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Inferior boundary (apex) Jugular notch in the manubrium of the sternum: 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 ...
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 ...
Lateral (away from the midline), formed by the anterior belly of the digastricus; Medial (towards the midline), formed by the midline of the neck between the mandible and the hyoid bone; Inferior (below), formed by the body of the hyoid bone; Floor is formed by the mylohyoideus; Roof is formed by investing layer of deep cervical fascia
The boundaries of the submental space are: the mylohyoid muscle superiorly; the investing layer of deep cervical fascia (and this in turn is covered by the platysma muscle) inferiorly; the inferior border of the mandible anteriorly; the hyoid bone posteriorly; the anterior bellies of the digastric muscles laterally.
The anatomic boundaries of each submandibular space are: [2] the mylohyoid muscle superiorly, the skin, superficial fascia, platysma muscle and superficial layer of the deep cervical fascia inferiorly and laterally, the medial surface of the mandible anteriorly and laterally, the hyoid bone posteriorly, the anterior belly of the digastric ...
Muscles of the neck attach to the skull, hyoid bone, clavicles and the sternum. They bound the two major neck triangles; anterior and posterior. [1] [7] Anterior triangle is defined by the anterior border of the sternocleidomastoid muscle, inferior edge of the mandible and the midline of the neck.
In a newborn, the junction of the parietal bones with the frontal and occipital bones, form the anterior (front) and posterior (back) fontanelle, or soft spots. The separation of the cranial bone plates at time of birth facilitate passage of the head of the fetus through the mother's birth canal, or pelvic girdle. The parietal bones, and ...
Above, the fascia is attached to the superior nuchal line of the occipital bone, to the mastoid process of the temporal bone, and to the whole length of the inferior border of the body of the mandible. [3] Opposite the angle of the mandible the fascia is very strong, and binds the anterior edge of the sternocleidomastoideus firmly to that bone.