back myology

Question 1

Shapes of skeletal muscle

Answer 1

• Flat
• pennate
• fusiform
• digastric
• multiventral
• multicaudal
• serrated
• circular or sphincteral
• quadrate

Question 2

back muscle organization with six layers innervation

Answer 2

Back musculature can be organized into several categories: 1. Deep and Superficial, 2. Extrinsic and Intrinsic, 3. Deep, Intermediate and Superficial or 4. Six Layers. The most descriptive of these is the Six Layer model that will be described here. The superficial three layers are Extrinsic (innervated by a branch of an Anterior Ramus or Cranial nerve) while the deep three layers are Intrinsic (innervated by Posterior Rami).

Question 3

Layer 1

Answer 3

1. Trapezius M.
2. Latissimus Dorsi M.

Question 4

Layer 2

Answer 4

1. Rhomboid Major M.
2. Rhomboid Minor M.
3. Levator Scapulae M.

Question 5

Layer 3

Answer 5

1. Serratus Posterior Superior M.
2. Serratus posterior inferior M.

Question 6

Layer 4

Answer 6

1. Splenius Capitus M.
2. Splenius Cervicis M.

Question 7

Layer 5

Answer 7

(Erector Spinae)

1. Iliocostalis (lateral group)
   
   1. Iliocostalis Lumborum M.
   2. Iliocostalis THoracis M.
   3. Ilicostalis Cervicis M.
2. Longissimus (intermediate group)
   
   1. Longissimus Thoracis M.
   2. Longissimus Cervicis M.
   3. Longissimus Capitis M.
3. Spinalis (medial group)
   
   1. spinalis Thoracis M
   2. spinalis Cervicis M
   3. spinalis Capitis M.

Question 8

Layer 6

Answer 8

1. Semispinalis group
   
   1. semispinalis Thoracis M.
   2. Semispinalis Cervicis M.
   3. Semispinalis Capitis M.
2. Multifidus M
3. Rotatores Longus M.
4. Rotatores Brevis M.

Question 9

Other deeps back muscles

Answer 9

Interspinalis M.

Intertransversarii M.

Levator Costarum Longus M.

Levator Costarum Brevis M.

Question 10

Suboccipital region

Answer 10

1. rectus Capitis posterior major M.
2. rectus capitis posterior minor M.
3. obliquus capitis inferior M.
4. olbliquus capitus superior M.

Question 11

Trapezius M.

Answer 11

Question 12

Latissimus Dorsi M.

Answer 12

Question 13

Rhomboid Major M.

Answer 13

Question 14

Rhomboid Minor M.

Answer 14

Question 15

Levator scapulae M.

Answer 15

Question 16

Serratus Posterior Superior M.

Answer 16

Question 17

Serratus Posterior Inferior M.

Answer 17

Question 18

Splenius Capitis M.

Answer 18

Question 19

Splenius Cervicis M.

Answer 19

Question 20

Iliocostalis Lomborum M.

Iliocostalis Cervicis M.

Iliocostalis Thoracis M.

Answer 20

Question 21

Longissimus Capitis M.

Longissimus Thoracis M.

Longissimus Cervicis M.

Answer 21

Question 22

Spinalis Capitis M.

Spinalis Thoracis M.

Spinalis Cervicis M.

Answer 22

Question 23

Semispinalis Capitis M.

Semispinalis Thoracis M.

semispinalis Cervicis M.

Answer 23

Question 24

Multifidus M.

Answer 24

Question 25

Rotatores Longus M.

Rotatores Brevis M.

Answer 25

Question 26

Interspinalis M.

Intertransversarii M.

Answer 26

Question 27

Rectus Capitis Posterior Major M.

Rectus Capitis Posterior Minor M.

Obliquus Capitis Inferior M.

Obliquus Capitis Superior M.

Answer 27

Question 28

Levator Costarum Longus M.

Answer 28

O: Transverse Processes C7-T11

I: 2nd rib inferior to origin
A: Elevate ribs
N: Posterior Rami

Question 29

Levator Costarum Brevis M.

Answer 29

O: Transverse Processes C7-T11

I: Adjacent rib inferior to origin

A: Elevate ribs
N: Posterior Rami