Pectoral scapular regions
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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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Pectoral & Scapular Regions


...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 …

  • 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

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

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 !!

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

What should we know about each muscle ?

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

LAW:When the muscle perform its action, its insertion moves towards its origin.

Scapular Muscles((muscles connecting scapula to humerus))


Soulder Joint

The Scapula


Proximal end of Humerus bone


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)

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

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

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

Minor & Major


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..!!

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)

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))

Pectoral muscles

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

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)

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

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

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