Muscles Forming Floor Of Posterior Triangle

Scalene tubercle of inner border of 1st rib and near groove of subclavian a. 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. Boundaries of posterior cervical triangle apex.

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Muscles forming floor of posterior triangle.

Interior belly ot the omohyoid muscle. Muscles forming floor of post cerv triangle cont d anterior scalene hidden behind scm o. The floor of the posterior triangle is formed by the splenius muscles the levator scapula the three scalene muscles and the inferior belly of the omohyoid n26. It is split into two bellies by a tendon.

Muscles covered by the prevertebral layer of the cervical fascia. To better expose the floor of the triangle up of the posterior thoracic wall in the 6th and 7th intercostal space a patient is asked to fold their arms across their chest laterally rotating the scapulae while bending forward at the trunk somewhat resembling a fetal position. Floor posterior arch of atlas and posterior atlantooccipital membrane ligament. 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 posterior 5 m. The following structures are superficial to the prevertebral tascia. Courses from the hyoid bone en route to the scapula within the pretracheal fascia. Bounded by the scm trapezius and middle third of the clavicle.

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. Investing layer of the cervical fascia. Scm and trapezius meet on the superior nuchal line of the occipital bone.

The suboccipital triangle has three boundaries contained between a floor and roof. Anterior tubercles of transverse proc. Splenius capitis 3 m. A significant muscle in the posterior triangle region is the omohyoid muscle.

From superior to inferior 1 m. This ligament is broad and extends from the posterior margin of the foramen magnum to the posterior arch of atlas. Typically the triangle of auscultation is covered by the scapula. Suboccipital muscles and contents of the suboccipital triangle.

The roof is formed by fascia and the floor is formed by the splenius capitus levator scapulae and scalene muscles. A roof. Levator scapulae 4 m. The inferior belly crosses the posterior triangle travelling in an supero medial direction and splitting the.

Semispinalis capitis 2 m.

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