Scalenus posterior 5 m.
Muscles forming floor of posterior triangle.
Semispinalis capitis 2 m.
Suboccipital muscles and contents of the suboccipital triangle.
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.
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.
Scalene tubercle of inner border of 1st rib and near groove of subclavian a.
The prevertebral fascia forms the floor of the posterior triangle of the neck figure 26 1c and d.
The roof is formed by fascia and the floor is formed by the splenius capitus levator scapulae and scalene muscles.
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The suboccipital triangle has three boundaries contained between a floor and roof.
A roof.
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 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.
A significant muscle in the posterior triangle region is the omohyoid muscle.
Courses from the hyoid bone en route to the scapula within the pretracheal fascia.
Muscles covered by the prevertebral layer of the cervical fascia.
The following structures are superficial to the prevertebral tascia.
Scm and trapezius meet on the superior nuchal line of the occipital bone.
Levator scapulae 4 m.
Floor posterior arch of atlas and posterior atlantooccipital membrane ligament.
Splenius capitis 3 m.
Boundaries of posterior cervical triangle apex.
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.
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.
Bounded by the scm trapezius and middle third of the clavicle.
Investing layer of the cervical fascia.
Anterior tubercles of transverse proc.
It is split into two bellies by a tendon.