Built?
A.
Moves bones and substances
(blood, waste, nutrients)
A. Skeletal
B. Smooth (hollow organs)
C. Cardiac (heart wall only)
A. Skeletal
(40% body
mass)
1. Longest
muscle fiber,
multi nucleate,
striations
B. Smooth
C. Cardiac
A. Microscopic Muscle cell or
fiber
1. Each muscle fiber (cell) contains
2 myofibrils, actin and myosin
(elastic filaments)
6 actins to 1 myosin
2. Outside of muscle cell
Each compartment here is a
muscle cell or muscle fiber
a. Myofibrils, Myosin and Actin
B. Parts of neuromuscular
junction
1. Location
2. Shape
3. Relative Size
4. Direction of Fibers
5. Number & Location of Origins
6. Action of Muscle
B. Four Functional roles
1. Prime mover-agonist primary
movement
2. Antagonist- opposes prime
mover
3. Synergist – assists prime mover
4. Fixator- holds muscle at origin
C. Gross Skeletal Muscle
composition, Layers
1. Fascia is outside Epimysium. It allows
space for blood vessels and nerves
and forms part of tendon.
2. Epimysium is areolar connective
3. Fascicle is surrounded by a dense
connective tissue sheath of
perimysuim.
4. Each muscle fiber (cell) is
surrounded by an reticular
connective sheath of endomysium
D. Individual Muscles
1. Face
a. SCM
b. masseteur
c. frontalis
d. occipitalis
e. temporalis
d. obicularis
oris & occuli
e. zygomaticus
Facial expression
attached to skin
2. neck
3. Shoulder arm (front), scapula, Lats
4. Abdomen
5. Back
6. Lower arm
7. Upper leg
8. Lower leg
E. Origins and Insertions
1. Origin is where a muscle begins, its
origin. It is the less moveable end.
2. Insertion is where the muscle inserts
or leads to from its origin. It is the
moveable end.
3. They will be studied for major
muscles.
4. They are easier to remember seeing a
picture of what the muscle looks like
Muscle Origin
a.Masseter zygomatic
arch
Insertion
mandibular
ramus
b.SCM clavicle& manubrium
mastoid process
Movement
Close mouth
flex neck, rotate
head
c.Biceps coracoid P, radial tuberosity
flex forearm
capsule of
shoulder joint
d.Triceps glenoid cavity olecron process extend forearm
pos. humerus
pos. humerus radial groove
e.Deltoid 1/3 clavicle, deltoid tuberosity
acromion P of humerus
scapular spine
abduction of arm
Muscle
Origin
f.Pec major clavicle,
sternum ribs
1-6
g.Trapezius occipital
C7- T12
Insertion
Movement
intertubercular shoulders
groove of
forward
humerus
lat 1/3 clavicle shrug shoulders
acromion
spinous pro
of scapula
h.Latissimus spinous
P of T6-L5
8-12 ribs, illiac
crest
floor of
intertubercular
groove of
humerus
chop wood
i.Rectus inferior illiac tibial tuberostiy extend knee,
Femoris spine
patella
flex thigh
Muscle
Origin
Insertion
Movement
j. Biceps Ischial tuberosity lateral condyl extend thigh
Femoris linea aspera
of tibia
flex knee
distal femur
head of fibula
k.Gluteus dorsal ilium IT tract
abduct thigh
Maximus sacrum,
gluteal tuberosity climb stairs
coccyx
of femur
l.Gastroc medial & lateral calcaneal tendon plantar
condyles of femur
flexion