Floor Of The Posterior Triangle

However it is limited superiorly by the inferior border of omohyoid.
Floor of the posterior triangle. Semispinalis capitis 2 m. The posterior triangle of the neck contains many muscles which make up the borders and the floor of the area. A significant muscle in the posterior triangle region is the omohyoid muscle. The floor of the superior lumbar triangle is the transversalis fascia and its roof is the external abdominal oblique muscle.
It is split into two bellies by a tendon. Fascial carpeting of the posterior triangle. It shares anterior and inferior margins with the posterior triangle. The lower part of the posterior triangle is crossed.
The roof is formed by fascia and the floor is formed by the splenius capitus levator scapulae and scalene muscles. Interior belly ot the omohyoid muscle. It is split into two bellies by a tendon. 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.
The prevertebral fascia forms the floor of the posterior triangle of the neck figure 26 1c and d. 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 posterior triangle of the neck contains many muscles which make up the borders and the floor of the area. Indeed the posterior triangle forms the root of the upper limb.
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 following structures are superficial to the prevertebral tascia. The roof is formed from the skin fascia and platysma. 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.
From superior to inferior 1 m. The floor of occipital triangle is formed from above downward by. 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.
Levator scapulae 4 m. Courses from the hyoid bone en route to the scapula within the pretracheal fascia. Scalenus posterior 5 m.