Deltoid vs Pectoralis major

Özellik	Deltoid	Pectoralis major
Latince Adı	Musculus deltoideus	Musculus pectoralis major
Tür	Muscle	Muscle
Vücut Sistemi	Muscular	Muscular
Vücut Bölgesi	Shoulder	Thorax
İşlev	The primary abductor of the shoulder joint. The anterior fibers flex and medially rotate the arm. The posterior fibers extend and laterally rotate the arm. Gives the shoulder its rounded …	A powerful adductor, flexor, and medial rotator of the arm at the shoulder. Essential for pushing movements, climbing, and arm-swinging activities.
Klinik Önemi	Deltoid paralysis from axillary nerve injury prevents arm abduction. The deltoid is a common site for intramuscular injections. Rotator cuff tears may cause compensatory deltoid overuse.	Pectoralis major rupture occurs during heavy bench pressing. Poland syndrome involves congenital absence of the pectoralis major. The muscle is used in pectoralis major flap reconstructive surgery.
FMA ID	32521	9627

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Full structure pages

Deltoid

Musculus deltoideus

Thick and triangular, the deltoid caps the shoulder joint and gives the shoulder its rounded contour. It is the primary abductor of the joint; its anterior fibers flex and medially rotate the arm, while its …

Muscular Shoulder

Pectoralis major

Musculus pectoralis major

A fan-shaped muscle of the anterior chest wall, the pectoralis major acts as a powerful adductor, flexor, and medial rotator of the arm at the shoulder, and is essential to pushing movements, climbing, and arm-swinging …

Muscular Thorax