Health Sciences 2300A/B Lecture Notes - Posterior Ramus Of Spinal Nerve, Pectoralis Major Muscle, Multifidus Muscle

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Collectively termed the erector spinae (three muscles) Are responsible for keeping you upright while standing / vc aligned. Iliocostalis: thoracolumbar fossa / ileum ribs. Innervation: all innervated by dorsal rami (only muscles in body using this) Function: lateral flexion, extension, and rotation of vertebrae. Rotatores: spinous process transverse process 1 below. Multifidus: spinous process transverse process 2 below. Interspinalis: spinous process spinous process below. Pectoralis major: sternum / medial third of clavicle greater tubercle. Adducts / medially rotates shoulder / flexes shoulder. Deltoid: lateral 2/3 of clavicle / acromion process / spine of scapula . Shoulder flexion / medial rotation of arm. Shoulder extension / lateral rotation of arm. Internal intercostals: used for exhalation (only forced exhalation) Innermost intercostals: located behind the nerve/artery/vein in the groove. All intercostals run from inferior border of rib to superior border of rib. Inhalation diaphragm flattens exhale returns to dome shape . Innervation: intercostal nerves (run in subcostal groove)

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