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The triangles of the neck describe the divisions created by the major muscles in the region.. The side of the neck presents a somewhat quadrilateral outline, limited, above, by the lower border of the body of the mandible, and an imaginary line extending from the angle of the mandible to the mastoid process; below, by the upper border of the clavicle; in front, by the middle line of the neck ...
Anterior boundary. Midline of the neck from chin to the jugular notch. Posterior boundary. The anterior margin of sternocleidomastoid. Superior boundary (base) The lower border of the body of the mandible, and a line extending from the angle of the mandible to the mastoid process. Investing fascia covers the roof of the triangle while visceral ...
The suboccipital triangle is a region of the neck bounded by the following three muscles of the suboccipital group of muscles: (Rectus capitis posterior minor is also in this region but does not form part of the triangle) It is covered by a layer of dense fibro-fatty tissue, situated beneath the semispinalis capitis.
The submental triangle (or suprahyoid triangle) is a division of the anterior triangle of the neck.
The nerves descend in the posterior triangle of the neck beneath the platysma muscle and the deep cervical fascia. [citation needed] Near the clavicle, the supraclavicular nerves perforate the fascia and the platysma muscle to become cutaneous. They are arranged, according to their position, into three groups—anterior, middle, and posterior. [2]
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: an upper or occipital triangle. a lower or subclavian triangle (or supraclavicular triangle)
The anterior vertebral muscles. The scalene muscles are a group of three muscles on each side of the neck, identified as the anterior, the middle, and the posterior. They are innervated by the third to the eighth cervical spinal nerves (C3-C8). The anterior and middle scalene muscles lift the first rib and bend the neck to the side they are on.
Stylohyoid muscle in purple. The stylohyoid muscle is one of the suprahyoid muscles. [1] Its originates from the styloid process of the temporal bone; it inserts onto hyoid bone. It is innervated by a branch of the facial nerve. It acts draw the hyoid bone upwards and backwards.
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