Deep Back Muscles

Question 0

Longissimus

Answer 0

Origin: Broad tendon from 1)posterior part of iliac crest, 2)posterior surface of the sacrum, 3)sacro-iliac ligaments, 4)supraspinous ligament, 5)sacral and inferior lumbar spinous processes

Insertion: Fibers run superiorly to ribs between tubercles and angles to 1)transverse processes in thoracic and cervical regions and to 2)mastoid process of temporal bone

Innervation: Posterior rami of spinal nerves

Question 1

Iliocostalis

Answer 1

Origin: Broad tendon from 1) posterior part of iliac crest, 2)posterior surface of the sacrum, 3)sacro-iliac ligaments, 4)supraspinous ligament, 5)sacral and inferior lumbar spinous processes

Insertion: Fibers run superiorly to angles of lower ribs and cervical transverse processes

Innervation: Posterior rami of spinal nerves

Question 2

Spinalis

Answer 2

Origin: Broad tendon from 1) posterior part of iliac crest, 2)posterior surface of the sacrum, 3)sacro-iliac ligaments, 4)supraspinous ligament, 5)sacral and inferior lumbar spinous processes

Insertion: Fibers run superiorly to 1)spinous processes in upper thoracic region and to the 2)cranium

Innervation: posterior rami of spinal nerves