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Above by the superior belly of the omohyoid.
Muscular triangle floor. The suboccipital triangle floor is deep to the muscular triangle i e. The sternocleidomastoid muscle divides the neck into the two major neck triangles. The following structures are superficial to the prevertebral tascia. The triangles of the neck are surgically focused first described from early dissection based anatomical studies which predated cross sectional anatomical description based on imaging see deep spaces of the neck.
The boundaries of the muscular triangle are. However the majority state that it is the medial border of the adductor longus and this is definition we have gone with. Submandibular triangle is bordered by the mandible and bellies of the digastric muscle. It is covered by the integument superficial fascia platysma and deep fascia ramifying in which are some of the branches of the supraclavicular.
The prevertebral fascia forms the floor of the posterior triangle of the neck figure 26 1c and d. Behind by the anterior margin of the sternocleidomastoid. The roof is located superficially i e. Mŭs kyū lăr trī ang gĕl the triangle bounded by the sternocleidomastoid muscle the superior belly of the omohyoid muscle and the anterior midline of the neck.
Anterior formed by the posterior atlantooccipital membrane and posterior arch of the atlas 1. Posterior and is formed by the semispinalis capitis muscle and a dense layer of adipose tissue 1. The pelvic floor or pelvic diaphragm is composed of muscle fibers of the levator ani the coccygeus muscle and associated connective tissue which span the area underneath the pelvis the pelvic diaphragm is a muscular partition formed by the levatores ani and coccygei with which may be included the parietal pelvic fascia on their upper and lower aspects. The muscular triangle contains some muscles and organs the infrahyoid muscles the pharynx and the thyroid parathyroid glands.
The infrahyoid muscles occupy most of it. Trigonum musculare ta. The muscular triangle is one of the paired triangles in the anterior triangle of the neck. It also has a floor and a roof.
The triangles of the neck are important because of their contents as they house all the neck structures including glands nerves vessels and lymph nodes. The muscular triangle is situated more inferiorly than the subdivisions. Some sources consider the lateral border of the adductor longus to be the medial border of the femoral triangle. A major landmark of the submandibular triangle is the submandibular gland innervated by the facial nerve.
The anterior triangle and the posterior triangle of the neck each of them containing a few subdivisions. The rest of this muscle forms part of the floor of the triangle. This salivary gland can be described as having two lobes which are divided by the posterior border of the mylohyoid muscle. Interior belly ot the omohyoid muscle.
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