TRAPEZIUS

TRAPEZIUSmuscle's origin: base of triangle situated along vertebral column muscle's insertion: apex pointing toward tip of shoulder

ScapulaVertebral column

Occipital bone

IV. COMMITTEE LAB-2

TRAPEZIUSSuperior and inferior fibers work together to rotate the lateral aspect of the scapula upward, which needs to occur when raising the upper limb above the head.

IV. COMMITTEE LAB-2

TRAPEZIUSThe trapezius also braces the shoulders by pulling the scapulae posteriorly and superiorly, fixing them in position on the thoracic wall with tonic contraction; consequently, weakness of this muscle causes drooping of the shoulders.

IV. COMMITTEE LAB-2

TRAPEZIUSMotor innervation of trapezius accessory nerve [XI]descends from the neck onto the deep surface of the muscle. Proprioceptive fibers from trapezius pass in the branches of the cervical plexus and enter the spinal cord at spinal cord levels C3 &C4.

IV. COMMITTEE LAB-2

LATTISIUMUS DORSI• Spinous processes of T7 to

L5• Sacrum• Iliac crest• Ribs 10 to 12

Floor of intertubercular sulcus of humerus

IV. COMMITTEE LAB-2

LATTISIUMUS DORSIExtendAdduct humerus (arm,upper limb)Medially rotate

can also depress the shoulder, preventing its upward movement

Apley scratch test.

IV. COMMITTEE LAB-2

LATTISIUMUS DORSIIn combination with pectoralis major

powerful adductor of the humerus

plays a major role in downward rotation of the scapula in association with this movement.

IV. COMMITTEE LAB-2

LATTISIUMUS DORSIInnervation: thoracodorsal nerve

IV. COMMITTEE LAB-2

LEVATOR SCAPULAE

Upper portion medial

border of scapula

superior to root of spine of scapula

LEVATOR SCAPULAEacts with the descending part of the trapezius to elevate the scapula, or fix it! resists forces that would depress it, as when carrying

a load.

RHOMBOID MINORLower portion of ligamentum nuchae Spinous processes of C7 and T1

Medial border of scapula at the spine of scapula

RHOMBOID MAJORSpinous processes of T3 to T5Medial border of scapula between spine & inferior angle

IV. COMMITTEE LAB-2

RHOMBOID MAJOR ET MINORRetract (adduct) and elevate scapula

Assist serratus anterior in holding the scapula against the thoracic wall and fixing the scapula during movements of the upper limb.

IV. COMMITTEE LAB-2

Innervation: dorsal scapular nerve branch of brachial plexus

C4 & C5

IV. COMMITTEE LAB-2

SERRATUS POSTERIOR SUPERIORSERRATUS POSTERIOR INFERIOR

.attached to the vertebral column and associated structures mediallyEither descend (fibers of serratus posterior superior) or Ascend (fibers of serratus posterior inferior)

to attach to the ribs. These two muscles therefore elevate and depress the ribs

IV. COMMITTEE LAB-2

SERRATUS POSTERIOR SUPERIOR

SERRATUS POSTERIOR INFERIOR .first four intercostal spinel nerves

last four intercostal spinel nerves

IV. COMMITTEE LAB-2