NationMaster - Encyclopedia: Occipital 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. Image File history File links Gray512. ... Elseviers logo. ... In human anatomy, the sternocleidomastoid muscles are muscles in the neck that act to flex and rotate the head. ... Trapezius In human anatomy, the trapezius is a large superficial muscle on a persons back. ... The omohyoid muscle is a muscle at the front of the neck that consists of two bellies separated by an intermediate tendon. ...

Its floor is formed from above downward by the Splenius capitis, Levator scapulæ, and the Scaleni medius and posterior. The splenius capitis arises from the lower half of the ligamentum nuchÃ¦, from the spinous process of the seventh cervical vertebra, and from the spinous processes of the upper three or four thoracic vertebrÃ¦. The fibers of the muscle are directed upward and lateralward and are inserted, under cover of...

It is covered by the skin, the superficial and deep fasciæ, and by the Platysma below. The platysma is a superficial muscle that stretches from the clavicle to the mandible overlapping the sternocleidomastoid. ...

The accessory nerve is directed obliquely across the space from the Sternocleidomastoideus, which it pierces, to the under surface of the Trapezius; below, the supraclavicular nerves and the transverse cervical vessels and the upper part of the brachial plexus cross the space. The accessory nerve is the eleventh of twelve cranial nerves. ... In human anatomy, the sternocleidomastoid muscles are muscles in the neck that act to flex and rotate the head. ... Trapezius In human anatomy, the trapezius is a large superficial muscle on a persons back. ... The supraclavicular nerves (descending branches) arise from the third and fourth cervical nerves; they emerge beneath the posterior border of the Sternocleidomastoideus, and descend in the posterior triangle of the neck beneath the Platysma and deep cervical fascia. ... The brachial plexus is an arrangement of nerve fibres (a plexus) running from the spine (vertebrae C5-T1), through the neck, the axilla (armpit region), and into the arm. ...

A chain of lymph glands is also found running along the posterior border of the Sternocleidomastoideus, from the mastoid process to the root of the neck. Structure of the lymph node. ... In human anatomy, the sternocleidomastoid muscles are muscles in the neck that act to flex and rotate the head. ... A human neck. ...

See also

The posterior triangle (or lateral cervical region) is bounded, in front, by the Sternocleidomastoideus; behind, by the anterior margin of the Trapezius; its base is formed by the middle third of the clavicle; its apex, by the occipital bone. ...

External links

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. Georgetown University, incorporated as the The President and Directors of the College of Georgetown, is a private university in the United States, located in Georgetown, a historic neighborhood of Washington, D.C. Founded on January 23, 1789 by Archbishop John Carroll, it is both the oldest Roman Catholic and oldest... The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...

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General anatomy of head and neck

HEAD: Head and neck anatomy is a specialized study of the human body quite frequently studied in depth by surgeons, dentist, and dental technicians. ... In anatomy, the head of an animal is the rostral part (from anatomical position) that usually comprises the brain, eyes, ears, nose, and mouth (all of which aid in various sensory functions, such as sight, hearing, smell, and taste). ...

Skull - Forehead – Eye – Ear – Tongue – Teeth – Face – Cheek – Chin - Scalp Human skull (front) Human skull (side) In humans, the adult skull is normally made up of 22 bones. ... Sebastian Sznitka ... The human eye. ... Bat ears come in different sizes and shapes The ear is the sense organ that detects sound. ... The tongue is the large bundle of skeletal muscles on the floor of the foot that manipulates food for chewing and swallowing, (deglutition). ... This does not cite its references or sources. ... This article or section does not cite its references or sources. ... Look up Cheek in Wiktionary, the free dictionary The Cheeks are the fleshy area of the face below the eyes and between the nose and the left or right ear, the skin being suspended by the chin and the yaws. ... Look up Chin in Wiktionary, the free dictionary. ... The scalp is the anatomical area bordered by the face anteriorly and the neck to the sides and posteriorly. ...

