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Chapter 9: Muscular System
Lecture #1
What is Moebius syndrome?
• Absence of the sixth and seventh cranial nerves which carry impulses from the brain to the muscles of the face
• Symptoms?
What treatment did Chelsey Thomas receive?
• Underwent two ‘smile’ surgeries
• At 7yo, transplant of nerve and muscle tissue from legs to either side of her mouth
3 Types of Muscle Tissue
• Skeletal Muscle Tissue
• Cardiac Muscle Tissue
• Smooth Muscle Tissue
Skeletal Muscle Tissue
• Tissues you’ll find in skeletal muscle
Ske le tal Musc le Tis sue
Nervous Tis sueBlood
Conne ctive Tis sue
Structure of a Skeletal Muscle
A. Connective Tissue Coverings
:Fasc ia
- s e parate s individualmusc le
- holds musc le in pos ition
- . .dense c t
- proje c ts be yond musc le to form tendon
Structure of a Skeletal Muscle
A. Connective Tissue Coverings
:Tendon
- may inte rtw ine w ithpe rios te um
Structure of a Skeletal Muscle
A. Connective Tissue CoveringsTendons :
musc le to boneattachment
Aponeurose s : fibrous she e ts
attaching to bone or to othe r musc le
Tendinitis & Tenosynovitis
• Green box on p. 286
• What is it & what causes it?
• Where is it most commonly found?
Structure of a Skeletal Muscle
• Epimysium
• Perimysium
• Endomysium
muscle
fascicle
Musclefiber
Myofibril
C.T. Functions
• E• P• E
• Functions: allows parts to move somewhat independently
• Also, blood vessels and nerves pass through these layers
Compartmentment Syndrome
• Green box on p. 286• What is it?
• What is the treatment?
Fascia layers (c.t. layers)
• Fascia is interconnected throughout body to• Deep fascia: surrounds muscle• Subcutaneous fascia: just beneath the skin• Subserous fascia: c.t. layer of serous
memb over organs and in body cavities
Structure of a Skeletal Muscle• C.T. coverings
• Skeletal Muscle Fibers
2. Aponeurosis &Tendons
1. Fascia 3. EpimysiumPerimysiumEndomysium 4. fascicles
Structure of a Skeletal Muscle• Skeletal Muscle Fibers
Structure of a Skeletal Muscle• Skeletal Muscle Fibers
Structure of a Skeletal Muscle• A Single Muscle Cell = Muscle ________
• Forms from many undifferentiated cells that fuse during development
• CHARACTERISTICS:• MULTINUCLEATED• THIN• ELONGATED CYLINDER WITH ROUNDED
ENDS
Structure of a Skeletal Muscle
• Sarcomeres connected end-to-end make up ______________
• Functional unit of muscle contraction = _______________
• Striation pattern
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