anatomical models do they ean be demonstrated by identifying their O On the skel

Question

anatomical models do they ean be demonstrated by identifying their O On the skeleton, identify the aspect of the sacrum, liac crest, spinous processes of T theough T and all five vertebrac. These skeletal structures are the bony origins of the erector pinae Link pipe cleaners together to make chains of dafferent lengtha Position the ends of these the posterior surface of the sacrum and extend them vertically to the various insertions of the crector iocostalis angles of the ribs oe transverse processes of C, through C, (red arrow angle). Longissimus: t processes of thoracic and cervical vertebrac, tubercles of the inferior nine ribs, or the mastoid process (yellow arrow projects to mastoid process). Spinalis spinous processes of thoracic or cervical vertebrae (black arrow projects to a thoracic vertebra). lliac crest Sacrum Posterior view Examine the connections of the transversospinalis On a skelketon MAKING CONNECTIONS Acting together, the erector spinae muscles are the primary extensors of the vertebral column and the head. The transversospinalis muscles are synergists for this action. Identify a muscle that acts as an antagonist and explain why it is. place one end of a pipe cleaner on the transverse process of any vertebra and extend it superiorly by one to three vertebrae, to a spinous process (blue arrows). Notice that the transversospinalis muscles are within the bony groove formed by the serial arrangement of transverse and pinous processes. O Bend forward (flex) at the waist As you slowly straighten (extend) the spine, concentrate on feeling the pull in your back, along the vertebrae. You are feeling the collective actions of the deep back muscles.

Explanation / Answer

Following 3 muscles are antagonist to erector spine and trensversospinalis (in neck extension) -

These three group of muscle act as antagonist in spine extension because they cause spine flexion, moreover they also prevent overextension of spine (thus preventing damage) to spine in. In spine extension erector spine contracts while the above mentioned 3 muscles relax thus forming agonist - antagonist pair.

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