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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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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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Nipple
surrounded by a circular pigmented area of
skin, areola (L. small area)
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Axillary process or tail (of Spence)
The mammary gland is firmly
attached to the dermis of the
A series of ducts
andespecially
associated by
overlying
skin,
secretory lobules.
These
converge
substantial
skin
ligaments
to form
15 to 20 lactiferous
(L.
retinacula
cutis), ducts,
suspensory
ligaments (of
which open independently
onto the
Cooper).
nipple.
help support the lobes and
lobules of the mammary gland.
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Rudimentary and consists only of small ducts, often
composed of cords of cells, that normally do not extend
beyond the areola.
Breast cancer can occur in men.
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