pectoral scapular regions n.
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Pectoral & Scapular Regions. Anatomy. ... Before we start. شيت VS كتاب علم VS علامة. What is Muscle ?. A contractile organ consisting of a special bundle of muscle tissue, which moves a particular bone, part, or substance of the body. Types of muscles ….

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before we start
...Before we start
  • شيت VS كتاب
  • علم VS علامة
what is muscle
What is Muscle ?
  • A contractile organ consisting of a special bundle of muscle tissue, which moves a particular bone, part, or substance of the body.
types of muscles
Types of muscles …
  • Skeletal muscles : a form of striated muscles attached to bones by tendons and they under control of somatic nervous system ((voluntary controlled))...existing throughout the human body.
  • Smooth muscles : Non striated muscles and they under control of autonomic nervous system ((involuntary controlled))… existing in  wall of blood vessels ,lymphatic vessels, the urinary bladder , male and female reproductive system, gastrointestinal tract, respiratory tract..etc.
  • Cardiac muscles :striated muscles controlled by the autonomic nervous system ((involuntary controlled)).. Found only in the walls of the heart.
functions of skeletal muscles
Functions of skeletal muscles

.1. Movement((وضعية الجسم2. Posture ((.3. Support & protection4. Heat regulation.

how muscles are named
How muscles are named !

1.Size of muscles : minor , major2.Shape of muscles: Deltoid ,Teres3.Main action: Flexor,Extensor4.Number of tendons of origin :Bicecps,Triceps

5.Relation of muscle to the bone : Supraspinatus,Infraspinatus6.Origin &insertion : Brachioradialis (from Brachium(humerus) to radius)

i should memorize all these muscles
I should memorize all these muscles !!

Scapular regions :SupraspinatusInfraspinatusTeres minorTeres major SubscapularisDeltoid Pectoral regions :Pectoralis major Perctoralis minorSubclaviusSerratusantreior

what should we know about each muscle
What should we know about each muscle ?

1.Origin 2.Insertion 3.Nerve Supply 4.Action



Soulder Joint

The Scapula



Proximal end of Humerus bone


supraspinatus supra above spintaus spine of scapula
Supraspinatus (Supra=above .. -spintaus =spine of scapula

Origin :Supraspinousfossa of scapula

Insertion: Greater tuberosity of humerus

Nerve supply: Suprascapular nerve


(1-Initiation of abduction (0-15 degree2-stabilization of the shoulder joint

infraspinatus infra below spinatus spine of scapula
Infraspinatus (infra=below,-spinatus= spine of scapula)

Origin: Infraspinousfossa of scapula

Insertion: Greater tuberosity of humerus

Nerve supply:Suprascapular nerve


1- Lateral rotation 2- Stabilization of shoulder joint

teres rounded teres minor
(teres=rounded)Teres minor

Origin: Upper two thirds of lateral border of scapula

Insertion: Greater tuberosity of humerus

Nerve supply: Axillary nerve


1- Lateral rotation 2- stabilization of shoulder joint

teres major
Teres major

Origin: Lower third of lateral border of scapula

Insertion: Medial lip of intertubercular groove of humerus

Nerve supply : Lower subscapular nerve


1-Medial rotation 2-adduction 3-stabilization of shoulder joint


Origin: Subscapularfossa

Insertion: Lesser tuberosity of humerus

Nerve supply: Upper and lower

subscapular nerve


1-Medial rotation 2-stabilization of shoulder joint

rotator cuff of shoulder joint
Rotator cuff of shoulder joint..!!

4 muscles and their tendons :Supraspinatus (superior)posterior )) InfraspinatusTeres minor (posterior)(Anterior)Subscapularis Function: maintaining glenohumeral (shoulder joint) stability.Note: The cuff is deficient inferiorly, and this is a site of potential weakness.

deltoid muscle delt triangular oid like
Deltoid muscle (delt= triangular,oid=like)

Origin: 1-anterior border & upper surface of lateral third of the clavicle 2- lateral margin of acromion 3-posteroir border of the spineInsertion: Deltoid tuberosity of humerusNerve supply: Axillary nerveAction: 1- Abduction (15-90 degrees) 2- Flexion ((Calvicular fiber)) 3- Extension((Posterior fibers))

pectoralis major pector breast
Pectoralis major (pector=Breast)

Origin: 1-medial half (sternal Half) of Clavicle 2- Anterior surface of SternumInsertion: Lateral Lip of intertubercular headNerve supply : Medial & Lateral pectoral nervesAction : 1-Adduction 2-Medial rotation

pectoralis minor
Pectoralis minor

Beneath pectoralis majorAnterior surface & superior border of ribs III to V:OriginInsertion: coracoid process of scapulamedial pectoral nerve:Nerve supplyAction: Depression of shoulder joint

subclavius sub under clavius clavicle
Subclavius (sub=under,clavius=clavicle)

Origin :Rib IInsertion: groove at the middle third of inferior surface of clavicleNerve Supply: nerve to subcalviusAction:1- pulls clavicle medially 2-protects underlying structures

serratus anterior serratus saw anterior front side of body
Serratusanterior(serratus=saw,anterior=front side of body)

Origin: lateral surface of upper 9 ribsInsertion: medial border the scapulaNerve supply : long thoracic nerve Action: protraction &rotation of scapula