Trunk and Back Muscles

Question 1

Serratus Posterior Superior

Answer 1

O: Spinous Processes of C7-T3

I: Posterior surface of 2-5 ribs

N: T1-T4

A: Elevate ribs during inhalation

Question 2

Serratus Posterior Inferior

Answer 2

O: Spinous Processes of T12-L3

I: Posterior surface of 9-12 ribs

N: T9-T11 (12)

A: Depress ribs during exhalation

Question 3

Levator Costarum

Answer 3

O: Transverse Processes of T7-T11

I: Ribs immediately inferior to origin, between turbercle and angle

N: Posterior Rami of C8-T11 nerves

A: Elevate ribs

Question 4

External, Internal, Innermost Intercostals

Answer 4

O: Inferior Border of superior rib
Innermost intercostal - Costal Groove of rib

I: Superior Border of inferior rib

N: Thoracic spinal nerves, Intercostal nerves

A: External Intercostals - Draws ribs superiorly (inhalation)
Internal Intercostals - Draws ribs inferiorly (exhalation)
Innermost Intercostals - Draws ribs inferiorly (exhalation)

Question 5

Subcostal

Answer 5

O: Internal surface of lower ribs

I: Superior surface of 2-3 ribs inferior

N: Intercostal nerves

A: Draws ribs inferiorly (exhalation

Question 6

Splenius Cervicis

Answer 6

O: Spinous Process of T3-T6

I: Transverse Processes C1-C3

N: Cervical Nerves

A: Ipsilateral rotation head/neck; Ipsilateral sidebend head/neck
Bilateral - Extend head/neck

Question 7

Iliocostalis (Cervicis, Thoracis, Lumborum)

Answer 7

O: Common tendon (Lumborum); Posterior surface ribs 1-12 (Cervicis+Thoracis)

I: Lumborum - Transverse Processes Lumbar vertebrae 1-3
Thoracis - Posterior surface ribs 1-6
Cervicis - Transverse Processes of lower cervicals

N: Spinar Nerves (APRs)

A: Unilateral - Ipsilateral lateral flexion
Bilateral - Extend vertebral column

Question 8

Longissimus (Thoracis, Cervicis, Capitis)

Answer 8

O: Common Tendon (Thoracis)

I: Thoracis - Ribs 3-12, Transverse Processes of Thoracis vertebrae
Cervicis - Transverse Processes of Cervical vertebrae
Capitis - Mastoid Process (Temporal Bone)

N: Spinal Nerves (APRs)

A: Unilateral - Ipsilateral Lateral Flexion
Bilateral - Extend Vertebral column

Question 9

Spinalis

Answer 9

O: Spinous Processes of upper Lumbar vertebrae; Spinous Processes of lower Thoracic vertebrae

I: Spinous Processes of upper Thoracic; Spinous Processes of C7-T2

N: Spinal Nerves (APRs)

A: Unilateral - Ipsilateral Lateral Flexion
Bilateral - Extend Vertebral Column

Question 10

Semispinalis

Answer 10

O: Transverse Processes C4-T5

I: Superior and inferior nuchal lines

N: Cervical Nerves (APRs)

A: Extend the vertebral column and head

Question 11

Multifidus

Answer 11

O: Sacrum and Transverse Processes of Lumbar to Cervical

I: 2-4 vertebrae up of Spinous Processes

N: Spinal Nerves (APRs)

A: Unilateral - Contralateral Rotation
Bilateral - Extend the vertebrae

Question 12

Rotatores

Answer 12

O: Transverse Processes of Lumbar through Cervical vertebrae

I: 1-2 Vertebrae up of Spinous Processes; Lumbar through 2nd Cervical Vertebrae

N: Spinal Nerves (APR)

A: Unilateral - Contralateral rotation
Bilateral - Extend the vertebrae

Question 13

Interspinales

Answer 13

O and I: Cervical - Between Spinous Processes of C2-T3
Lumbar - Between Spinous Processes of T12-L5

N: Segmental Spinal Nerves

A: Extend Vertebral Column

Question 14

Intertransversii

Answer 14

O and I: Cervical - Transverse Processes of C2-C7
Lumbar - Transverse Processes of L1-L5

N: Segmental Spinal Nerves

A: Unilateral - Ipsilateral Sidebend
Bilateral - Vertebral Extension

Question 15

Levator Costarum

Answer 15

O: Transverse Processes of T7-T11

I: Ribs immediately inferior to origin between tubercle and angle

N: Posterior Rami C8-T11 Nerves

A: Elevate ribs