Back Myology Flashcards
Layer 1
Extrinsic
Trapezius Muscle
Latissimus Dorsi Muscle
Trapezius Muscle
Actions
Whole- Sup rotate glenoid cavity, retract scapula
Upper- Elevate scapula, extend neck, rotate face away
Lower- Depress scapula
Innervation: Accessory Cranial Nerve XI
Transverse cervical artery
Latissimus Dorsi Muscle
Actions: Extend, Adduct, and medially rotate humerus
Inferior rotate glenoid cavity
Innervation: Thoracodorsal Nerve
Thoracodorsal Artery
Layer 2
Extrinsic
Rhomboid Major
Rhomboid Minor
Levator Scapulae
Rhomboid Major
Action: Retract and Elevate Scapula, Inferior rotate glenoid cavity
Innervation: Dorsal Scapular Nerve
Dorsal Scapular Artery
Rhomboid Minor
Action: Retract and Elevate Scapula, Inferior rotate glenoid cavity
Innervation: Dorsal Scapular Nerve
Dorsal Scapular Artery
Levator Scapulae
Action: Elevate scapula, Inferior rotate glenoid cavity, Extend and Laterally flex neck
Innervation: Dorsal Scapular Nerve
Dorsal Scapular Artery
Layer 3
Extrinsic
Serratus Posterior Superior Muscle
Serratus Posterior Inferior Muscle
Serratus Posterior Superior Muscle
Action: Elevate Ribs, Mostly Proprioception
Innervation: Intercostal Nerve
Intercostal Artery
Serratus Posterior Inferior Muscle
Action: Depress Ribs, Mostly Porprioception
Innervation: Anterior Rami
Intercostal Artery
Layer 4
Intrinsic… all innervated by posterior rami
Splenius Capitus Muscle
Splenius Cervicus Muscle
Splenius Capitus Muscle
Action: Extend neck, Rotate face towards and laterally flex neck
Occipital Artery
Splenius Cervicis Muscle
Action: Extend neck, rotate face towards and laterally flex neck
Occipital Artery
Layer 5
Intrinsic… all innervation by posterior rami
Erector Spinae Group: Iliocostalis Muscle (lateral) Longissimus Muscle (intermediate) Spinalis Muscle (medial)
Iliocostalis Muscle
Action: Erect posture, Extend vertebral column and head, Laterally flex vertebral column
3 Parts: Lumborum, Thoracis and Cervicis
Posterior intercostal and lumbar arteries
Longissimus Muscle
Action: Erect posture, Extend spine and head, laterally flex spine
3 parts: Thoracis, Cervicis and Capitis (rotates face towards)
Posterior intercostal arteries and occipital artery (capitis)
Spinalis Muscle
Actions: Erect posture, Extend spine and head, Laterally flex spine
3 parts but hard to distinguish
Posterior intercostal arteries
Layer 6
Intrinsic…innervation by posterior rami
Transversospinalis Group: Semispinalis Muscle Multifidus Muscle Rotatores Longus Muscle Rotatores Brevis Muscle
Semispinalis Muscle
Actions:
Thoracis/Cervicis- Extend spine and rotate spine away
Capitis- Extend head and rotate head away
Posterior intercostal arteries (thoracis) and deep cervical arteries
Multifidus Muscle
Actions: Extend Spine and rotate spine away
Posterior lumbar arteries
Rotatores Longus
Actions: Extend spine, rotate spine away, mostly proprioception
Posterior intercostal arteries
Rotatores Brevis
Actions: Extend spine and rotate spine away, mostly proprioception
Posterior intercostal arteries
Interspinalis Muscle
Action: Extend spine
Vertebral, occipital and posterior intercostal arteries
Intertransversarii Muscle
Action: Laterally flex spine
Deep cervical, vertebral and posterior intercostal arteries
Suboccipital Muscles
Rectus Capitis Posterior Major Muscle
Rectus Capitis Posterior Minor Muscle
Obliquus Capitis Inferior Muscle
Obliquus Capitis Superior Muscle
Rectus Capitis Posterior Major Muscle
Actions: Extend Head, rotate face toward
Innervation: Suboccipital nerve
Vertebral and occipital arteries
Rectus Capitis Posterior Minor Muscle
Action: Extend Head
Innervation: Suboccipital nerve
Vertebral and occipital arteries
Obliquus Capitis Inferior Muscle
Action: rotate face toward
Innervation: Suboccipital nerve
Vertebral and occipital arteries
*not actually attached to Head ( C2 to C1)
Obliquus Capitis Superior Muscle
Actions: Extend and Laterally flex head
Innervation: Suboccipital nerve
Vertebral and occipital arteries
