Download 1. Where is the pectoral region?

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The pectoral region is external to the
anterior thoracic wall and anchors the upper
limb to the trunk.
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Superficial compartment
Contains skin, superficial fascia, breasts
Deep compartment
Contains muscles & associated structures
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Four pectoral muscles move the pectoral girdle
Pectoralis major
Pectoralis minor
Serratus anterior
Subclavius
Clavicular head: Medial half of clavicle
Medial process
border of
Coracoid
of
scapula
scapula
Stabilizes
Lateral
lip of
scapula
3rd-5thand
ribs near
Adducts
intertubercular sulcus of
their costal
medially
humerus
Protracts
cartilages & rotates
rotates
Lateral parts of
scapula
humerus
1st-8th ribs
Sternocostal head:
Anterior surface of
sternum, superior six
costal cartilages,
aponeurosis of external
oblique muscle
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Serratus anterior
Pectoralis major
Pectoralis
minor
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Pectoralis major
powerful adduction
medial rotation of the arm
clavicular
head flexing
the humerus
sternocostal
head extending
it back
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Pectoralis minor
stabilizes the scapula
touch an object that is just out of reach.
Assists in elevating the ribs
Subclavius
Anchors and depresses the clavicle, stabilizing
it during movements of the upper limb.
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one of the most powerful muscles
of the pectoral girdle
 Strong protractor of scapula –Abduction
 used when punching or reaching anteriorly(boxer's
muscle).
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Pectoralis major Medial & Lateral pectoral nerves
Pectoralis minor Medial pectoral nerve
Subclavius
Nerve to subclavius
Serratus anterior Long thoracic nerve
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Deep to the pectoral
fascia & pectoralis major
Descends from the
clavicle
Clavipectoral
triangle
cephalic vein can
be found.
formed by
pectoralis major,
deltoid & clavicle
Deltopectoral groove
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In the subcutaneous
tissue overlying the
pectoralis major and
minor muscles.
lateral border of the
sternum to the
midaxillary line
vertically from the
2nd through 6th ribs.
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PECTORALIS MAJOR
clavicular head of pectoralis major
arm is abducted 90°; the individual then moves the arm anteriorly against resistance.
If acting normally, the clavicular head can be seen and palpated.
sternocostal head of the pectoralis major
arm is abducted 60° and then adducted against resistance.
If acting normally, the sternocostal head can be seen and palpated.
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SERRATUS ANTERIOR
fxn of long thoracic nerve
Hand of the outstretched limb is pushed against a wall.
If the muscle is acting normally, several digitations of the muscle can be seen
and palpated
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