| MUSCLE |
ORIGIN |
INSERTION |
ACTION |
INNERVATION |
| trapezius |
superior nuchal line
of occipital bone
nuchal ligament
spines of 7th &
all thoracic vertebrae |
lateral third of clavicle
median margin of
acromion
scapular spine |
elevates shoulder
laterally rotates scapula
retracts scapula on thoracic wall |
spinal accessory n. |
| latissimus dorsi |
spinous processes of lower thoracic vertebrae
lumbodorsal fascia
crest of ilium |
floor of intertubercular
groove of humerus |
adducts, extends, medially rotates arm |
thoracodorsal n. |
| rhomboid major |
spinous processes of 2nd thru
5th thoracic
vertebrae |
medial border of scapula
below root of scapular
spine |
retracts and medially rotates scapula |
dorsal scapular n. |
| rhomboid minor |
spine of 7th cervical
and 1st thoracic vertebrae
lower part of nuchal ligament |
medial margin of scapula
at the root of the
scapular spine |
retracts and medially rotates scapula |
dorsal scapular n. |
| levator scapulae |
transverse processes of C1-C4 |
medial border of scapula
above root of scapular
spine |
raises scapula |
dorsal scapular n. |
| supraspinous |
supraspinous fossa of scapula |
superior aspect of
greater tubercle of humerus |
abducts the arm (1st 15 degrees) |
suprascapular n. |
| infraspinous |
infraspinous fossa of scapula |
mid portion of
greater tubercle of
humerus |
rotates the arm laterally |
suprascapular n. |
| teres minor |
lateral border of scapula |
lower aspect of greater tubercle of humerus |
rotates arm laterally |
axillary n. |
| teres major |
inferior medial border of scapula |
crest of lesser tubercle of humerus |
adducts and rotates arm medially |
lower subscapular n. |
| deltoid |
lateral third of clavicle
acromion process
scapular spine |
deltoid tuberosity of humerus |
abduction of arm from 15 degrees to 90 degrees |
axillary n. |
| triceps, long head |
infraglenoid tubercle of scapula |
olecranon process of ulna |
extends arm and forearm |
radial n. |
