Term
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Definition
Origin: Cartilages of ribs 2-6, body of sternum, and inferior, medial portion of clavicle
Insertion: Crest of greater tubercle and lateral tip of intertubercular sulcus of humerus
Action: Flexion, adduction, and medial rotation at shoulder
Innervation: Pectoral nerves (C5-T1) |
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Term
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Definition
Origin: Anterior surfaces and superior margins of ribs 3-5 or 2-4 and the fascia covering the associated external intercostal muscles
Insertion: Coracoid process of scapula
Action: Depresses and protracts shoulder; rotates scapula so glenoid cavity moves inferiorly (downward rotation); elevates ribs if scapula is stationary
Innervation: Medial pectoral nerve (C8,T1) |
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Term
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Definition
Origin: First rib
Insertion: Clavicle (inferior border of middle 1/3)
Action: Depresses and protracts shoulder
Innervation: Nerve to subclavius (C5-C6) |
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Term
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Definition
Origin: Inferior border of each rib
Insertion: Superior border to more inferior rib
Action: Elevates ribs
Innervation: Intercostal nerves (branches of thoracic spinal nerves) |
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Term
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Definition
Origin: Superior border of each rib
Insertion: Inferior border of the more superior rib
Action: Depresses ribs
Innervation: Intercostal nerves (branches of thoracic spinal nerves) |
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Term
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Definition
Origin: External and inferior borders of ribs 5-12
Insertion: External oblique aponeuroses extending to linea alba and iliac crest
Action: Compresses abdomen; depresses ribs; flexes, laterally flexes, or rotates vertebral column to the opposite side
Innervation: Intercostal nerves 5-12, iliohypogastric, and ilioinguinal nerves |
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Term
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Definition
Origin: Thoracolumbar fascia, inguinal ligament, and iliac crest
Insertion: Inferior surfaces of ribs 9-12, costal cartilages 8-10, linea alba, and pubis
Action: Compresses abdomen; depresses ribs; flexes, laterally flexes, or rotates vertebral column to the same side
Innervation: Intercostal nerves 5-12, iliohypogastric, and ilioinguinal nerves |
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Term
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Definition
Origin: Superior surface of pubis around symphysis
Insertion: Inferior surfaces of cartilages (ribs 5-7) and xiphoid process of sternum
Action: Depresses ribs, flexes vertebral column and compresses abdomen
Innervation: Intercostal nerves (T7-T12) |
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Term
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Definition
Origin: Cartilages of ribs 6-12, iliac crest, and thoracolumbar fascia
Insertion: Linea alba and pubis
Action: Compresses abdomen
Innervation: Intercostal nerves 5-12, iliohypogastric, and ilioinguinal nerves |
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Term
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Definition
Origin: Anterior and superior margins of ribs 1-8, 1-9, or 1-10
Insertion: Anterior surface of vertebral border of scapula
Action: Protracts shoulder; rotates scapula so glenoid cavity moves superiorly (upward rotation)
Innervation: Long thoracic nerve (C5-C7) |
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Term
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Definition
Origin: Xiphoid process, ribs 7-12 and associated costal cartilages, and anterior surfaces of lumbar vertebrae
Insertion: Central tendinous sheet
Action: Contraction expands thoracic cavity, compresses abdominopelvic cavity
Innervation: Phrenic nerves (C3-C5) |
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