Nose: Nostril - Nasal cavity - Nasal septum - cartilage (Accessory nasal cartilages, Cartilage of the septum, Greater alar cartilage, Lateral nasal cartilage, Lesser alar cartilages, Vomeronasal cartilage) - Vomeronasal cartilage - Choana - Turbinate - Sphenoethmoidal recess - Ethmoid bulla - Hiatus semilunaris - Ostium maxillare - Inferior meatus - Vomeronasal organ - Paranasal sinus - Olfactory glands - Human nose in profile A typical bulbous human nose Anatomically, a nose is a protuberance in vertebrates that houses the nostrils, or nares, which admit and expel air for respiration. ... A nostril is one of the two channels of the nose, from the point where they bifurcate to the external opening. ... The nasal cavity (or nasal fossa) is a large air-filled space above and behind the nose in the middle of the face. ... The nasal septum or septum nasi separates the left and right airways in the nose, dividing the two nostrils. ... The accessory nasal cartilages are small cartilages of the nose connecting the greater alar cartilage and lateral nasal cartilage. ... The cartilage of the septum (or septal cartilage, or quadrangular cartilage) is somewhat quadrilateral in form, thicker at its margins than at its center, and completes the separation between the nasal cavities in front. ... The greater alar cartilage (lower lateral cartilage) is a thin, flexible plate, situated immediately below the preceding, and bent upon itself in such a manner as to form the medial wall and lateral wall of the naris of its own side. ... The lateral cartilage (upper lateral cartilage) is situated below the inferior margin of the nasal bone, and is flattened, and triangular in shape. ... The part which forms the lateral wall is curved to correspond with the ala of the nose; it is oval and flattened, narrow behind, where it is connected with the frontal process of the maxilla by a tough fibrous membrane, in which are found three or four small cartilaginous plates... Choana (plural: Choanae) latinization from the Greek choanÄ“ meaning funnel is the posterior nasal aperture. ... In anatomy, a turbinate (or nasal concha) is a long, narrow and curled bone shelf (shaped like an elongated sea-shell) which protrudes into the breathing passage of the nose. ... On the lateral wall of the middle meatus is a curved fissure, the hiatus semilunaris, limited below by the edge of the uncinate process of the ethmoid and above by an elevation named the bulla ethmoidalis; the middle ethmoidal cells are contained within this bulla and open on or near... The hiatus semilunaris is a groove in the side wall inside the human nose. ... The inferior meatus, the largest of the three meatuses of the nose, is the space between the inferior concha and the floor of the nasal cavity. ... The vomeronasal organ (VNO) or Jacobsons organ (sometimes misspelled Jacobsens) is an auxiliary olfactory sense organ in some vertebrates, all of which are tetrapods. ... The paranasal sinuses are eight (four pairs) air-filled spaces, or sinuses, within the bones of the skull and face. ...

Mouth (Lip, Philtrum, Tongue) - Jaw Look up Mouth in Wiktionary, the free dictionary. ... Lips are a visible organ at the mouth of humans and many animals. ... The philtrum (Greek philtron, from philein, to love; to kiss) is the vertical groove in the upper lip, formed where the nasomedial and maxillary processes meet during embryonic development. ... The tongue is the large bundle of skeletal muscles on the floor of the foot that manipulates food for chewing and swallowing, (deglutition). ... It has been suggested that this article or section be merged with mandible. ...

NECK: A human neck. ...

Throat – Adam's apple - Larynx - Suboccipital triangle Look up Throat in Wiktionary, the free dictionary. ... An example of male laryngeal prominence. ... The pharynx (plural pharynx), or voicebox, is an organ in the neck of mammals involved in protection of the trachea and sound production. ...

Triangles of the neck: Anterior triangle of the neck (Inferior carotid triangle, Superior carotid triangle, Submaxillary triangle, Suprahyoid triangle) - Posterior triangle of the neck (Occipital triangle, Subclavian triangle) Anatomists use the term triangles of the neck to describe the divisions created by the major muscles in the region. ... 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 the... The inferior carotid triangle (or muscular triangle), is bounded, in front, by the median line of the neck from the hyoid bone to the sternum; behind, by the anterior margin of the Sternocleidomastoideus; above, by the superior belly of the Omohyoideus. ... The posterior triangle (or lateral cervical region) is bounded, in front, by the Sternocleidomastoideus; behind, by the anterior margin of the Trapezius; its base is formed by the middle third of the clavicle; its apex, by the occipital bone. ...