Floor Of Posterior Triangle Of Neck
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Levator scapulae 4 m.
Floor of posterior triangle of neck. It is split into two bellies by a tendon. The floor of occipital triangle is formed from above downward by. The prevertebral fascia forms the floor of the posterior triangle of the neck figure 26 1c and d. 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.
Courses from the hyoid bone en route to the scapula within the pretracheal fascia. Splenius capitis 3 m. 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. Like comment share subscribe all tcml hand written notes and chart available on tcml facebook page.
Indeed the posterior triangle forms the root of the upper limb. The anterior triangle and the posterior triangle of the neck each of them containing a few subdivisions. The posterior triangle of the neck contains many muscles which make up the borders and the floor of the area. Scalenus posterior 5 m.
Interior belly ot the omohyoid muscle. Therefore pus in the posterior triangle deep to prevertebral fascia arising from tubercular cervical vertebra may track downwards and laterally along the. From superior to inferior 1 m. The triangles of the neck are the topographic areas of the neck bounded by the neck muscles.
The posterior triangle of the neck contains many muscles which make up the borders and the floor of the area. The posterior triangle is bounded by the scm trapezius and middle third of the clavicle with a muscular floor formed by the lateral deep cervical muscles. The muscular floor of posterior triangle is covered by prevertebral fascia which extends around the brachial plexus and axillary artery continuation of subclavian artery as axillary sheath. The following structures are superficial to the prevertebral tascia.
It is split into two bellies by a tendon. A significant muscle in the posterior triangle region is the omohyoid muscle. It is subdivided by the diagonally placed inferior belly of the omohyoid. 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 roof is formed by fascia and the floor is formed by the splenius capitus levator scapulae and scalene muscles. A significant muscle in the posterior triangle region is the omohyoid muscle. The triangles of the neck are important because of their contents as they house all the neck structures.
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