Spinal Anatomy Pt 3

Question 1

What back muscles are in the superficial layer?

Answer 1

Trapezius and Latissimus dorsi

Question 2

What back muscles make up the intermediate layer

Answer 2

levator Scapulae, Rhomboids, Serratus posterior sup and inf

Question 3

what back muscles make up the deep layer

Answer 3

Spelius Capitis and Cervicis, Erector Spinae, Semispinalis Capitis and Cervicis, Rotator Costarum, Interspinalis, Intertransversus, Multifidus

Question 4

The erector Spinae are arranged into three parallel groups, the _______, ______ and ________. which are further divided into what subgroups

Answer 4

Iliocostalis (Cervicis/Thoracis and Lumborum)
Longissiums (Capitis/cervicis/thoracis)
Spinalis (Capitis/Cervicis/Thoracis)

Question 5

What supplies the erector spinae muscle group?

Answer 5

Dorsal Rami of Segmental Spinal Nerves

Question 6

Which muscles are the most medial of the back muscles

Answer 6

Multifidus

Question 7

what is the origin and insertion of the multifidi muscles

Answer 7

Originate on laminae and Mammilary Processes

Insert of Spinous Process of vertebrae 2 or 3 levels up

Question 8

What is the Action of Multifidi Muscles

Answer 8

Extension, Lateral Bending and Contralateral Rotation

Question 9

What is the Purpose of Multifidi Muscles

Answer 9

Loaded with Mechnoreceptors to provide feedback on initiating corrective movements

Question 10

Intertransversari Muscles are divided into medial and lateral components. Why?

Answer 10

medial component is true back muscle innervated by Dorsal Rami

Lateral Component is not - innervated by Ventral Rami

Question 11

What is the function of the intertransversarii muscle

Answer 11

act as mechanoreceptors to help stabilize the vertebrae during movement