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UKCD Posterior Trian

learning objectives to posterior triangle

What is the key muscle of the neck? What is it’s innervation? The sternocleidomastoid muscle. CN XI (the spinal accessory n.)
What does the sternocleidomastoid muscle divide the neck into? Two triangles - an anterior and a posterior triangle.
List the boundaries of the posterior triangle. The trapezius posteriorly, the sternocleidomastoid anteriorly, and the clavicle inferiorly.
What structure divides the posterior triangle into two subtriangles? The inferior belly of the omohyoid.
Name these two smaller triangles that the posterior triangle is split into. A large, superior occipital triangle, and a lower, smaller supraclavicular triangle.
List at least one important structure in the lower of these two triangles of the posterior triangle The subclavian artery is found in the lower part of the supraclavicular triangle.
The ventral rami of which two plexuses can be found in the posterior triangle? The brachial and cervical plexuses.
What are the root values (spinal cord levels involved in the formation) of each plexus? Cervical plexus = C1-C4; the brachial plexus = C5-T1.
Which of these two plexuses is purely sensory? The cervical plexus.
Be able to label the muscles that form the floor of the posterior triangle, from inferior to superior. The muscles of the floor (from inferior to superior) are: scalenus anterior, scalenus medius, levator scapulae, splenius capitis, semispinalis capitis.
Between which two muscles is the brachial plexus located? The scalenus anterior and medius.
Where is the scalenus posterior located? It lies posterior to the scalenus medius.
Name the nerve that can be found lying superficial to the scalenus anterior? The phrenic nerve.
Name the nerve superficial to the levator scapulae? CN XI - the (spinal) accessory nerve.
Created by: wiechartm



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