Floor Of The Posterior Triangle

It is split into two bellies by a tendon.

Floor of the posterior triangle.

Levator scapulae 4 m. The prevertebral fascia forms the floor of the posterior triangle of the neck figure 26 1c and d. The posterior triangle of the neck contains many muscles which make up the borders and the floor of the area. 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.

A significant muscle in the posterior triangle region is the omohyoid muscle. 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. Scalenus medius the first digitation of serratus anterior and the first rib are in the floor of this triangle. It shares anterior and inferior margins with the posterior triangle.

The following structures are superficial to the prevertebral tascia. Indeed the posterior triangle forms the root of the upper limb. Semispinalis capitis 2 m. 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 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. The lower part of the posterior triangle is crossed. From superior to inferior 1 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.

The roof is formed by fascia and the floor is formed by the splenius capitus levator scapulae and scalene muscles. It is split into two bellies by a tendon. The floor of the superior lumbar triangle is the transversalis fascia and its roof is the external abdominal oblique muscle. A significant muscle in the posterior triangle region is the omohyoid muscle.

The floor of occipital triangle is formed from above downward by. Courses from the hyoid bone en route to the scapula within the pretracheal fascia. Splenius capitis 3 m. The roof is formed from the skin fascia and platysma.

The posterior triangle of the neck contains many muscles which make up the borders and the floor of the area. Interior belly ot the omohyoid muscle. Scalenus posterior 5 m.