muscles of the chest & back. muscles of scapular stabilization muscles of scapular stabilization...
TRANSCRIPT
MUSCLES OF THE CHEST & BACK
MUSCLES OF SCAPULAR STABILIZATION Trapezius Rhomboid major, minor Levator scapula Serratus anterior Pectoralis minor
Trapezius
O: Occiput & spines of C7, T1-T12
I: Clavicle (lateral 1/3 & acromion process) & spine of scapula
A: Elevates, retracts, depresses scapula
A: Extends neck when O/I switched
Trapezius – Spino, Acromio, clavotrapezius
Rhomboid Major, Minor
O: Spinous processes: minor- C7-T1; major T2-T5
I: Vertebral border of scapula
A: Retracts scapula
Rhomboid Minor, Major
Levator Scapula
O: Transverse processes C1-C4
I: Upper medial border of scapula
A: Elevates scapula A: Extends neck
whenO/I switched
Levator Scapula
Serratus Anterior
O: Ribs 1-8 I: Medial border of
scapula (costal side) A: Protracts scapula
Serratus Anterior
Pectoralis Minor
O: Ribs 3-5 I: Coracoid
process of scapula
A: Depression, protraction of scapula
Pectoralis Minor
Brachial Plexus
MUSCLES OF THEROTATOR CUFF
(MUSCULOTENDINOUS CUFF)
Supraspinatus Infraspinatus Teres minor Subscapularis
Rotator Cuff
Supraspinatus
O: Supraspinous fossa of scapula
I: Greater tubercle of humerus
A: Abducts arm
Infraspinatus
O: Infraspinous fossa of scapula
I: Greater tubercle of humerus
A: Adducts arm A: Laterally
rotates arm
Teres Minor O: Axillary border
of scapula I: Greater
tubercle of humerus
A: Laterally rotates armA
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Teres Minor
Subscapularis
O: Subscapular fossa of scapula
I: Lesser tubercle of humerus
A: Medially rotates arm
MUSCLES ACTING ON THE SHOULDER JOINT
Deltoid Pectoralis major Latissimus dorsi Teres major
Deltoid O: Lateral clavicle,
spine of scapula I: Deltoid tuberosity
of humerus A: Abducts arm A: Ant. Fibers:
flexes/ medially rotates arm
A: Post. Fibers: extends/ laterally rotates arm
Deltoid – Spino, acromio, clavodeltoid
Pectoralis major
O- Medial clavicle, sternum, costal cartilages of ribs
I- Intertubercular groove of humerus
A- Adducts, medially rotates arm
Pectoralis major
Latissimus dorsi
O: Spines of lower thoracic & lumbar vertebrae, iliac crest
I: Intertuberculargroove of humerus
A: Extends, adducts, medially rotates arm
Latissimus dorsi
Teres major
O- Axillary border of scapula
I- Intertubercular groove of humerus
A- Adducts, medially rotates, extends arm
Teres Major
DEEP MUSCLES OF THE BACK
1) Erector Spinae 2) Iliocostalis 3) Longissimus 4) Spinalis 5) Splenius
– Cervicis & Capitus