Vocabulary
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Origin- the point of muscle attachment that doesn’t move when contracted
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Insertion- the point of muscle attachment that moves when contracted
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Belly-part of body that contains structure between chest and pelvis
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Aponeurosis- used to attach muscle to muscle or muscle to bone
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Fascia- covers or binds together body sections
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Extensors- a muscle that extends a body part
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Flexors- a muscle that flexes a body part
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Adductors- muscle that moves body part towards middle of body
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Abductors- muscle that moves body part away from the middle of bod
NAME
I​NSERTION
O​RIGIN
​PRIMARY ACTION
Pectoralis Major
Clavicular head: medial half of clavicle
Sternal head: sternum, upper costal cartilages(1-6), and aponeurosis of external oblique
Lateral lip of intertubercular groove of humerus
Crest of the greater tubercle of the humerus
Flexes, extends, medially rotates, and abducts the arm at the shoulder (glenohumeral) joint
Pectoralis Minor
Anterior surfaces of the sternal ends of ribs (3-5)
Coracoid process of scapula
Draws scapula forward and downward
Pectoantebrachialis
Lateral surface of manubrium
Flat tendon on the fascia of the forearm
Adducts the arm
External Oblique
External surfaces of ribs (5-12)
Anterior crest and abdominal aponeurosis to linea alba
Flexes, rotates, and laterally flexes vertebral column
Compresses abdomen
Rectus Abdominis
Pubic Crest
Symphysis Pubis
Costal cartilages of ribs (5-7)
Xiphoid process of sternum
Flexes vertebral column
Compresses abdomen
Latissimus Dorsi
Spinous process of T7-L5
Iliac crest of sacrum
Thoracolumbar fascia
Inferior angle of the scapula
Lower 3 or 4 ribs
Floor of intertubercular groove of humerus
Abducts, medially rotates, and extends the arm at the shoulder joint
Clavotrapezius
External Occipital Protuberance
Medial third of superior nuchal line
Ligamentum nuchae
Spinous process of C7
Lateral third of clavicle
Acromion process
Elevation and upward rotation of scapula
(When contracting with other portions of the trapezius it adducts the scapula)
