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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 ...
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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)
This space is subdivided into four smaller triangles by the digastricus above, and the superior belly of the omohyoideus. These smaller triangles are named: the muscular triangle; the carotid triangle; the submandibular triangle; the submental triangle
The occipital triangle, the larger division of the posterior triangle, is bounded, in front, by the Sternocleidomastoideus; behind, by the Trapezius; below, by the Omohyoideus. Its floor is formed from above downward by the Splenius capitis , Levator scapulæ , and the Scalenus medius and posterior.
The suboccipital triangle is a region of the neck bounded by the following three muscles of the suboccipital group of muscles: Rectus capitis posterior major - above and medially; Obliquus capitis superior - above and laterally; Obliquus capitis inferior - below and laterally
The posterior part of this triangle contains the external carotid artery, ascending deeply in the substance of the parotid gland. This vessel lies here in front of, and superficial to, the external carotid, being crossed by the facial nerve, and gives off in its course the posterior auricular, superficial temporal, and internal maxillary branches: more deeply are the internal carotid, the ...
Anatomy figure: 25:01-03 at Human Anatomy Online, SUNY Downstate Medical Center - "Identification of the subdivsions of the anterior triangle and corresponding borders." Anatomy photo:25:19-0101 at the SUNY Downstate Medical Center - "Anterior Triangle of the Neck: The Submental Triangle"