Muscles of the back

Question 1

Origin of serratus posterior superior muscle

Answer 1

Lower portion of ligamentum nuchae, spinous processes of C7-T3

Question 2

Insertion of serratus posterior superior muscle

Answer 2

Upper border of Rib 2-5, Lateral to the angle

Question 3

Innervation of serratus posterior superior muscle

Answer 3

Anterior rami of T2-T5

Question 4

Action of serratus posterior superior muscle

Answer 4

Elevates Ribs 2-5

Question 5

Origin of serratus posterior inferior muscle

Answer 5

Spinous processes of T11-L3, Supraspinous ligament.

Question 6

Insertion of serratus posterior inferior muscle

Answer 6

Lower border of Ribs 9-12, Lateral to angle

Question 7

Innervation of serratus posterior inferior muscle

Answer 7

Anterior rami of T9-T12

Question 8

Action of serratus posterior inferior muscle

Answer 8

Depresses Ribs 9-12, may prevent lower ribs from elevating during diaphragm contraction.

Question 9

Origin of splenius capitis

Answer 9

Lower half of ligamentum nuchae, spinous processes of C7-T4

Question 10

Insertion of splenius capitis

Answer 10

Mastoid process, skull below Lateral ⅓ of Superior nuchal line

Question 11

Innervation of splenius capitis muscles

Answer 11

Posterior rami of Middle Cervical Nerves

Question 12

Action of splenius capitis muscles

Answer 12

Together – Draws head backward, extend neck.
Individually – Draw and rotate head to one side.

Question 13

Origin of splenius cervisis

Answer 13

Spinous processes of T3-T6.

Question 14

Insertion of splenius cervisis muscles

Answer 14

Transverse processes of C1-C3.

Question 15

Innervation of splenius cervisis muscles

Answer 15

Posterior rami of Lower Cervical Nerves.

Question 16

Action of splenius cervisis muscles

Answer 16

Together – Extend neck.
Individually – Draw and rotate head to one side.

Question 17

Origin of iliocostalis muscle

Answer 17

Sacrum and spinous processes of lumbar and lower two thoracic vertebrae, and the iliac crest.

Question 18

Insertion of iliocostalis muscle

Answer 18

Transverse processes of C4-C6

Question 19

Origin of longissimus muscle

Answer 19

Transverse processes of lumbar vertebrae

Question 20

Insertion of longissimus

Answer 20

Posterior margin of Mastoid process

Question 21

Origin of spinalis muscle

Answer 21

Transverse processes of lumbar vertebrae

Question 22

Insertion of spinalis muscle

Answer 22

Blends with semispinalis capitis

Question 23

Action of all erector spinae muscles

Answer 23

Primary extensors of the vertebral column and head.

Bilaterally – Straighten the back, returning it to the upright position, pulls head posteriorly.

Unilaterally – Bends vertebral column laterally, turns head to actively contracting side.

Question 24

Origin of rectus capitis posterior major muscle

Answer 24

Spinous processes of axis (C2).

Question 25

Insertion of rectus capitis posterior major muscle

Answer 25

Lateral part of skull, below the inferior nuchal line

Question 26

Action of rectus capitis posterior major muscle

Answer 26

Extension of head, rotation of head to face same side

Question 27

Origin of rectus capitis posterior minor muscle

Answer 27

Posterior tubercle of atlas (C1).

Question 28

Insertion of rectus capitis posterior minor muscle

Answer 28

Medial part of skull, below the inferior nuchal line

Question 29

Action of rectus capitis posterior minor muscle

Answer 29

Extension of head

Question 30

Origin of obliquus capitis superioris

Answer 30

Transverse process of atlas (C1).

Question 31

Insertion of obliquus capitis superioris

Answer 31

Occipital bone between nuchal lines

Question 32

Action of obliquus capitis superioris

Answer 32

Extension of head, bends head to the side

Question 33

Origin of obliquus capitis inferioris

Answer 33

Spinous process of axis (C2).

Question 34

Insertion of obliquus capitis inferioris

Answer 34

Transverse process of atlas (C1).

Question 35

Action of obliquus capitis inferioris

Answer 35

Rotation of head to face same side