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11 Cards in this Set
- Front
- Back
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internal oblique |
Origin: Linea alba (coursing upward to join into thecostal margins and xiphoid) Insertion: Iliac crest Innervation: T5-12 VentralRami. Action: -Trunk flexion; -Lateral trunk flexion to the same side; -Rotates the trunk to the same side |
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External oblique |
Origin: Outerportion of the ribs 5-8. Insertion: Lineaalba Innervation: T5-12ventral Rami. Action: -Trunk flexion -Lateral trunk flexion toward the opposite side. -Rotates the trunk to the opposite side |
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Rectus Abdominis |
Origin: Cartilageof 5,6,7 ribs, xiphoid process. Insertion: Pubiccrest and symphysis Innervation: T5-12 ventral Rami. Action: -Right and left rectus abdominis actingtogether flex the spine. -Right side of the rectus also doeslateral flexion to the right; the left, left. -Becauseit runs fairly vertical it does not have a line of pull to allow any rotation. |
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Quadratus Lumborum |
Origin: Transverseprocesses of the upper four lumbar vertebrae. Insertion:Iliac Crest Innervation: Lumbarplexus (L1,2,3). Action: -Thismuscle stabilizes the pelvis and the lumbar spine. -It “hikes” the pelvis on the same side. -Whenthe lower extremity is fixed, it lateral flexes the trunk to the same side -When trunk is severely rotated it can cause rotation just to neutral. |
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Superficial Back Group |
Itcontains the trapezius and latissimus dorsi. |
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what are the middlelayer of muscles of the back |
Spinalis group Longissimus group Iliocostalis group |
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2nd order of middle layer back muscles |
Origin & Insertion: Laterally to medial on the trunk. They attach laterally into the ribs and insert into the spinous processes and the sacrum/pelvis. Innervation: Dorsal Rami of spinal nerves T5-12. Action: -Extend. -Rotate to same side. -Laterally flex to the same side. |
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Deepmuscles of the back |
Semispinalis Multifidis Rotatores |
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2nd order of deep muscles of the back |
Origin & insertion: -Medial to lateral as you travelinferiorly down the spine. -From the spinous processes to the transverseprocesses. Innervation: Dorsal Rami of the spinal nerves T5-12 Action: -Extend the spine. -Bend same side -The erector spinaegroup and the deepest grouprotate same side. |
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Quiet breathing muscles Inspiration and Expiration |
Inspiration: 1. Diaphragm– largely! 2. Scalenes 3. ExternalIntercostals Expiration: 1. Elasticrecoil of lung tissue 2. Surfacetension 3. Gravityon ribs 4. Internal intercostals |
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Forced(secondary or accessory muscles) Inspiration and Expiration |
Inspiration: 1. Sternocleidomastoid 2. Pectoralis major 3. Pectoralis minor 4. Serratus anterior 5. Serratusposterior superior 6. Superiorupper iliocostalis Expiration: 1. Abdominals - Externaloblique - Internal oblique - Rectus abdominis 2. Loweriliocostalis 3. Lowerlongissimus 4. Serratus posterior inferior |
