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MUSCULAR SYSTEM
Learning Objectives
1. To know basic anatomy of muscle
2. Knowledge regarding nomenclature/
classification of muscles
3. Knowledge regarding basic facts of
functioning of muscles
Muscles are responsible for all types
of body movement ? they contract or
shorten and are the machine of the
body
Three basic muscle types are found in the
body
?Skeletal muscle
?Cardiac muscle
?Smooth muscle
Head and Neck Muscles
Figure 6.14
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Slide 6.38
Trunk Muscles
Figure 6.15
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Slide 6.39
Deep Trunk and Arm Muscles
Figure 6.16
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Slide 6.40
Muscles of the Pelvis, Hip, and Thigh
Figure 6.18c
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Slide 6.41
Superficial Muscles: Anterior
Figure 6.20
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Slide 6.43
Superficial Muscles: Posterior
Figure 6.21
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Slide 6.44
Cih?k R., Anatomie 1, Grada Publishing a.s. 2001
Power & Range- Muscle
Contraction
Maximal power generated by a muscle finally
depends on
effective mass of contractile tissue i.e
number and diamentions of contained
fibres
Maximal range of contraction depends on
length of its fibres
Force and range acts at full advantage in
parallel fibres
Classification Of Muscles
A. By Fascicular Orientation
1.Parallel
2.Pennate
3 Spiral
4 Cruciate
1. Parallel ( Relative to muscle direction
of pull)
(a) Quadrilateral- Quadratus
lumborum,Thyrohyoid
(b)Long and strap like- Sartorius
(c) Strap like with tendinous intersection
Rectus abdominis
(d ) Fusiform- Biceps brachii
2. Pennate muscles
(a) Unipennate ? Flexor Pollicis longus
(b)Bipennate- Rectus femoris, Dorsal
interossei of hand
(c )Multipennate - Deltoid
(d)Circumpennate- Tibialis anterior
Classification Of Muscles
3. Spiral
Supinator
4. Cruciate
Sternocledomastoid, Masseter
Classification Of Muscles
B. By Type Of Skeletal Muscle Fibre
1. Slow or Red fibres or type I fibres
2. Fast or White fibres or type II fibres
Classification Of Muscles
C. By Insertion near or away from joint
1. Shunt Muscle( Away from Joint )
2. Spurt Muscle ( Near Joint )
Nomenclature of Muscles
On Basis of :
1.Shape of muscle
Deltoid, Quadratus, Rhomboid, Lumbricals
2.Size
Major , minor , longus , brevis
3. Number Of Head
Biceps , triceps, Quadriceps femoris,
Digastric
Nomenclature
4. Position
Supraspinatus, Infraspinatus, Abdominis,
Oculi, oris
5.Depth
External oblique, Internal oblique
Flexor D. Superficialis, Flexor D.
Profundus
Nomenclature
6. Attachment : Sternocledomastoid,
coracobrachialis
7. Action : Flexor, Extensor, Abductor
Connective Tissue Wrappings of
Skeletal Muscle
? Endomysium ?
around single
muscle fiber
? Perimysium ?
around a
fascicle
(bundle) of
fibers
Figure 6.1
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.4a
Connective Tissue Wrappings of
Skeletal Muscle
? Epimysium ?
