Muscles of the Back

Question 1

Name the Origin, Insertion, Action, and Nerve for:

Serratus Posterior Superior

Answer 1

O: Lower C/S and Upper T/S SP

I: Upper Ribs

A: Elevates Ribs

N: Intercostal N T1-T3

Question 2

Name the Origin, Insertion, Action, and Nerve for:

Serratus Posterior Inferior

Answer 2

O: Lower T/S and Upper L/S SP

I: Lower Ribs

A: Depresses Ribs

N: Intercostal N T9-T12

Question 3

Name the Origin, Insertion, Action, and Nerve for:

Splenius Capitis

Answer 3

O: C/S and Upper T/S SP

I: Mastoid Process & Occipital Bone

A: Extend, Ipsilateral Flex, Ipsilateral Rot

N: Dorsal rami of inferior cervical N

Question 4

Name the Origin, Insertion, Action, and Nerve for:

Splenius Cervicis

Answer 4

O: Upper T/S SP

I: Upper C/S TP

A: Ext, Ipsilateral Flex, Ipsilateral Rot

N: Dorsal Rami of inferior cervical N

Question 5

Name the Origin, Insertion, Action, and Nerve for:

Iliocostalis (Lumborum, Thoracis, Cervicis)

Answer 5

O: Iliac Crest - Angles of Upper Ribs

I: Angles of Lower ribs - Lower C/S TP

A: Extend, Ipsilateral Flex, Ipsilateral Rot

N: Dorsal Rami

Question 6

Name the Origin, Insertion, Action, and Nerve for:

Longissimus (Thoracis - Capitis)

Answer 6

O: Lumbar TP - Lower C/S TP

I: T/S TP - Mastoid Process

A: Ext, Ipsilateral Flex, Ipsilateral Rot

N: Dorsal Rami

Question 7

Name the Origin, Insertion, Action, and Nerve for:

Spinalis (Thoracis - Cervcis)

Answer 7

O: Upper L/S Sp - Lower Ligamentum Nuchae

I: Upper T/S SP - Axis SP

A: Ext, Ipsilateral Flex, Ipsilateral Rot

N: Dorsal Rami

Question 8

Name the Origin, Insertion, Action, and Nerve for:

Semispinalis

Answer 8

O: Lower T/S TP - Lower C/S TP

I: Upper T/S SP - Occipital Bone

A: Ext, Ipsilateral Flex, Contralateral Rot

N: Dorsal Rami

Question 9

Name the Origin, Insertion, Action, and Nerve for:

Multifidus

Answer 9

O: Sacrum, Lower L/S - C/S TP

I: SP of adjacent Superior 2-5 vertebra

A: Extend, Ipsilateral Flex, Ipsilateral Rot

N: Dorsal Rami

Question 10

Name the Origin, Insertion, Action, and Nerve for:

Rotatores

Answer 10

O: L/S - C/S TP

I: SP of adjacent vert. (1=brevis) (2= Longus)

A: Ext, Ipsilateral Flex, Ipsilateral Rot

N: Dorsal Rami

Question 11

Name the Origin, Insertion, Action, and Nerve for:

Interspinalis

Answer 11

O: L/S - C/S SP

I: L/S - C/S SP

A: Extend

N: Dorsal Rami

Question 12

Name the Origin, Insertion, Action, and Nerve for:

Intertransversarii

Answer 12

O: L/S - C/S TP

I: L/S - C/S TP

A: Ipsilateral Flexion

N: Dorsal Rami

Question 13

Name the Origin, Insertion, Action, and Nerve for:

Quadratus Lumborum

Answer 13

O: TP of upper L/S and 12th Rib

I: Iliac Crest

A: Ext, Ipsilateral Flex

N: Nerve of T12, Upper L/S nerves