-
Trapezius
- attach: occipital bone, ligamentum nuchae, C7-T12 vert., clavicle, acromion and spine of scapula
- innerv: spinal accessory n. (CN XI)
- action:
- superior fibers elevate scapula
- middle fibers retract scapula
- inferior fibers depress scapulae
- superior & inferior fibers together cause upward or superior rotation of scapula
-
Rhomboids (Major and Minor together)
- attach: ligamentum nuchae, C7-T5 vert., scapula - medial border from spine to inferior angle
- innerv: dorsal scapular n.
- action: retracts, inferiorly rotates, and stabilizes scapula
-
Levator Scapulae
- attach: C1-C4 vert., scapula - supero-medial border
- innerv: dorsal scapular n.
- action: elevates & inferiorly rotates scapula
-
Latissimus Dorsi
- attach: T7-T12 vert., thoracolumbar fascia, ribs 10-12, iliac crest, humerus - bicipital or intertubercular groove
- innerv: thoracodorsal n.
- action: extends, adducts, & medially rotates humerus
-
Serratus Posterior Superior
- attach: C7-T3 vert., ligamentum nuchae, ribs 2-5 (2 vertebrae up)
- innerv: T1-T3 intercostal (ventral rami) nerves
- action: elevates ribs (accessory muscle of respiration)
-
Serratus Posterior Inferior
- attach: T11-L2 vert., thoracolumbar fascia, ribs 9-12 (2 vertabrae down)
- innerv: T10-T12 intercostal nerves
- action: depresses ribs (accessory muscle of respiration)
-
Splenius Capitis
- attach: ligamentum nuchae, C7 - T4 vert., mastoid process & occipital bone
- innerv: dorsal rami nerves.
- action: extend & laterally bend (or flex) the neck
-
Splenius Cervicis
- attach: T3-T6 spinous processes, C1-C4 transverse processes
- innerv: dorsal rami nerves
- action: extend & laterally bend (or flex) the neck
-
Erector Spinae (iliocostalis, longissimus, and spinalis together)
- attach: cervical, thoracic, inf. lumbar vertebrae, sacrum, iliac crest, ribs, mastoid process (of temporal bone)
- innerv: dorsal rami of spinal nerves.
- action: extend the vertebral column and head & laterally bend/flex the vertebral column
-
Transversospinales Group (semispinalis, multifidus, rotatores together)
- attach: transverse processes & spinous processes of vertebrae
- innerv: dorsal rami of spinal nerves
- action: extend, laterally bend (or flex), rotate, and stabilize the vertebral column
-
Interspinalis and Intertransverse muscles
- attach: between spinous processes (interspinalis); between transverse processes (intertransverse)
- innerv: dorsal rami of spinal nerves
- action: aids in extension and rotation of vertebral column (interspinales); aids in lateral
- bending and stabilizing vertebral column (intertransverse)
-
superficial back muscles diagram
|
|
