1.04 Remember
the structures
of the
muscular system
Essential Question
• What are the structures of the muscular
system?
1.04 Remember the 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
• Actin
– 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
Connective tissue
 Skeletal
 Tendons
 Smooth
 Fascia
 Cardiac
 Sphincter
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
Types of Muscle
 Skeletal
 Smooth
 Cardiac
 Sphincter
1.04 Remember the structures of
the muscular system
11
Structures of the muscular system
Types of Connective tissue
 Tendons
 Fascia
1.04 Remember the structures of
the muscular system
12
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
13
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
14
How do skeletal muscles get
their names?
• Location of origin and
insertion
• Location
• Size
• Action flexor
• Direction
• Extensor
• Number of origins
• Depressor
• However,
• not all muscles are named by the above methods!
1.04 Remember the structures of
the muscular system
15
Head & Neck Muscles
1.04 Remember the structures of
the muscular system
16
Torso/Trunk
(anterior)
1.04 Remember the structures of
the muscular system
17
Torso/Trunk
(anterior)
1.04 Remember the structures of
the muscular system
18
Torso/Trunk
(posterior)
1.04 Remember the structures of
the muscular system
19
Upper extremities
1.04 Remember the structures of
the muscular system
20
Lower extremities
1.04 Remember the structures of
the muscular system
21
The muscular system review
Anterior view
1.04 Remember the structures of
the muscular system
22
The muscular system review
Posterior view
1.04 Remember the structures of
the muscular system
23
1.04 Remember the structures of the
muscular system
Essential Question
• What are the structures of the muscular
system?
1.04 Remember the structures of
the muscular system
24