Term
| Sternocleidomastoid Origin Insertion Function |
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Definition
Sternum
Mastoid Process
Rotation of head |
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Term
| Trapezius Origin Insertion Function |
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Definition
Occipital Bone, c-7 and all t spines
Acromion and spinous process of scapula, lateral third of clavical
Extends the head; raises, rotates, and adducts scapula |
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Term
| Latissimus Dorsi Origin Insertion Function |
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Definition
Indirect attachment to lower six vertebrae, iliac crest, last three to four ribs, lumbar vertabrae
Floor of intertubercular sulcus of humerus
Prime mover of arm extension; adducts and medially rotates arm, depresses scapula |
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Term
| Erector spinae (group) (long tripartite muscle) Origin Insertion Function |
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Definition
Iliac crest, transerse process of lumbar, thoracic, and cervical vertebrae, and/or ribs 3-6 depending on specific part
Ribs and transverse process of vertebrae about six segments above origin
Extend and bend the vertebral column laterally; fibers of the longissimus also extend head |
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Term
| Pectoralis Major Origin Insertion Function |
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Definition
Sternum, Clavicle
Fibers converge to insert by short tendon into interbubercular sulcus of humerus
Prime mover of arm flexion; adducts, medially rotates arm |
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Term
| External Intercostals Origin Insertion Function (11 pairs) |
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Definition
Inferior border of rib above
Superior border of rib below
Pulls ribs toward one another to elevate rib cage; aids in inspiration; antagonist to internal intercostals |
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Term
| Internal Intercostals Origin Insertion Function (11 pairs) |
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Definition
Inferior border of rib above
Superior border of rib below
Draws ribs together to depress rib cage; aids in forced expiration; antagonist to external intercostals |
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Term
| Deltoid Origin Insertion Function |
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Definition
Lateral 1/3 of clavicle; acromion and spine of scapula
Deltoid tuberosity of humerus
Acting as a whole, prime mover of arm abduction |
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Term
| Biceps Brachii Origin Insertion Function |
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Definition
Short head: coracoid process
Radial tuberosity
Flexion of forearm |
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Term
| Brachialis Origin Insertion Function |
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Definition
Distal portion of anterior humerus
Coronoid process of ulna
Major flexor of forearm |
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Term
| Triceps Brachii Origin Insertion Function |
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Definition
Margin of glenoid cavity
Olecranon process of ulna
Extension of forearm |
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Term
| Supinator Origin Insertion Function |
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Definition
Lateral epicondyle of humerus
Proximal end of radius
Acts with biceps brachii to supinate forearm |
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Term
| Pronator Teres Origin Insertion Function |
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Definition
Medial epicondyle of humerus and coronoid process of ulna
Midshaft of radius
Acts synergistically with pronator quadratus to pronate forearm |
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Term
| Brachioradialis Origin Insertion Function |
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Definition
Lateral ridge at distal end of humerus
Base of styloid process of radius
Synergist in forearm flexion |
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Term
| External Oblique Origin Insertion Function |
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Definition
Anterior surface of last eight ribs
Linea alba, pubic crest and tubercles, and iliac crest
Flexes and rotates vertebral column |
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Term
| Internal Oblique Origin Insertion Function |
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Definition
Lumbar fascia, iliac crest, and inguinal ligament
Linea alba
Flexes and rotates vertebral column |
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Term
| Rectus Abdominis Origin Insertion Function |
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Definition
Pubic crest and symphysis
Xiphoid process and costal cartilages of ribs 5-7
Flexes and rotates vertebral column |
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Term
| Transverse Abdominis Origin Insertion Function |
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Definition
Lumbar fascia, iliac crest, and inguinal ligament, cartilages of last 5 or 6 ribs
Linea alba and pubic crest
Compresses abdomen |
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