covers the
entire skeletal
muscle
? Fascia ? on the
outside of the
epimysium
Figure 6.1
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.4b
Skeletal Muscle Attachments
? Epimysium blends into a connective
tissue attachment
? Tendon ? cord-like structure
? Aponeuroses ? sheet-like structure
? Sites of muscle attachment
? Bones
? Cartilages
? Connective tissue coverings
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Slide 6.5
Function of Muscles
? Produce movement
? Maintain posture
? Stabilize joints
? Generate heat
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Slide 6.8
Microscopic Anatomy of Skeletal
Muscle
? Cells are multinucleate
? Nuclei are just beneath the sarcolemma
Figure 6.3a
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Slide 6.9a
Microscopic Anatomy of Skeletal
Muscle
? Sarcolemma ? specialized plasma
membrane
? Sarcoplasmic reticulum ? specialized
smooth endoplasmic reticulum
Figure 6.3a
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.9b
Microscopic Anatomy of Skeletal
Muscle
? Myofibril
? Bundles of myofilaments
? Myofibrils are aligned to give distrinct bands
? I band =
light band
? A band =
dark band
Figure 6.3b
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide
6.10a
Microscopic Anatomy of Skeletal
Muscle
? Sarcomere
? Contractile unit of a muscle fiber
Figure 6.3b
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide
6.10b
Microscopic Anatomy of Skeletal
Muscle
? Organization of the sarcomere
? Thick filaments = myosin filaments
? Composed of the protein myosin
? Has ATPase enzymes
Figure 6.3c
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide
6.11a
Microscopic Anatomy of Skeletal
Muscle
? Organization of the sarcomere
? Thin filaments = actin filaments
? Composed of the protein actin
Figure 6.3c
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide
6.11b
Microscopic Anatomy of Skeletal
Muscle
? Myosin filaments have heads
(extensions, or cross bridges)
? Myosin and
actin overlap
somewhat
Figure 6.3d
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide
6.12a
Nerve Stimulus to Muscles
? Skeletal
muscles must
be stimulated by
a nerve to
contract (motor
neruron)
? Motor unit
? One neuron
? Muscle cells
stimulated by
that neuron
Figure 6.4a
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.14
Muscle Response to Strong Stimuli
? Muscle force depends upon the number
of fibers stimulated
? More fibers contracting results in greater
muscle tension
? Muscles can continue to contract unless
they run out of energy
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Slide 6.22
Muscles and Body Movements
? Movement is
attained due to a
muscle moving
an attached
bone
Figure 6.12
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide
6.30a
Muscles and Body Movements
? Muscles are
attached to at
least two points
? Origin ?
attachment to a
immoveable bone
? Insertion ?
attachment to an
movable bone
Slide
6.30b
Types of Muscle Contractions
? Isotonic contractions
? Myofilaments are able to slide past each
other during contractions
? The muscle shortens
? Isometric contractions
? Tension in the muscles increases
? The muscle is unable to shorten
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.28
Muscle Tone
? Some fibers are contracted even in a
relaxed muscle
? Different fibers contract at different
times to provide muscle tone
? The process of stimulating various fibers
is under involuntary control
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.29
Effects of Exercise on Muscle
? Results of increased muscle use
? Increase in muscle size
? Increase in muscle strength
? Increase in muscle efficiency
? Muscle becomes more fatigue resistant
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Slide 6.31
Types of Ordinary Body
Movements
? Flexion ? decreases angle of joint and
brings two bones closer together
? Extension- opposite of flexion
? Rotation- movement of a bone in
longitudinal axis, shaking head "no"
? Abduction/Adduction (see slides)
? Circumduction (see slides)
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.32
Types of Muscles
? Prime mover ? muscle with the major
responsibility for a certain movement
? Antagonist ? muscle that opposes or
reverses a prime mover
? Synergist ? muscle that aids a prime
mover in a movement and helps prevent
rotation
? Fixators
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.35
Naming of Skeletal Muscles
? Direction of muscle fibers
? Example: rectus (straight)
? Relative size of the muscle
? Example: maximus (largest)
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide
6.36a
Naming of Skeletal Muscles
? Location of the muscle
?Example: many muscles are named
for bones (e.g., temporalis)
? Number of origins
?Example: triceps (three heads)
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Slide
6.36b
Naming of Skeletal Muscles
? Location of the muscles origin and
insertion
? Example: sterno (on the sternum)
? Shape of the muscle
? Example: deltoid (triangular)
? Action of the muscle
? Example: flexor and extensor (flexes or
extends a bone)
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.37
Smooth Muscle Characteristics
? Has no striations
? Spindle-shaped
cells
? Single nucleus
? Involuntary ? no
conscious control
? Found mainly in
the walls of hollow
organs
? Slow, sustained
and tireless
Figure 6.2a
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.6
Cardiac Muscle Characteristics
? Has striations
? Usually has a
single nucleus
? Joined to another
muscle cell at an
intercalated disc
? Involuntary
? Found only in the
heart
? Steady pace!
