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Pectoral region
Lecture 2
Spring 2016 Dr. Maher Hadidi, University of Jordan 2
Muscle Action
Each muscle has:
Origin Beginning.
Insertion End.
Body (belly).
Law:
When a muscle
performs its action,
its insertion, moves
towards its origin.
Spring 2016
Dr. Maher Hadidi, University of Jordan
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Pectoral Region
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Pectoral RegionBreast region.
Contents:1. Skin.
2. Superficial fascia.
3. Breast.
4. Deep fascia.
5. 3 Muscles:a. Pectoralis major.
b. Pectoralis minor.
c. Subclavius.
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Pectoralis
major
Origin: Clavicle (M ½) , Sternum and upper 6 ribs. Insertion: humerus, lateral lip of intertubercular groove. Nerve Supply: Medial & lateral pectoral nerves. Action: Adducts and medially rotate the arm.
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Pectoralis
Minor
O: 3rd, 4th, 5th ribs.
Ins: Coracoid process.
NS: Medial pectoral N.
Action: Depress scapula downward and forward.
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Subclavius
Origin: 1st rib. Ins: Clavicle inferior surface. NS: N. to Subclavius. Action: Protects the underlying structures.
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Clavipectoral fascia
A sheet of CT that connects clavicle to the floor of the axilla.
It enclose subclavius and pectoralis minor and seals the gap between them.
Pierced by:
• Thoracoacromial A.
• Cephalic vein.
• Lateral pectoral N.
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Muscles connecting UL to vertebral col.
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DeltoidO: Clavicle, acromion and
spine of scapula.
Ins: Deltoid tuberosity.
Action: Its fibers runs in 3
directions
• Ant. flex shoulder.
• Post. extend should.
• Middle Abduct arm 15-900.
NS: Axillary N.
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TrapeziusO: Skull, spines of C1-T12 v.
Ins: Its fibers runs in 3
directions
• Down Clavicle.
• Horizontal Acromion.
• Up Spine of scapula.
Action:
Upper F. Elevate arm.
Middle F. adduct medial
Lower F. pull downward
Assist the serratus anterior muscle in abducting the arm 1800 above the head.
NS: Spinal accessory (IX) N.
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Latissmus dorsiO: T7-T12, L1- L5,
Sacrum & Iliac crest.
Ins: Floor of biceptal
groove
Action: extends, adducts
and medially rotate
humerus like in
canoeing.
NS: Thoracodorsal N.Dr. Maher Hadidi
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Scapular
musclesLecture 3
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Muscles connecting UL to scapula
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SupraspinatusO: Supraspinous fossa.
Ins: Greater tubercle of
humerus.
Action: Abducts arm
0-150.
NS: Suprascapular N.
InfraspinatusO: Infraspinous fossa.
Ins: Greater tubercle.
Action: Lateral rotation
of arm.
NS: Suprascapular N.
S
i
T
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Teres Minor(L. Rounded)
O: Lat. border of Scapula.
Ins: Greater tubercle.
Action: Lateral rotation of
arm.
NS: Axillary n.
Teres MajorO: Lat. border of Scapula.
Ins: Medial lip of i.t groove
Action: Adduction & Medial
rotation and of arm.
NS: Lower subscapular n.
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Subscapularis
Origin: Subscapular
fossa.
Ins: Lesser tubercle.
Action: Medial rotation
of the arm.
NS: Upper and lower
subscapular Ns.
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Serratus anterior Origin: upper 8 ribs.
Ins: Medial border of
scapula.
Act: Protraction of
scapula (pulls scapula forward over thoracic wall).
It assists trapezius to elevate arm 1800
above shoulder.
NS: Long thoracic N.
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Rotator cuff muscles of shoulder
Form of 4 muscles:
Supraspinatus
Infraspinatus
Teres minor
Subscapularis Their tendons flatten at
their insertion and blend with the capsule of the shoulder joint. They act as a handcuff that strengthen shoulder joint (superior,
posterior & anterior).
But NOT inferior?
Si
T
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Spaces between scapular muscles
Quadrangular space Borders:
• Sup. T. minor • Inf. T. major• Med. Triceps, long h.• Lat. humerus
Contents:• Axillary N.• Post. circ. hum. A,V.
Triangular space
Borders:• Sup, T. minor• Inf, T. major• Lat. Triceps, long head
Contents:• Circumflex scapular A & V.
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