-
Trapezius M:
action-
stabilizes, raises, retracts, and rotates the scapula
-
Trapezius M:
innervation-
spinoaccessory (XI) and ventral rami of C3, C4
-
Latissimus dorsi M:
action-
draws the shoulder downward and backward
-
Latissimus dorsi M:
innervation-
Thoracodorsal nerve (C6-C8)
-
Rhomboid major M:
action-
adducts, retracts, elevates, and rotates the scapula so that the glenoid cavity faces downward and stabilizes the scapula
-
Rhomboid major M:
innervation
dorsal scapular nerve (C5)
-
Levator scapulae M:
action-
raises scapula and draws it medially
-
Levator scapulae M:
innervation-
third and fourth cervical spinal nerves and dorsal scapular nerve (C3-C5)
-
Deltoid M:
action-
extends and laterally rotates the arm
-
Deltoid M:
innervation-
axillary nerve (C5, C6)
-
Teres major M:
action-
medially rotates, adductsm and extends the humerus
-
Teres major M:
innervation-
lower subscapular nerve (C6, C7)
-
Teres minor M:
action-
laterally rotates the arm and draws the humerus toward the glenoid cavity
-
Teres minor M:
innervation-
axillary nerve (C5)
-
Supraspinatus M:
action-
abducts the arm and acts to stabilize the humeral head in the glenoid cavity during movements of the shoulder joint
-
Supraspinatus M:
innervation-
suprascapular nerve (C5, C6)
-
Subcapularis M:
action-
medially rotates and stabilixes the head of the humerus in the glenoid cavity
-
Subcapularis M:
innervation-
upper and lower subscapular nerves (C5, C6)
-
Serratus anterior M:
action-
holds the scapula firmly against the thorax
-
Serratus anterior M:
innervation-
long thoratic nerve (C5-C7)
-
Serratus posterior inferior M:
action-
depresses last four ribs
-
Serratus posterior inferior M:
innervation-
the ninth through twelfth thoratic nerves (T7-T-12)
-
Splenius capitis M:
action-
extends and hyperextends the head
-
Splenius capitis M:
innervation-
dorsal rami of the middle cervical nerves (C4-C8)
-
Erector Spinae (or Sacrospinals) Group:
action-
-
Erector Spinae (or Sacrospinals) Group:
innervation-
-
Transverso-spinal Group:
action-
-
Transverso-spinal Group:
innervation-
-
Oblique capitis superior M:
action-
bends the head backward and laterally to the same side
-
Oblique capitis superior M:
innervation-
dorsal ramus of the first cervical (suboccipital) nerve (C1)
-
Rectus capitis posterior major M:
action-
extends and rotates the head toward the same side
-
Rectus capitis posterior major M:
innervation-
dorsal ramus of the suboccipital nerve (C1)
-
Gluteus maximus M:
action-
extends and laterally rotates thigh
-
Gluteus maximus M:
innervation-
inferior gluteal nerve (L5-S2)
-
Piriformis M:
action-
laterally rotates thigh at the hip joint and abducts thigh
-
Piriformis M:
innervation-
anterior rami of S1, S2
-
Gluteus medius M:
action-
extends and flexes hip
-
Gluteus medius M:
innervation-
superior gluteal nerve (L5, S1)
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