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Muscles of Expiration
Muscles of Expiration
11
Anatomy
Graduate
09/14/2011

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Cards

Term
Muscle: Internal Intercostal
Definition
Origin: Inferior margin of ribs 1-11
Course: Down and Laterally
Insertion: Superior surface of the rib below
Innervation: Intercostal Nerves
Function: Depresses ribs 1-11
Term
Muscle: Innermost Intercostal
Definition
Origin: Superior margin of ribs 1-11
Course: Down and laterally
Insertion: Superior surface of the rib below
Innervation: Intercostal nerves
Function: Depresses ribs 1-11
Term
Muscle: Transversus Thoracis
Definition
Origin: Inner thoracic lateral margin of the sternum
Course: Laterally
Insertion: Surface of ribs 2-6
Innervation: Thoracic intercostal nerves
Function: Depresses the rib cage
Term
Muscle: Subcostal
Definition
Origin: Inner posterior thorax
Course: Down and lateral
Insertion: Inner surface of second or third rib below
Innervation: Intercostal nerves
Function: Depresses the thorax
Term
Muscle: Serratus Posterior Inferior
Definition
Origin: Spinous process of T11, T12, L1-L3
Course: Up and lateral
Insertion: Lower margin of ribs 7-12
Innervation: Intercostal nerves
Function: Pulls the rib cage down
Term
Muscle: Transverse Abdominis
Definition
Origin: Abdominal wall at the vertebral column
Course: Lateral
Insertion: inner surface of ribs and at the pubis
Innervation: Thoracic and lumbar nerves
Function: Compresses abdomen
Term
Muscle: Internal Oblique Abdominis
Definition
Origin: Inguinal ligament and iliac crest
Course: Fans medially
Insertion: Lower ribs
Innervation: Thoracic and lumbar nerves
Function: Rotates trunk, flexes trunk, compresses abdomen
Term
Muscle: External Oblique Abdominis
Definition
Origin: Osseous portion of the lower 7 ribs
Course: Fans downward
Insertion: Iliac crest, inguinal ligament, rectus abdominis
Innervation: Subcostal nerve
Function: Bilateral contraction flexes vertebral column and compresses abdomen; unilateral contraction results in trunk rotation
Term
Muscle: Rectus Abdominis
Definition
Origin: Originates at pubis
Course: Up
Insertion: Xiphoid process of sternum, lower ribs
Innervation: Intercostal nerves
Function: Flexion of vertebral column
Term
Muscle: Quadratus Lumborum
Definition
Origin: Iliac crest
Course: Fans up and in
Insertion: Transverse processes of the lumbar vertebrae and rib 12
Innervation: Thoracic nerve and lumbar nerves
Function: Bilateral contraction fixes the abdominal wall in support of abdominal compression
Term
Muscle: Latissimus Dorsi
Definition
Origin: Lumbar, sacral, and lower thoracic vertebrae
Course: Fans up
Insertion: Humerus
Innervation: Brachial plexus
Function: Stabilizes the posterior abdominal wall
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