Abdominal muscles

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Last updated 4:02 AM on 9/26/26
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14 Terms

1
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Anterior scalene OIAI

Origin: Cervical vertebrae TPs (C3-C6)

Insertion: Rib 1

Action: lateral flexion and flexion of the neck. Elevation of rib 1

Innervation: Spinal (C)

2
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Middle scalene OIAI

Origin: Cervical vertebrae TPs (C2-C7)

Insertion: Rib 1

Action: Lateral flexion of the neck, elevation of Rib 1

Innervation: Spinal

3
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Posterior scalene OIAI

Origin: Cervical vertebrae TP (C4/C5-C7)

Insertion: Rib 2

Action: Lateral flexion of the neck, elevation of Rib 2

Innervation: Spinal

4
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Sternocleidomastoid OIAI

Origin: Sternum, clavicle

Insertion: Temporal (mastoid process)

Action: Flexion of head (BL), lateral flexion, and contralateral rotation

Innervation: Accessory

5
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Diaphragm OIAI

Origin: Ribs 7-12, L1-L3

Insertion: Central tendon

Action: Inhalation

Innervation: Phrenic

6
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Quadratus lumborum OIAI

Origin: Ilium (posterior crest)

Insertion: Rib 12, L1-L4/L5

Action: Lateral flexion and extension of the trunk, elevation of the pelvis while walking

Innervation: Spinal nerves

7
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Iliacus OIAI

Origin: Ilium

Insertion: Femur

Action: Flexion of the thigh at the hip

Innervation: Femoral

8
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Psoas major OIAI

Origin: L1-L5

Insertion: Femur

Action: Flexion of the thigh at the hip and trunk

Innervation: Spinal

9
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Transversus abdominis OIAI

Origin: Ribs (7-12)

Insertion: Linea alba

Action: Compress/support abdominal viscera, exhalation

Innervation: Spinal

10
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Internal oblique OIAI

Origin: Ilium, inguinal ligament, and thoracolumbar fascia

Insertion: Linea alba

Action: Flexion, lateral flexion, and same side rotation of trunk

Innervation: spinal

11
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External oblique OIAI

Origin: Ribs 4/5-12

Insertion: Linea alba, inguinal ligament, and ilium

Action: flexion, lateral flexion, and opposite side rotation of the trunk, assists in forcible exhalation

Innervation: Spinal nerves

12
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Rectus abdominis OIAI

Origin: Pubis

Insertion: Sternum and costal cartilages

Action: Flexion, lateral flexion of trunk, assists in forcible exhalation

Innervation: Spinal

13
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Serratus posterior superior OIAI

Origin: C7-T2/3

Insertion: Ribs 2-5

Action: Elevates ribs to assist inhalation

Innervation: spinal nerves

14
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Serratus posterior inferior OIAI

Origin: T11-L2/L3

Insertion: Ribs 9-12

Action: Depresses rubs to assist expiration

Innervation: Spinal nerves