Set%205%20Muscles%20Superficial%20Power%20Muscles%20of%20the%20Torso

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Set 5 MusclesSuperficial Power Muscles of the
Torso
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Lumbodorsal Fascia
3
Lumbodorsal fascia

• Origin
• Insertion
• Action

coccyx up past T10
point of half diamond ends up around L3-L4 area
increases surface area for attachment of large
muscles
4
Latissimus dorsipower-stroke muscle
5
Latissimus dorsi

• Origin
• Insertion
• Action

Spinous processes of sacral, lumbar and lower
thoracic vertebrae (T7-L5) iliac crest (pelvis)
lower ribs (9-12)
Intertubercular grove of humerus (twist around
teres major)
Powerfully extends and adducts arm and rotates
humerus inwardly or pulls shoulder downward and
posteriorly
6
Intertubercular groove
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Pectoralis major pledge of allegiance muscle
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Pectoralis major pars abdominalis
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Pectoralis major pars abdominalis

• Origin
• Insertion
• Action

aponeurosis of external obliques over medial
part of ribs 5-7
lateral ridge of intertubercular groove of humerus
adducts shoulder, rotates medially and extends
(last part of tennis or volleyball serve)
10
Pectoralis major pars sternocostalis
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Pectoralis major pars sternocostalis

• Origin
• Insertion
• Action

anterior surface of sternum and costal cartilage
of ribs 1-7
lateral ridge of intertubercular groove of humerus
adducts the arm across chest and pulls shoulder
forward (tennis forehand)
12
Pectoralis major pars clavicularis
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Pectoralis major pars clavicularis

• Origin
• Insertion
• Action

sternal half of clavicle
lateral ridge of intertubercular groove of humerus
adducts the arm upward toward the face (last part
of bowling or uppercut in boxing)
14
Trapezius pars spinalis(lower division)sexy
shoulder muscle
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Trapezius pars spinalis (lower division)

• Origin
• Insertion
• Action

Spinous process of T4-T12 vertebrae
posterior portion of the spine of scapula
Power muscle that pulls scapula back and medially
rotates
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Trapezius pars acromialis(middle
division)sexy shoulder muscle
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Trapezius pars acromialis (middle division)

• Origin
• Insertion
• Action

lower end of the nuchal ligament, spinous
processes of C6-T3 vertebrae
medial margin of the acromial process and the
distal end of the scapular spine
Power muscle that lifts the shoulder upward and
back
18
Trapezius pars clavicularis(upper
division)sexy shoulder muscle
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Trapezius pars clavicularis (upper division)

• Origin
• Insertion
• Action

begins at the superior part of nuchal ligament
from the occipital bone and continues along the
nuchal ligament to C6 vertebrae
superior border of the last lateral third of the
clavicle
elevates scapula and helps rotate arm upward
(supports weight of arm)
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Trapeziussexy shoulder muscle
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Nuchal Ligament