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MUSCLES OF THE BACK'
TRAPESIUS
UPPER FIBERS
O I -
External occipital proturbance and spinous process of 7th cervical vertebrae.
LATERAL 1/3 OF CLAVICLE AND ACROMION PROCESS.
MIDDLE FIBRES
OI -
SPINOUS PROCESSES OF 1ST THROUGH 5TH THORACIC VERTEBRAE
SUPERIOR LIP OF SPINE OF SCAPULA
LOWER FIBRES
OI-
SPINOUS PROCESSES OF 6TH THROUGH 12TH THORACIC VERTEBRAE
APEX OF SPINE OF SCAPULA
ACTION
UPPER FIBERS MIDDLE FIBRES LOWER FIBRES N.S. -
ELEVATE THE SCAPULA, LATERALLY FLEX THE NECK.
ADDUCTS THE SCAPULA.
DEPRESSES AND ADDUCTS THE SCAPULA.
CERVICAL PLEXUS.
Trapesius
Latissimus Dorsi
LATISSIMUS DORSI
O -
I A.C. -
N.S. -
SPINOUS PROCESS OF LAST 6 THORACIC VERTEBRAE,LAST 3/4 RIBS LUMBAR VERTEBRAE, MEDIAN
RIDGE OF SACRUM AND POSTERIOR 1/3 OF LIP OF ILLIAC CREST, A SLIP FROM THE INFERIOR ANGLE
OF THE SCAPULA.
THE BICIPITAL GROOVE OF THE HUMERUS
DRAWS ELEVATED ARM BACK AND OBLIQUELY DOWN, EXTENDS, ADDUCTS AND ROTATES ARM
MEDIALLY.
THORACODORSAL ( LONG SUB-SCAPULARIS )
Frances Daly MSc
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SECOND LAYER
LAVATOR SCAPULAE
O -
TRANSVERSE PROCESS OF FIRST 4 CERVICAL VERTEBRAE.
I -
MEDIAL BORDER OF SCAPULAE BETWEEN SUPERIOR ANGLE AND ROOT OF SPINE.
A.C. -
ELEVATES THE SCAPULA, ASSISTS IN LATERAL FLEXION AND ROTATION OF THE NECK TO THE SAME
SIDE.
N.S. -
CERVICAL PLEXUS 5TH, (DORSAL SCAPULAR)
Lavator Scapula
Rhomboid Muscles Major/ minor
RHOMBOID MAJOR
O I -
S. P. OF 2ND - 5TH THORACIC VERTEBRAE.
TO THE MEDIAL BORDER OF SCAPULA BETWEEN SPINE AND INFERIOR ANGLE.
RHOMBOID MINOR
O -
S.P. OF 7TH CERVICAL AND 1ST THORACIC VERTEBRAE.
I -
MEDIAL BORDER OF SPINE OF SCAPULA.
A.C. -
R.MAJ. & R. MIN. ADDUCTS AND ELEVATES THE SCAPULA.
N.S. -
-5THCERVICAL (DORSAL SCAPULA )
ERECTOR SPINAE ( SACRO - SPINALIS )
THIS MUSCLE EXTENDS THE WHOLE LENGTH OF THE SPINAL COLUMB OCCUPYING THE GROOVE BETWEEN SPINE AND RIBS
IT HAS NUMEROUS ORIGINS AND INSERTIONS.
A.C. N.S. -
KEEPS THE SPINE ERECT,EXTENDS THE SPINE, ACTION ON ONE SIDE ONLY, CAUSES LATERAL FLEXION OF THE TRUNK.
POSTERIOR DEVISION OF SPINAL NERVES.
THE THREE MAIN DEVISIONS OF THIS MUSCLE ARE ILIOCOSTALIS,
Frances Daly MSc.
LONGISSIMUS, SPINALIS.
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SUPRASPINATUS
O -
MEDIAL 2/3 OF SUPRASPINOUS FOSSA OF THE SCAPULA
I -
GREATER TUBEROSITY OF HUMERUS AND SHOULDER JOINT CAPSULE
A.C. -
ABDUCTS THE ARM AND ASSISTS OUTWARD ROTATION.
N.S. -
SUPRASCAPULAR.
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INFRASPINATUS
O -
MEDIAL 2/3 OF FOSSA BELOW SPINE OF SCAPULA.
I -
GREATER TUBEROSITY OF HUMERUS AND SHOULDER
JOINT CAPSULE
A.C. -
LATERALLY ROTATES THE SHOULDER JOINT.
N.S. -
SUPRASCAPULAR.
Supraspinatus
Infraspinatus
LATERAL THORACIC REGION
SERRATUS ANTERIOR
O -
ANTERIOR SURFACE AND SUPERIOR BORDERS OF 8 OR 9 RIBS
I -
COSTAL SURFACE OF MEDIAL BORDER OF SCAPULA.
A.C. -
ABDUCTS THE SCAPULA, AND HOLDS THE MEDIAL BORDER
OF THE SCAPULA AGAINST THE THORAX.
N.S. -
LONG THORACIC.
Frances Daly MSc.
Teres Major
O I A.C.
N.S.
Dorsal surface of inferior angle of the scapula on lower 1/3 of scapular axillary
border.
Crest of lesser tubercle of humerus
Adducts and medially rotates and extends the shoulder joint.
Lower Subscapular,C6,7
TeresMinor
O. I. A.C. N.S. -
Superior surface of dorsal surface of axillary border of scapula.
Lower facet of greater tubercle of humerus and shoulder joint capsule.
Lateral rotation of humerus at the shoulder.
Axilllary C 6.7
Teres Major / Minor
Subscaplaris
O - Entire Anterior surface of the subscapular fossa.
I. Lesser tubercle of humerus ans capsule of shoulder joint.
A.C. - Medial rotation of the humerus at the shoulder joint.
N.S - Lower Subscapular C5,6,7.
Frances Daly MSc.
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