Levator scapulae is a posterior Axio-appenducular muscle that connects the top limb to the vertebral column and also lies in the posterior triangle the the neck. The superior facet of the levator scapulae is covered by sternocleidomastoid, and its inferior component by trapezius.
You are watching: Unilateral contraction of which muscle causes ipsilateral flexion of the lumbar vertebral column?
The levator scapulae originates top top the posterior tubercle of transverse procedure of cervical vertebrae 1 to 4.<2>
The levator scapulae inserts on to the vertebral margin that the scapula between the premium angle and the root of the spine.<3>
The superior 3rd of the strap-like levator scapulae lies deep to the sternocleidomastoid while the inferior 3rd is deep come the trapezius. Native the transverse procedures of the upper cervical vertebrae, the fibers of the levator that the scapula pass inferiorly to the superomedial border of the scapula.<1>
The levator scapulae is innervated by cervical nerve (C3-C4) and also dorsal scapular nerve (C5).<4>
Descending scapular artery<5>
The levator scapulae functions to elevate the scapula and also tilt the glenoid cavity inferiorly by rotating the scapula downward. <6>
If the scapula is fixed, a contraction of the levator scapulae leader to the lateral flexion the the cervical vertebral obelisk to the side and stabilizes the vertebral column throughout rotation.
Forward head posture puts raised tension top top the levator scapulae muscle to co-contract because that cervical extension in an elongated position.<7> enhanced tightness in the levator scapulae due to increased task from a forward head posture have the right to lead come cervicogenic headaches.
See more: What Is Mako Island Really Called, Is Mako Island Real
The levator scapulae length and tension can be assessed by placing the patient in supine, stabilizing the ipsilateral scapula, and also contralateraly side bend and also rotate the head. Also, cause points are usual in this muscle and also can it is in palpated for in both the premium attachment and also inferior attachment.