Floor Of The Posterior Triangle

The posterior triangle of the neck contains many muscles which make up the borders and the floor of the area. Splenius capitis 3 m. The borders of the posterior triangle of the neck are formed by the trapezius muscle posteriorly the sternocleidomastoid muscle anteriorly and the omohyoid muscle inferiorly.

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The prevertebral fascia forms the floor of the posterior triangle of the neck figure 26 1c and d.

Floor of the posterior triangle.

An upper or. It is bounded in front by the posterior border of sternocleidomastoid behind by the anterior border of trapezius and below by the inferior belly of omohyoid. The floor of occipital triangle is formed from above downward by. From superior to inferior 1 m.

A significant muscle in the posterior triangle region is the omohyoid muscle. Scalenus posterior 5 m. It is split into two bellies by a tendon. Courses from the hyoid bone en route to the scapula within the pretracheal fascia.

The floor of the superior lumbar triangle is the transversalis fascia and its roof is the external abdominal oblique muscle. The muscular floor of posterior triangle is covered by prevertebral layer of deep cervical fascia which creates the fascial carpeting of the floor of the posterior triangle it creates axillary sheath around subclavian artery and brachial plexus going from the root of the neck to the upper limb. The roof is formed from the skin fascia and platysma. It is split into two bellies by a tendon.

The following structures are superficial to the prevertebral tascia. The superior lumbar grynfeltt lesshaft triangle is formed medially by the quadratus lumborum laterally by the posterior border of internal abdominal oblique muscle and superiorly by the 12th rib. Scalenus medius the first digitation of serratus anterior and the first rib are in the floor of this triangle. The posterior triangle is crossed about 2 5 cm above the clavicle by the inferior belly of the omohyoid muscle which divides the space into two triangles.

However it is limited superiorly by the inferior border of omohyoid. Semispinalis capitis 2 m. Levator scapulae 4 m. Fascial carpeting of the posterior triangle.

Interior belly ot the omohyoid muscle. The roof is formed by fascia and the floor is formed by the splenius capitus levator scapulae and scalene muscles. Indeed the posterior triangle forms the root of the upper limb. A significant muscle in the posterior triangle region is the omohyoid muscle.

It shares anterior and inferior margins with the posterior triangle. The lower part of the posterior triangle is crossed. The posterior triangle of the neck contains many muscles which make up the borders and the floor of the area.

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