Back Myology Flashcards
Understand the back muscles, action, innervation, blood supply
Trapezius m. (layer 1)
Upper Fibers: Elevate Scapula Lower Fibers: Depress Scapula Rotate Glenoid Cavity Superiorly Extend neck bilaterally Laterally flex neck Rotate face away
N: CN XI (Spinal accessory n.)
Blood Supply: Transverse cervical a.
Latissimus Dorsi m. (layer 1)
Extend/aDduct humerus, medially rotate humerus
Rotate glenoid cavity inferiorly
N: Thoracodorsal n.
Blood Supply: Thoracodorsal a.
Levator Scapulae m. (layer 2)
Retracts and elevates scapula
Rotates glenoid cavity inferiorly
N: Dorsoscapular n.
Blood Supply: Dorsoscapular a.
Rhomboid Major m. (Layer 2)
Retracts and elevates scapula
Rotates glenoid cavity inferiorly
N: Dorsoscapular n.
Blood Supply: Dorsoscapular a.
Rhomboid Minor m. (Layer 2)
Retract and elevate scapula
Rotate glenoid cavity inferiorly
N: Dorsoscapular n.
Blood Supply: Dorsoscapular a.
Serratus Posterior Superior m.
Elevates ribs during forced inspiration/proprioception
N: Intercostal N (2-5)
Blood Supply: Posterior intercostals a.
Serratus posterior inferior m.
Depresses ribs during forced expiration.
N: Anterior Rami
Blood Supply: Lumbar a, (1st 2), Subcostal a. (rest)
Splenius Cervicis m.
Extend neck, unilaterally flex neck, rotate face towards
N: Posterior Rami
A: Occipital a.
Splenius capitis m.
Extend neck, unilaterally flex neck, rotate face towards
N: Posterior rami
A: Occipital a.
Ileocostalis m.
One of the erector spinae muscles: (Lumborum, Thoracis, Cervicis)
N: Posterior rami
A; Muscular branches of aorta
Longisimus m.
One of the erector spinae muscles (thoracis, cervicis, capitis)
N: Posterior rami
A: Muscular branches of aorta
Semispinalis m.
One of the erector spinae muscles (thoracics, cervicis, capitis)
N: Posterior Rami
A: Muscular branches of the aorta
Transversospinalis m.
N: Posterior Rami
A: Posterior intercostal a., lumbar a.
Spinalis m.
N: Posterior Rami
A: Posterior intercostal a., Lumbar a.
