HAP Chapter 8 Muscular System 8.7-8.8 A. Read pg.
Description: HAP Chapter 8 Muscular System 8.7-8.8 A. Read pg. 182 B. Origin and Insertion 1. Where do muscles attach? a. one end attaches to an immovable part and one end attaches to a moveable part 2. Origin the immovable end of the muscle 3.
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slide1. HAP Chapter 8 Muscular System 8.7-8.8<br>
slide2. A. Read pg. 182…
B. Origin and Insertion
1. Where do muscles attach?
a. “one end attaches to an immovable part and one end attaches to a moveable part”
2. Origin – the immovable end of the muscle
3. Insertion – the moveable end of the muslce
*When a muscle contracts, its insertion is pulled toward its origin.
4. Can have more than one origin or insertion. I. Skeletal Muscle Actions<br>
slide3. a. Ex: Biceps Brachii
5. Flexion vs. Extension
decreasing joint angle
increasing joint angle<br>
slide4. C. Interaction of Skeletal Muscles
1. Agonists vs. Synergists
a. Agonists – prime mover muscle
b. Synergists – other muscles that aid in movement or stability.
c. Ex: lifting your arm up…
deltoid = agonist
trapezius, levator scapulae… = synergist
d. Antagonist – act as a prime mover against a muscle.
What would the antagonist be of the triceps brachii? Biceps brachii<br>
slide5. A. Superficial Muscles – name may indicate size, shape, location, action, number, or direction of fibers.
1. Ex: pg. 184 (bolded)
-pectoralis major…
-deltoid…
-extensor digitorum…
-biceps brachii…
-sternocleidomastoid…
-external oblique… II. Major Skeletal Muscles large triangle function Two heads or origins Attachment sites Location and muscle fiber direction<br>
slide6. B. Facial Expression Muscles<br>
slide7. C. Mastication Muscles<br>
slide8. D. Muscles that Move the Head<br>
slide9. E. Muscles that move the Pectoral Girdle<br>
slide10. F. Muscles that move the Arm<br>
slide11. G. Muscles that move the forearm<br>
slide12. H. Muscles that move the thigh<br>
slide13. I. Muscles that move the leg<br>
slide14. J. Muscles that move the foot<br>
slide2. A. Read pg. 182…
B. Origin and Insertion
1. Where do muscles attach?
a. “one end attaches to an immovable part and one end attaches to a moveable part”
2. Origin – the immovable end of the muscle
3. Insertion – the moveable end of the muslce
*When a muscle contracts, its insertion is pulled toward its origin.
4. Can have more than one origin or insertion. I. Skeletal Muscle Actions<br>
slide3. a. Ex: Biceps Brachii
5. Flexion vs. Extension
decreasing joint angle
increasing joint angle<br>
slide4. C. Interaction of Skeletal Muscles
1. Agonists vs. Synergists
a. Agonists – prime mover muscle
b. Synergists – other muscles that aid in movement or stability.
c. Ex: lifting your arm up…
deltoid = agonist
trapezius, levator scapulae… = synergist
d. Antagonist – act as a prime mover against a muscle.
What would the antagonist be of the triceps brachii? Biceps brachii<br>
slide5. A. Superficial Muscles – name may indicate size, shape, location, action, number, or direction of fibers.
1. Ex: pg. 184 (bolded)
-pectoralis major…
-deltoid…
-extensor digitorum…
-biceps brachii…
-sternocleidomastoid…
-external oblique… II. Major Skeletal Muscles large triangle function Two heads or origins Attachment sites Location and muscle fiber direction<br>
slide6. B. Facial Expression Muscles<br>
slide7. C. Mastication Muscles<br>
slide8. D. Muscles that Move the Head<br>
slide9. E. Muscles that move the Pectoral Girdle<br>
slide10. F. Muscles that move the Arm<br>
slide11. G. Muscles that move the forearm<br>
slide12. H. Muscles that move the thigh<br>
slide13. I. Muscles that move the leg<br>
slide14. J. Muscles that move the foot<br>