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Chest and Abdomen
Muscles of the Chest and Abdomen
11
Anatomy
Undergraduate 3
10/16/2011

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Term
Pectoralis major
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)
Term
Pectoralis minor
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)
Term
Subclavius
Definition
Origin: First rib

Insertion: Clavicle (inferior border of middle 1/3)

Action: Depresses and protracts shoulder

Innervation: Nerve to subclavius (C5-C6)
Term
External intercostals
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)
Term
Internal intercostals
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)
Term
External oblique
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
Term
Internal oblique
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
Term
Rectus abdominis
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)
Term
Transverse abdominis
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
Term
Serratus anterior
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)
Term
Diaphragm
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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