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Muscular System - PowerPoint PPT Presentation


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Muscular System. Functions Voluntary movement Forms some sphincters Protection of some organs Stabilization of some joints Posture Heat production. Muscular System. Organs Muscles. Muscular System. Organs Muscles (includes tendons and aponeuroses) .

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muscular system
Muscular System
  • Functions
      • Voluntary movement
      • Forms some sphincters
      • Protection of some organs
      • Stabilization of some joints
      • Posture
      • Heat production
muscular system2
Muscular System
  • Organs
    • Muscles
muscular system3
Muscular System
  • Organs
    • Muscles (includes tendons and aponeuroses)
slide6
Structure of Skeletal Muscles
    • Muscle fibers
      • Contractile units within:
slide7
Structure of Skeletal Muscles
    • Muscle fibers
      • Contractile units within:
        • Sarcomeres
slide9
Structure of Skeletal Muscles
    • Muscle fibers
      • Contractile units within:
        • Sarcomeres
slide10
Structure of Skeletal Muscles
    • Muscle fibers
      • Contractile units within:
        • Sarcomeres
        • Sarcomeres linked end-to end
slide11
Structure of Skeletal Muscles
    • Muscle fibers
      • Contractile units within:
        • Sarcomeres
        • Sarcomeres linked end-to end; form myofibrils
slide14
Muscle fibers bundled into fascicles
  • Fascicles bundled to form the muscle
slide17
Connective Tissue in Muscle
    • Endomysium
    • Perimysium
slide18
Connective Tissue in Muscle
    • Endomysium
    • Perimysium
    • Epimysium
slide20
How Muscles Create Movement at Joints
    • Muscles must cross joints
    • Insertion pulled towards origin
fascicle organization
Parallel

Greatest range of motion

Fascicle Organization
fascicle organization23
Parallel

Pennate

Strongest force of contraction

Fascicle Organization
fascicle organization25
Parallel

Pennate

Convergent

Greatest versatility

Fascicle Organization
fascicle organization26
Parallel

Pennate

Convergent

Circular

Fascicle Organization
slide31

Muscle-Bone Lever Systems

E

R

F

Third-class lever

slide32

Muscle-Bone Lever Systems

E

R

F

Third-class lever

slide33

E

R

F

Third-class lever

slide34

E

R

F

Third-class lever

slide35

E

R

F

Third-class lever

slide38

Muscle-Bone Lever Systems

E

R

F

Third-class lever

slide39

Muscle-Bone Lever Systems

E

R

F

Third-class lever

slide40

Muscle-Bone Lever Systems

E

R

F

Third-class lever

slide41

Muscle-Bone Lever Systems

E

R

F

Second-class lever

slide42

Muscle-Bone Lever Systems

E

R

F

First-class lever

muscle interaction
Muscle Interaction
  • Prime Mover
    • Muscle most responsible for an action
      • e.g.: abduction of arm: deltoid
muscle interaction45
Muscle Interaction
  • Synergistic muscles
    • Assists prime mover
      • e.g.: supraspinatus assists deltoid in abduction
muscle interaction47
Muscle Interaction
  • Fixator muscles
    • Holds bone of origin steady
      • e.g.: serratus anterior holds deltoid’s bone of origin steady during abduction
muscle interaction49
Antagonistic muscles

Action opposite that of the prime mover

e.g.: lats and pects adduct

must not contract during abduction

Muscle Interaction
slide50
 Muscle names may indicate the direction of the muscle fibers (e.g., transversus abdominis, external oblique).
slide52
 Muscle names may indicate the direction of the muscle fibers (e.g., transversus abdominis, external oblique).
  • A muscle may be named according to its location (e.g., temporalis, tibialis anterior).
slide54
Some muscles are named on the basis of shape (e.g., deltoid, serratus anterior).
  • Muscles may be named after their origin and insertion (e.g., sternocleidomastoid).
slide55
A muscle may be named according to its location (e.g., temporalis, tibialis anterior).
  • Muscles may be named for their number of origins (e.g., triceps brachii, quadriceps femoris).