1. 1.04 STRUCTURES OF THE MUSCULAR SYSTEM

2. The Muscular System Comprises nearly half our weight.
Over 650 muscles.
Each muscle is made up of hundreds or thousands of muscle fibers.
1.04 Remember the structures of the muscular system

3. The Muscular System: Muscle Fibers
Bundles of threadlike structures called myofibrils
Composed of:
Myosin- thick myofibrils made of proteins
Actin- thin myofibrils made of proteins
Form overlapping pattern called sarcomere
muscle muscle fiber
sarcolemma sarcomere
functional unit of muscle movement
1.04 Remember the structures of the muscular system

4. Structures of the muscular system
Muscles
Skeletal
Smooth
Cardiac
Sphincter
Connective tissue
Tendons
Fascia
1.04 Remember the structures of the muscular system

5. Structures of the muscular system
Types of muscle
Skeletal
Smooth
Cardiac
Sphincter
1.04 Remember the structures of the muscular system

6. Structures of the muscular system
Types of Muscle
SKELETAL MUSCLES
Attached to bone
Striated (striped) appearance
Voluntary
Multinucleated muscle cell bundles
1.04 Remember the structures of the muscular system

7. Structures of the muscular system
Types of Muscle
SMOOTH MUSCLES
Also known as visceral muscles
Involuntary
Located in walls of digestive system, uterus & blood vessels
1.04 Remember the structures of the muscular system

8. Structures of the muscular system
Types of Muscle
CARDIAC MUSCLE
Found only in the heart
Striated, branched
Involuntary
Cells are fused- when one contracts, they all contract, creating the heartbeat
1.04 Remember the structures of the muscular system

9. Structures of the muscular system
Types of Muscle
SPHINCTER MUSCLES
Also called dilator muscles
Special, circular muscles
Located in the
digestive system
urinary system
1.04 Remember the structures of the muscular system

10. Structures of the muscular system
Connective tissue
Tendons
dense bands that connect skeletal muscle to the bone
1.04 Remember the structures of the muscular system

11. Structures of the muscular system
Connective tissue
Fascia
Fibrous connective tissue sheets that wrap around muscle bundles
1.04 Remember the structures of the muscular system

12. How do skeletal muscles get their names?
Location-where
Number/Location of origin and insertion
Size-maxi/mins
Action
Number of origins
Shape
Combination
1.04 Remember the structures of the muscular system
However,
not all muscles are named by the above methods!

13. Head & Neck Muscles pg
1.04 Remember the structures of the muscular system

14. Torso/Trunk pg 204-205 (anterior)
1.04 Remember the structures of the muscular system

15. Torso/Trunk (anterior)
1.04 Remember the structures of the muscular system

16. Torso/Trunk (posterior)
1.04 Remember the structures of the muscular system

17. Upper extremities
1.04 Remember the structures of the muscular system

18. Lower extremities
1.04 Remember the structures of the muscular system