ribs

Insertion: upper six ribs, transfers process of C7

Action: spinal extension, lateral flexion, rotation

Question 7

Iliacostalis lumborum

Answer 7

Origin: sacrum
Interior:lower 6 or 7 ribs

Action:spinal extension, lateral flexion, rotation

Question 8

Semispinalis

Answer 8

Origin: transverse processes a C4 to T10

Insertion: n/a

Action: extension, lateral flexion, and rotation of head and cervical spine

Question 9

Quadratus lumborum

Answer 9

Origin: Posterior iliac crest

Insertion: 12th rib

Action: lateral flexion, stabilization of spine and pelvis

Question 10

Longissimus thoracis

Answer 10

Origin: thoracolumbar fascia

Insertion: transverse processes of T1-5

Action: Spinal extension, lateral flexion, rotation