Deep Back

Question 1

Splenius

Answer 1

Origin: Spines of T1-T4

Insertion: Occipital and Temporal bones, Transverse processes of C2-C3

Action: Extend neck and head (rotated in unilateral action)

Nerve: Dorsal rami of spinal nerves

Question 2

Erector Spinae - Iliocostalis

Answer 2

Origin: Iliocostalis from ilium and ribs

Insertion: Iliocostalis to ribs

Action: Extend trunk and vertebral column

Nerve: Dorsal rami of spinal nerves

Question 3

Erector Spinae - Longissimus

Answer 3

Origin: Longissimus from transverse processes of vertebrae

Insertion: Longissimus to transverse processes of vertebrae

Action: Extend trunk and vertebral column

Nerve: Dorsal Rami of spinal nerves

Question 4

Erector Spinae - Spinalis

Answer 4

Origin: Spinalis from spinous processes

Insertion: Spinalis to spinous processes

Action: Extend trunk and vertebral column

Nerve: Dorsal rami of spinal nerves

Question 5

Transversospinalis

Answer 5

Origin: Tansverse processes of vertebrae

Insertion: Spines of vertebrae superior to origin

Action: Extend trunk in bilateral action and rotate vertebral column in unilateral action

Nerve: Dorsal rami of spinal nerves

Question 6

How many vertebrae do semispinalis span? Multifidus? Rotatores?

Answer 6

Semispinalis - extend 5 or 6

Multifidus - extend 3 or 4

Rotatores - extend 1 or 2