Deep Back Muscles

Question 1

Superficial

Spenius Capitis Muscle

Spenius Cervicis Muscle

Answer 1

Origin:
Nuchal ligament, spinous process of T1-6

Insertion (capitis): Lateral Mastoid porcesses/ superior nuchal line.

Insertion: (Cervicis): Tubercles of transverse processes of C1-4.

Innervation: Dorsal rami of spinal nerves

Question 2

Serratus Posterior Superior Muscle

Answer 2

Origin: Nuchal Ligament, spinous processes of C7-T3

Insertion: Superior border of ribs 2-4

Innervation: Intercostals 2nd -5th Nerve

Question 3

Serratus Posterior Inferior Muscle

Answer 3

Origin: Spinous processes ot T11-L2

Insertion: Inferior borders of ribs 8-12

Innervation: Intercostals/subcostals

Question 4

Iliocostalis Muscle

Answer 4

Origin: Most lateral portion of erector spinae group

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

Innervation: Dorsal Rami of spinal nerves.

Question 5

Longissimus Muscle

Answer 5

Origin: Middle portion of erector spinae group.

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

Innervation: Dorsal rami of spnal nerves

Question 6

Spinalis Muscle

Answer 6

Origin: Medial portion of erector spinae group

Insertion: Fibers run superiorly to spinous processes in upper thoracic region and to cranium

Innervation: Dorsal rami of spinal nerves

Question 7

SemiSpinalis Muscle

Answer 7

Origin: Runs superomedially from transverse processes to spinous processes

Insertion: Capitis, cervicis, & thoracis portions

Innervation: Dorsal Rami of spinal Nerves

Question 8

Muldifidius

Answer 8

Origin: Transverse processes from sacrum to C2

Insertion: Spinous Processes

Innervation: Dorsal rami of spinal nerves.

Question 9

Rotatores Muscles

Answer 9

Brevis: Transverse process of one vertebra to spinous process of next vertebra.

Longus: Transverse Process of one vertebra to spinous process of 2nd vertebra above.

Innervation: Dorsal Rami of Spinal Nerves

Question 10

Interspinales Muscles

Answer 10

Origin: Spinous process of one vertebra

Insertion: Spinous process of next vertebra

Innervation: Dorsal Rami of spinal nerves.

Question 11

Intertransversari Muscles

Answer 11

Origin: Transverse process of one vertebra

Insertion: Transverse process of next vertebra above

Innervation: Dorsal/ventral rami of spinal nerves.

Question 12

Levator Costarum Muscle

Answer 12

Origin: Posterior end of rib

Insertion: Transverse process of next vertebra above

Innervation: Dorsal/Ventral rami of spinal nerves