"Weak lower traps are a common cause of shoulder and
scapula related injuries. Such injuries are likely to be occur on bench press
or over head movements, which require scapular retraction, depression and/or
upward rotation."
Why is that?
''The trapezius muscle, like the serratus anterior, serves
to elevate, retract, and rotate the scapula. The muscle originates from the
skull and the spinous processes of the first cervical vertebra through the 12th
thoracic vertebra. The primary insertion is along the spine of the scapula.
Separated into three components, the superior portion elevates the scapula and
rotates the lateral angle upwardly, the middle portion adducts and retracts,
and the inferior portion depresses the scapula and rotates the inferior angle
laterally. The trapezius is solely innervated by the spinal accessory nerve, or
cranial nerve XI, which crosses the posterior cervical triangle superficially
before diving vertically along the deep surface of the trapezius.''
No comments:
Post a Comment