Back Myology

Question 1

Trapezius M. Origin and insertion

Answer 1

Spinous process of C7 to C12, ligamentum Nuchae, External Occipital Protuberance and Medial 1/3 of Superior Nuchal line of Occipital B.

Lateral 1/3 of the clavicle, acromion and scapular spine

Question 2

Trapezius Action

Answer 2

Whole muscle (Rotate point of the Glenoid Cavity
superiorly, Retract the Scapula), Upper fibers (Elevate Scapula),
Lower fibers (Depress Scapula) With the Scapula fixed the
Upper fibers will Extend the Neck working bilaterally, Laterally
Flex the Neck and Rotate the Face away when working
unilaterally

Question 3

Trapezius M Innervation

Answer 3

Motor: Spinal Accessory N. CN XI
Sensory: C3, C4

Question 4

Latisimus Dorsi M. origin and Insertion

Answer 4

Spinous processes of T6-T12, ribs 9-12, iliac crest and Spinous Processes of L1-L5 and median sacral Crest via Thoracolumbar Fascia

Floor of the Humeral Intertubercular Groove

Question 5

Latissimous Dorsi M. Action

Answer 5

Extend, Adduct and medially rotate the Humerus, rotate the Lenoid Cavity inferiorly

Question 6

Latissimus Dorsi Innervation

Answer 6

Thoracodorsal Nerve (C6-C8)

Question 7

Rhomboid Major m Orgin and insertion

Answer 7

Spinous process of T2 to T5

Medial border of the scapula (inferior to scapular spine)

Question 8

Rhomboid Major m action

Answer 8

Retract and elevate the scapula and rotate the glenoid cavity inferiorly

Question 9

Rhomboid Major M. Innervation

Answer 9

Dorsal Scapular N (C4,5)

Question 10

Rhomboid Minor M Orgin and insertion

Answer 10

Spinous process of C7 and T1, lower part of the ligamentum Nuchae

Medial Border of the scapula (at scapular spine)

Question 11

Rhomboid Minor M. Action

Answer 11

Retract and elevate the scapula and rotate the glenoid cavity inferiorly

Question 12

Rhomboid Minor M Innervation

Answer 12

Dorsal Scapular N. (C4, C5)

Question 13

Levator Scapulae M. Orgin and Insertion

Answer 13

Posterior tubercles of the Transverse process C1-C4

Medial border of the scapula (superior to scapular spine)

Question 14

Levator scapulae M Action

Answer 14

Elevate the scapula and rotate the glenoid cavity inferiorly and when the scapula is fixed Extend and laterally flex the neck

Question 15

Levator Scapule m. Innervation

Answer 15

Dorsal Scapular N (C3, 4, and 5)

Question 16

Serratus Posterior Superior M. Orgin and Insertion

Answer 16

Nuchal L, and spinous processes C7-T3

Superior surfaces of the ribs 2-4

Question 17

Serratus Posterior Superior M Action

Answer 17

Elevate the ribs with forced inspiration (Primarily proprioception)

Question 18

Serratus Posterior Superior M Innervation

Answer 18

Intercostal N (2-5)

Question 19

Serratus Posterior Inferior M. orgin and insertion

Answer 19

Spinous processes T11-L2

Inferior Surface of Ribs 8-12

Question 20

Serratus Posterior Inferior actions

Answer 20

Depress ribs with forced expiration (primarily proprioceptive

Question 21

Serratus Posterior inferior innervation

Answer 21

Anterior Rami T9-T12

Question 22

Splenius Capitis M. Origin and Insertion

Answer 22

lower 1/2 Nuchal L. Spinous process C7-T3

Mastoid process of the Temporal B, Lateral 1/3 Superior Nuchal Line of the Occipital B.

