Bounded by the scm trapezius and middle third of the clavicle.
Muscles forming floor of posterior triangle.
Floor posterior arch of atlas and posterior atlantooccipital membrane ligament.
Interior belly ot the omohyoid muscle.
Levator scapulae 4 m.
Semispinalis capitis 2 m.
Scalene tubercle of inner border of 1st rib and near groove of subclavian a.
Anterior tubercles of transverse proc.
Investing layer of the cervical fascia.
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.
The inferior belly crosses the posterior triangle travelling in an supero medial direction and splitting the.
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.
A significant muscle in the posterior triangle region is the omohyoid muscle.
Scalenus posterior 5 m.
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.
Splenius capitis 3 m.
Boundaries of posterior cervical triangle apex.
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 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.
It is split into two bellies by a tendon.
Scm and trapezius meet on the superior nuchal line of the occipital bone.
The following structures are superficial to the prevertebral tascia.
The suboccipital triangle has three boundaries contained between a floor and roof.
From superior to inferior 1 m.
A roof.
The posterior triangle of the neck contains many muscles which make up the borders and the floor of the area.
Muscles covered by the prevertebral layer of the cervical fascia.
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Courses from the hyoid bone en route to the scapula within the pretracheal fascia.