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Transcript 
TRAPEZIUS
It is a large flat 
triangular muscle.
Origin : 
1. Occipital bone 
(a) medial third of
superior nuchal
line.
(b) external 
occipital
protuberance.

TRAPEZIUS
2. Ligamentum 
nuchae.
3. Spines of 
vertebrae :
C7. 
All thoracic. 
4. Supraspinous 
ligaments.
TRAPEZIUS
Insertion : 
1. Upper fibers : 
Lateral 1/3 of the
clavicle.
2. Middle fibers : 
Acromion and upper
border of the spine of
the scapula.
3.Lower fibers : 
Medial end of the spine
of the scapula.

TRAPEZIUS
Nerve supply : 
1. Spinal part of
the acessory
nerve (11th
cranial).
2.Sensory 
(proprioceptive)
from C3 & 4.

TRAPEZIUS
Action : 
1. Upper fibers : 
Elevate the scapula. 
2. Middle fibers : 
Retract and pull the 
scapula medially.
3.Lower fibers : 
Pull the medial border
of the scapula
downwards so the
glenoid cavity faces
upward and forward.

TRAPEZIUS
Action : 
The upper and 
lower fibers
together :
1. Rotate the 
scapula (with
serratus
anterior).
2. Extend the 
head and neck.
LATISSMUS DORSI
Origin : 
1.Posterior part of 
iliac crest.
2. Spines of the 
lower six thoracic
vertebrae.
3. Lower three or 
four ribs.
4. Inferior angle of 
the scapula.
LATISSMUS DORSI
It passes around the
lower border of
teres major (they
have a triple
relation).
Insertion : 
Floor of the bicipital
groove of the
humerus


LATISSMUS DORSI
Nerve supply : 
Thoracodorsal 
nerve.
Action : 
1. Extension. 
2. Adduction. 
3. Medial 
rotation.
of the arm. 
LEVATOR SCAPULAE
Origin : 
Transverse processes 
of the upper (4)
cervical vertebrae.
Insertion : 
Medial border of the 
scapula (opposite
supraspinous fossa).
RHOMBOID MINOR
Origin : 
1. Lower part of 
ligamentum nuchae.
2. Spines of C7 &T1. 
Insertion : 
Medial border of the 
scapula (opposite root
of the spine).
RHOMBOID MAJOR
Origin : 
A. Spines of (T2-5). 
B. Supraspinous 
ligaments.
Insertion : 
Medial border of the 
scapula (opposite
infraspinous fossa).
NERVE SUPPLY
Dorsal scapular
nerve supplies
the Rhomboids
and the Levator
scapulae.
Levator has 
another supply
from C3&4.

ACTION
1. Elevation of the
scapula (medial
border).
2. Acting together and
with the middle fibers of
trapezius, they pull the
scapula upwards and
medially and brace the
shoulder backwards
(Retraction)
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