Muscles 2

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Wilfrid Laurier University
Health Sciences
Health Sciences 2300A/B
Jamie Melling

Deep Back Muscles: - Collectively termed the Erector Spinae (three muscles) -Are responsible for keeping you upright while standing / VC aligned - Iliocostalis: Thoracolumbar Fossa / Ileum  Ribs - Longissimus:Thoracolumbar Fossa  Transverse Processes - Spinalis: Thoracolumbar Fossa  Spinous Processes - All composed predominantly of ST fibers - Innervation:All innervated by dorsal rami (only muscles in body using this) Deepest back Musculature: - Innervation: Dorsal Rami - Termed Transversospinalis Muscles (between spinous processes) - Function: Lateral flexion, extension, and rotation of vertebrae - Intertransversarius: Transverse Process  Transverse Process - Rotatores: Spinous Process  Transverse Process 1 Below - Multifidus: Spinous Process  Transverse Process 2 Below - Interspinalis: Spinous Process  Spinous Process Below Superficial Pectoral Muscles: - Pectoralis Major: Sternum / Medial Third of Clavicle  Greater Tubercle - Innervated by Pectoral Nerves -Adducts / medially rotates shoulder / flexes shoulder - Deltoid: Lateral 2/3 of Clavicle /Acromion Process / Spine of Scapula  Deltoid Tuberosity on humerus - Innervated byAxillary Nerve - 3 Actions: - Shoulder Flexion / Medial Rotation ofArm - Shoulder Abduction - Shoulder Extension / Lateral Rotation of arm Deep Pectoral Region: Muscle Origin Insertion Innervation Pectoralis Minor - Ribs 1-3 - Coracoid - Pectoral Nerve Process Subscapularis - Subscapul- - Lesser - Subscapular ar Fossa Tubercle Nerve Intercostals: - External Intercostals: Used for inhalation - Thumbs in Front Pockets - Internal Intercostals: Used for exhalation (only forced exhalation) - Thumbs in Back Pockets - 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  Decrease in SurfaceArea - Innervation: Intercostal Nerves (run in subcostal groove) Diaphragm: - Innervation: Phrenic Nerve - Phrenic Nerve roots off of C3/C4/C5 - If the chord is severed above C3, one cannot breathe, but if it is severed below one can still breathe, just takes much more effort - Origin: Throughout the peripheral of body - Insertion: Central Tendon - Holes in the diaphragm allow structures to pass into lower parts of the body (such as the spinal chord, inferior vena cava, and the esophagus) - When the diaphragm flatte
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