MSK Back Myology Extras

Question 1

Layer 1 Back Muscles

Answer 1

Trapezius M.
N: Spinal Accessory Nerve
A: Transverse Cervical Artery

Latissiumus Dorsi M.
N and A: Thoracodorsal

Actions: Shoulder/Scapula Movement
elevation, depression of scapula, rotation, medially rotoation, extension/adduction

Question 2

Layer 2 Back Muscles

Answer 2

Rhomboid Major M, Rhomboid Minor M, Levator Scapulae M.

N and A: Dorsal Scapular A and N

Action: Elevate Scapula, retract; neck ext.

Question 3

Layer 3 Back Muscles

Answer 3

Serratus Posterior Superior and Inferior MM.

Intercostal A and N; Intercostal A, Anterior Rami of T9-12

Action: Proprioception, forced breathing

Question 4

Layer 4 Back Muscles

Answer 4

Splenius Capitis and Splenius Cervicis MM

N: Posterior Rami

A: Unilateral Flexion, rotation toward (of the neck)

Question 5

Layer 5 Back Muscles

Answer 5

Erector Spinae MM

N: Posterior Rami
A: Bilateral extension, unilateral flexion, erect posture

Iliocostalis: Lumborum, Thoracic, Cervicis

Longissimus: Thoracis, Cervicis, Capitis

Spinalis: Thoracis, Cervicis, Capitis

Question 6

Layer 6 Back Muscles

Answer 6

Transverse Spinalis MM

N: Posterior Rami
A: Extend and Rotate away, rotatores will also propriocept

Rotatotres Brevis and Longus, Multifidus, Semispinalis Thoracis, Semispinalis Cervicis, Semispinalis Capitis

Question 7

Other Back Muscles

Answer 7

Interspinalis and Intertransversaris

N: Suboccipital Nerve
A: Extend or Flex

Question 8

Suboccipital Triangle

Answer 8

Rectus Capitis Posterior Major and Minor MM, Obliquus Capitis Superior and Inferior MM

N: Suboccipital N
A: Head and Neck Motion (Extend or laterally flex)