Muscle Origins, Insertions, and Actions Flashcards by Bethany Aronson

Q

Latissimus Dorsi: Origin

A

Thoracic vertebrae and thoraco lumbar fascia

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Q

Latissimus Dorsi: Insertion

A

Humerus

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Q

Latissimus Dorsi: Action

A

Retract arm

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Q

Pectoralis: Origin

A

Sternum

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Q

Pectoralis: Insertion

A

Humerus

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Q

Pectoralis: Action

A

Adduct (move toward midline of body) arm

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Q

Supraspinatous: Origin

A

Scapula

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Q

Supraspinatous: Insertion

A

Humerus

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Q

Supraspinatous: Action

A

Protract (lengthen) arm

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Q

Infraspinatous: Origin

A

Scapula

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Q

Infraspinatous: Insertion

A

Humerus

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Q

Infraspinatous: Action

A

Rotates arm

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Q

Rhomboideus: Origin

A

Vertebrae

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Q

Rhomboideus: Insertion

A

Scapula

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Q

Rhomboideus: Action

A

Hold scapula in place

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Q

Serratis ventralis: Origin

A

Ribs

Q

Serratis ventralis: Insertion

A

Scapula

Q

Serratis ventralis: Action

A

Rotates scapula and forms a sling by which weight is transferred to the pectoral girdle

Q

Triceps Branchii Long Head: Origin

A

Scapula

Q

Triceps Brachii Long Head: Insertion

A

Ulna

Q

Triceps Branchii Long Head: Action

A

Extension of forearm

Q

Triceps Branchii Lateral Head: Origin

A

Humerus

Q

Triceps Branchii Lateral Head: Insertion

A

Ulna

Q

Triceps Branchii Lateral Head: Action

A

Extension of forearm

Triceps Branchii Medial Head: Origin

Humerus

Triceps Branchii Medial Head: Insertion

Ulna

Triceps Branchii Medial Head: Action

Extension of forearm

Biceps Branchii (Both heads): Origin

Scapula

Biceps Branchii (Both heads): Insertion

Radius

Biceps Branchii (Both heads): Action

Flex forearm