Information about Lower Triangular Space
| The triangles of the neck. (Anterior triangles to the left; posterior triangles to the right.) | |
| Side of neck, showing chief surface markings. (Nerves are yellow, arteries are red.) | |
| subject #145 563 | |
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; behind, by the anterior margin of the Trapezius.
This space is subdivided into two large triangles by the Sternocleidomastoideus, which passes obliquely across the neck, from the sternum and clavicle below, to the mastoid process and occipital bone above.
The triangular space in front of this muscle is called the Anterior triangle of the neck; and that behind it, the Posterior triangle of the neck.
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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.General anatomy of neck (Throat • Pharynx • Larynx) | |
|---|---|
| Cartilages | Cricoid • Thyroid (Adam's apple) • Epiglottis • Arytenoid • Cuneiform • Corniculate |
| Ligaments | Extrinsic ligaments: Thyrohyoid membrane (Lateral thyrohyoid ligament, Median thyrohyoid ligament) • Hyoepiglottic ligament • Cricotracheal ligament Intrinsic ligaments: Cricothyroid ligament |
| Folds and related structures | Folds: (Glossoepiglottic, Aryepiglottic, Vocal, Vestibular) • Vocal ligament • Ventricle of the larynx • Infraglottic cavity • Vestibule of larynx • Rima glottidis • Glottis |
| Triangles of the neck | Anterior of the neck (Muscular, Carotid, Submandibular, Submental) • Posterior of the neck (Occipital, Subclavian) • Suboccipital |
| Fascia | Deep cervical fascia (Pretrachial fascia, Prevertebral fascia, Investing layer) • Carotid sheath |
| Other | Retropharyngeal space |
The neck is the part of the body on many limbed vertebrates that distinguishes the head from the torso or trunk.
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Anatomy of the human neck
Bony anatomy: The cervical spine
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mandible (from Latin mandibūla, "jawbone") or inferior maxillary bone is, together with the maxilla, the largest and strongest bone of the face . It forms the lower jaw and holds the lower teeth in place.
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The mastoid process is a conical prominence projecting from the undersurface of the mastoid portion of the temporal bone. It is located just behind the external acoustic meatus, and lateral to the styloid process.
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- Collarbone and collar bone redirect here. The eye abnormality is correctly spelled coloboma.
- This article uses some professional terms to describe relative positions and directions.
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This article or section may be confusing or unclear for some readers.
Please [improve the article] or discuss this issue on the talk page. This article has been tagged since December 2006.
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In human anatomy, the sternocleidomastoid (pronounced /ˌstɚ.noˌkli.dəˈmæs.tɔɪ̯d/) muscles are anterior muscles in the neck that act to flex and rotate the head.
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sternum (from Greek στέρνον, sternon, "chest" and hebrew pronounced "Shamokin" also meaning chest) or breastbone is a long, flat bone located in the center of the thorax (chest).
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- Collarbone and collar bone redirect here. The eye abnormality is correctly spelled coloboma.
- This article uses some professional terms to describe relative positions and directions.
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The mastoid process is a conical prominence projecting from the undersurface of the mastoid portion of the temporal bone. It is located just behind the external acoustic meatus, and lateral to the styloid process.
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The occipital bone, a saucer-shaped membrane bone situated at the back and lower part of the cranium, is trapezoid in shape and curved on itself. It is pierced by a large oval aperture, the foramen magnum, through which the cranial cavity communicates with the vertebral canal.
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The anterior triangle is bounded, in front, by the middle line of the neck; behind, by the anterior margin of the Sternocleidomastoideus; its base, directed upward, is formed by the lower border of the body of the mandible, and a line extending from the angle of the mandible to
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The posterior triangle (or lateral cervical region) is a region of the neck.
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Boundaries
It has the following boundaries:- in front, by the posterior border of the Sternocleidomastoideus
- behind, by the anterior border of the Trapezius
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Georgetown University is a private, Jesuit, research university, located in Washington, D.C.'s Georgetown neighborhood. Father John Carroll founded the school in 1789, though its roots extend back to 1634.
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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Human anatomy is primarily the scientific study of the morphology of the adult human body.[1] It is subdivided into gross anatomy and microscopic anatomy.[1]
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The neck is the part of the body on many limbed vertebrates that distinguishes the head from the torso or trunk.
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Anatomy of the human neck
Bony anatomy: The cervical spine
The cervical portion of the human spine..... Click the link for more information.
In anatomy, the throat is the part of the neck anterior to the vertebral column. It consists of the pharynx and larynx. An important feature of the throat is the epiglottis, a flap which separates the oesophagus from the trachea and prevents inhalation of food or drink.
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The pharynx (plural: pharynges) is the part of the neck and throat situated immediately posterior to the mouth and nasal cavity, and cranial, or superior, to the esophagus, larynx, and trachea.
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The larynx (plural larynges), colloquially known as the voicebox, is an organ in the neck of mammals involved in protection of the trachea and sound production.
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Cartilage is a type of dense connective tissue. It is composed of collagen fibers and/or elastin fibers, and can supply smooth surfaces for the movement of articulating bones.
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The cricoid cartilage, or simply cricoid (from the Greek krikoeides meaning "ring-shaped"), is the only complete ring of cartilage around the trachea.
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Location
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The thyroid cartilage is the largest of the nine cartilages that make up the laryngeal skeleton, the cartilage structure in and around the trachea that contains the larynx.
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The epiglottis is a lid-like flap of elastic cartilage tissue covered with a mucus membrane, attached to the root of the tongue. It projects obliquely upwards behind the tongue and the hyoid bone.
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The arytenoid cartilages are a pair of small three-sided pyramids which form part of the larynx, to which the vocal cords are attached.
Each is pyramidal in form, and has three surfaces, a base, and an apex.
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Each is pyramidal in form, and has three surfaces, a base, and an apex.
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The cuneiform cartilages of the larynx (cartilages of Wrisberg) are two small, elongated pieces of yellow elastic cartilage, placed one on either side, in the aryepiglottic fold, where they give rise to small whitish elevations on the surface of the mucous membrane, just in front
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The corniculate cartilages (cartilages of Santorini) are two small conical nodules consisting of yellow elastic cartilage, which articulate with the summits of the arytenoid cartilages and serve to prolong them backward and medialward.
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In anatomy, the term ligament is used to denote three different types of structures:[1]
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- Fibrous tissue that connects bones to other bones. They are sometimes called "articular ligaments"[2], "fibrous ligaments", or "true ligaments".
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The hyothyroid membrane (thyrohyoid membrane) is a broad, fibro-elastic layer, attached below to the upper border of the thyroid cartilage and to the front of its superior cornu, and above to the upper margin of the posterior surface of the body and greater cornua of the
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The lateral thyrohyoid ligament (lateral hyothyroid ligament) is a round elastic cord, which forms the posterior border of the hyothyroid membrane and passes between the tip of the superior cornu of the thyroid cartilage and the extremity of the greater cornu of the hyoid
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