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Glossary of Anatomy, Muscles of Thorax 1

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Trapezius
Extends head

Raises or lowers shoulders (scapula) and shrugs them
Pectoralis Minor
Pulls shoulder down and forward
Pectoralis Major
Flexes upper arm

Adducts upper arm anteriorly; draws it across chest
Latissimus Dorsi
Extends upper arm

Adducts, and medially rotates upper arm
Deltoid
Abducts upper arm

Assists in flexion and extension of upper arm
Supraspinatus
Assists in abducting the arm
Infraspinatus
Extends and laterally rotates arm
Teres Major
Adducts, extends and medially rotates arm
Teres Minor
Adducts and laterally rotates arm
Levator Scapula
Elevates and retracts scapula
Rhomboids
1-Major

2-Minor
1-Retracts, rotates and fixes scapula

2-Retracts, rotates, fixes and slightly elevates scapula
Serratus Anterior
Rotates and protracts scapula; elevates ribs
Subscapularis
Extends and medially rotates arm
Erector Spinae
(Divides into 3 columns)
Illiocostalis
Longissimus
Spinalis
Extends vertebral column
Illiocostalis
1-Cervicis

2-Thoracis

3-Lumborum
1,2,3- Extends, abducts, and rotates vertebral column
Longissimus
1-Capitis

2-Cervicis

3-Thoracis
1-Extends Head

2-Extends neck

3-Extends vertebral column
Spinalis
1-Cervicis

2- Thoracis
1-Extends neck

2- Extends vertebral column
Diaphragm
Inspiration,
depress floor of thorax
Intercostals
External
Inspiration;
elevates ribs
Intercostals
Internal
Expiration;
depresses ribs
Rectus Abdominus
Flexes vertebral column;
depresses thorax;
compresses abdomen
External Abdominal Oblique
Flexes and rotates vertebral column;
compresses abdomen,
depresses thorax
Internal Abdominal Oblique
Flexes and rotates vertebral column;
compresses abdomen,
depresses thorax
Transversus Abdominus
Compresses abdomen
Quadratus Lumborum
Abducts vertebral column and depresses twelfth rib

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