Question 23

Splenius Capitis M Action

Answer 23

Etend the neck when working Bilaterally

laterally flex
the Neck and rotate face toward when working unilateral

Question 24

Splenius Capitis M Innervation

Answer 24

Posterior Rami C3-C5

Question 25

Splenius Cervicis M origin and innsertion

Answer 25

Spinous processes T3-T6 Tranversous Processes C1-3(4)

Question 26

Splenius Cervicis M Action

Answer 26

Extend the neck when working bilaterally and Laterally flex the neck and rotate face toward muscle when working unilaterally

Question 27

Splenius Cervicis M Innervation

Answer 27

Poster Rami C5-C7

Question 28

Erector Spinae Group innervation

Answer 28

Segmentally innervated by posterior Rami of the spinal nerves

Question 29

Erector Spinae Group Actions

Answer 29

Maintain erect posture and extend the Vertebral column and head when working Bilaterally and laterally flex the Vertebral column when working unilaterally

Question 30

Illiocostalis muscle groups

Answer 30

Illiocostalis Lumborum Illiocostalis Thoracis Illiocostalis Cervicis Travel from Costal Angles of Ribs

Question 31

Longissimus Muscle Groups

Answer 31

Longissimus Thoracis M Longissimus Cervicis M Longissimus Capitis M Travel via the transverse and Articular processes

Question 32

Spinialis Muscle groups

Answer 32

Spinialis Thoracis M Spinialis Cervicis M Spinialis Capitis M Travel between Spinous processes

Question 33

Back Sprain

Answer 33

injury to the ligamentous attachments between bone usually due to inadequate stretching before activity

Question 34

Back Strain

Answer 34

Excessive stretching and sometimes tearing of muscle fibers produced by an overly strong muscle contraction

Question 35

Semispinalis muscle group description and innervation

Answer 35

``` Layer 6 Transversospinalis Group Extends 5 or more spinal segments Semispinalis Thoracis M Semispinalis Cervicis M Semispinalis Capitis M ``` Innervated by Posterior Rami

Question 36

Semispinalis Capitis M action

Answer 36

Extend head and rotate the face away

Question 37

Multifidius M

Answer 37

Extends 3 or 4 spinal segments O: Mamillary processes of Lumbar Vertebrae, Transverse Processes of Thoracic Vertebrae and Articular Processes of C4-7 I: Spinous processes three numeric segments superior, does not insert onto the Atlas Extend spine and rotate the spine away Inn: Posterior Rami

Question 38

Rotatores Longus M.

Answer 38

Extends 2 spinal segments O: Transverse process I: Roots of spinous process 2 numeric segments superior Extend spine and rotate the spine away Inn: Posterior Rami

Question 39

Rotatores Brevis M

Answer 39

Extending to adjacent spinal Segment Transverse process to roots of spinous process 1 numeric segment away Primarily proprioceptive Posterior Rami

Question 40

Interspinalis M

Answer 40

O: Spinous process I: Adjacent Spinous process A: Extend Spine N: Posterior Rami

Question 41

Intertransversarii M

Answer 41

``` O: Transverse process I: Adjacent transverse process A: Laterally Flex spine N: Posterior portion (Posterior Rami), Anterior portion (Anterior Rami) ```

Question 42

Levator Costarum Longus M

Answer 42

O: Transverse Processes C7-T11 I: 2nd rib inferior to origin A: Elevate ribs N: Posterior Rami

Question 43

Levator Costarum Brevis M

Answer 43

O: Transverse Processes C7-T11 I: Adjacent rib inferior to origin A: Elevate ribs N: Posterior Rami

Question 44

Rectus Capitis Posterior Major M

Answer 44

Medial border of the suboccipital triangle O: Spinous Process C2 I: Lateral portion Inferior Nuchal Line A: Extend Head, Rotate Face toward N: Suboccipital N

Question 45

rectus Capitis posterior Minor M

Answer 45

O: Posterior tubercle C1 I: Below Inferior Nuchal Line A: Extend Head N: Suboccipital N.

Question 46

Obliquus Capitis Inferior M

Answer 46

Inferior Border of the Suboccipital Triangle O: Spinous Process C2 I: Transverse process C1 A: Rotate the Face toward N: Suboccipital N.

Question 47

Obliquus Capitis Superior M

Answer 47

Lateral Border of the Suboccipital triangle O: Transverse process C1 I: Between Superior and Inferior Nuchal Lines A: Extend and Laterally Flex Head N: Suboccipital N.

Question 48

What is in the middle of the Suboccipital triangle

Answer 48

Traveling through the floor of the suboccipital triangle is the Vertebral A and the suboccipital N which is C1 cervical spinal N