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Muscle 2
Anterior Muscle of the Thorax, Shoulder, and Abdominal Wall
21
Biology
12th Grade
04/14/2014

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Cards

Term
Pectoralis major :: Origin
Definition
Clavicle, sternum, rib 1-6, cartilages
Term
Pectoralis major :: Insertion
Definition
Intertubercular sulcus of humerus
Term
Pectoralis major :: Action
Definition
Shoulder flexion, adducts and medially rotates arm
Term
Serratus anterior :: Origin
Definition
Lateral aspect of ribs 1-8
Term
Serratus anterior :: Insertion
Definition
Medial border of anterior scapula
Term
Serratus anterior :: Action
Definition
Protracts and upwardly rotates scapula
Term
Deltoid :: Origin
Definition
Lateral clavicle, acromion and spine of scapula
Term
Deltoid :: Insertion
Definition
Deltoid tuberosity of humerus
Term
Deltoid :: Action
Definition
Shoulder abduction
Term
Pectoralis minor :: Origin
Definition
Anterior surface of ribs 3-5
Term
Pectoralis minor :: Insertion
Definition
Coracoid process of scapula
Term
Pectoralis minor :: action
Definition
Draws scapula forward and inferiorly
Term
External intercostals :: Origin
Definition
Inferior border of rib above
Term
External intercostals :: Insertion
Definition
Superior border of rib below
Term
External intercostals :: Action
Definition
Elevates rib cage during inspiration
Term
Internal intercostals :: Origin
Definition
Superior border of rib below
Term
Internal intercostals :: Insertion
Definition
Inferior border of rib above
Term
Internal intercostals :: Action
Definition
Depresses rib cage during expiration
Term
Diaphragm :: Origin
Definition
Inferior border of rib and sternum, last 6 ribs and lumbar vertebrae
Term
Diaphragm :: Insertion
Definition
Central tendon
Term
Diaphragm :: Action
Definition
Flattens to increase thoracic volume for inspiration
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