Figure 6.2b
Copyright ? 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slide 6.7
Disorders relating to the
Muscular System
? Muscular Dystrophy: inherited, muscle
enlarge due to increased fat and connective
tissue, but fibers degenerate and atrophy
? Duchenne MD: lacking a protein to
maintain the sarcolemma
? Myasthemia Gravis: progressive weakness
due to a shortage of acetylcholine receptors
Cardiac muscle tissue
intercalated disc
Eis, Jel?nek, Spacek, Histopatologick? atlas, Praha 2006
Abnormal contraction
? spasm ? involuntary contraction of one muscle
? cramp ? painful spasm
? tetanus ? multiple spasms of skeletal muscles
? tic ? involuntary twiches of muscles, usually under
voluntary control
? tremor ? rhythmical, involuntary contractions of opposite
groups of muscles
? fasciculations ? involuntary, short twiches on motor unit
visible under the skin
? fibrilace ? spontaneous contractions of fibres of one
muscle that aren?t visible under the skin
Special muscle structures I
? fascia (= perimysium externum)
? fibrous envelope of muscle or muscle group
? barrier for spreading of inflammation in that
specific area
? osteofascial septum (= septum
osteofasciale)
? fascial divider from the superficial fascia to
the periosteum
? separates the space for muscle groups ?
compartment (compartimentum)
https://www2.aofoundation.org/wps/portal/!ut/p/c0/
Growing old and musle tissue
? skeletal muscle tissue starts to be replaced
by fibrous and fatty tissue around the age of
30
? reflexes slowdown, loss of flexibility and
decrease of strength
? change of muscle fibres from quick to slow
Enthesopathy
? illness of muscle and tendinous insertions
? usually caused by repeated overstraining
? e.g. tennis elbow
http://www.fyzioterapie-stepankavojtova.cz/bolestivyloket.html
http://compex.zdravi-cz.eu/tenisovy-loket.php
? Select the trait that does not characterize
muscle tissue in general.
?
A)
irritability
?
B)
contractility
?
C)
extensibility
?
D)
All of these are traits of muscle.
? Individual fibers of skeletal muscle have
fine sheath of connective tissue called a(n)
________________.
?
A)
epimysium
?
B)
perimysium
?
C)
endomysium
?
D)
fascia
? Sarcomeres run from _________________.
?
A)
A band to A band
?
B)
Z line to Z line
?
C)
H zone to H zone
?
D)
I band to I band
? What muscle has its origin on the sternum
and inserts on the mastoid process of the
temporal bone?
?
A)
sternocleiodomastoid
?
B)
splenius capitis
?
C)
semispinalis capitis
?
D)
trapezius
? What is the deepest of the four abdominal
muscles?
?
A)
rectus abdominis
?
B)
external abdominal oblique
?
C)
transversus abdominis
?
D)
internal abdominal oblique
? The ______________ muscle is a deep,
lateral muscle of the forearm that flexes the
thumb joints and assists in grasping.
?
A)
flexor pollicis longus
?
B)
flexor carpi ulnaris
?
C)
superficial digital flexor
?
D)
deep digital flexor
? Which of these muscles is an adductor?
?
A)
gluteus medius
?
B)
tensor fascia lata
?
C)
pectineus
?
D)
iliacus
? Choose the muscle that does not belong to
the quadriceps femoris group of the anterior
thigh.
?
A)
rectus femoris
?
B)
vastus lateralis
?
C)
vastus medialis
?
D)
biceps femoris
? The thenar and hypothenar muscles are
located where?
?
A)
in the foot
?
B)
within the hand
?
C)
in the forearm
?
D)
in the lower leg
This post was last modified on 05 April 2022