Platysma muscle

Platysma muscle

:"Platysma is also a plant taxon synonym with Podochilus, an orchid genus."Infobox Muscle
Name = PAGENAME
GraySubject = 110
GrayPage = 387


Caption = Platysma is visible at bottom, in neck
Origin = inferior clavicle and fascia of chest
Insertion = mandible
Blood = |inferior thyroid atery
Nerve = cervical branch of the facial nerve (CN VII)
Action = Draws the corners of the mouth inferiorly and widens it (as in expressions of sadness and fright). Also draws the skin of the neck superiorly when teeth are clenched
Antagonist = Masseter, Temporalis
DorlandsPre = p_23
DorlandsSuf = 12646241
The platysma is a superficial muscle that overlaps the sternocleidomastoid.

It is a broad sheet arising from the fascia covering the upper parts of the pectoralis major and deltoid; its fibers cross the clavicle, and proceed obliquely upward and medially along the side of the neck.

The anterior fibers interlace, below and behind the symphysis menti, with the fibers of the muscle of the opposite side; the posterior fibers cross the mandible, some being inserted into the bone below the oblique line, others into the skin and subcutaneous tissue of the lower part of the face. Many of these fibers blend with the muscles about the angle and lower part of the mouth.

Sometimes fibers can be traced to the zygomaticus, or to the margin of the orbicularis oculi. Beneath the platysma, the external jugular vein descends from the angle of the mandible to the clavicle.

Variations

Variations occur in the extension over the face and over the clavicle and shoulder; it may be absent or interdigitate with the muscle of the opposite side in front of the neck; attachment to clavicle, mastoid process or occipital bone occurs. A more or less independent fasciculus, the occipitalis minor, may extend from the fascia over the trapezius to fascia over the insertion of the sternocleidomastoideus.

Nerve

The platysma is supplied by the cervical branch of the facial nerve.

Actions

When the entire platysma is in action it produces a slight wrinkling of the surface of the skin of the neck in an oblique direction. Its anterior portion, the thickest part of the muscle, depresses the lower jaw; it also serves to draw down the lower lip and angle of the mouth in the expression of melancholy.

External links

*


=Additional

External links

*
*
* [http://www.posilovani.net/foto/anatomie/krk/platysma.jpgImage]


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • platysma muscle — see platysma …   Medical dictionary

  • Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… …   Medical dictionary

  • Muscle platysma — Muscle peaucier du cou Le muscle peaucier du cou, ou platysma, est un muscle qui s insère sur l os mandibule et la commissure des lèvres en haut et irradie dans la peau en bas, suivant un trajet vertical. Il est sous le contrôle du nerf facial et …   Wikipédia en Français

  • Muscle Peaucier Du Cou — Le muscle peaucier du cou, ou platysma, est un muscle qui s insère sur l os mandibule et la commissure des lèvres en haut et irradie dans la peau en bas, suivant un trajet vertical. Il est sous le contrôle du nerf facial et effectue l ascension… …   Wikipédia en Français

  • Muscle peaucier du cou — Le muscle peaucier du cou, ou platysma, est un muscle qui s insère sur l os mandibule et la commissure des lèvres en haut et irradie dans la peau en bas, suivant un trajet vertical. Il est sous le contrôle du nerf facial et effectue l ascension… …   Wikipédia en Français

  • Muscle triangulaire des lèvres — Muscle abaisseur de l angle de la bouche Muscle abaisseur de l angle de la bouche (en rouge). Le muscle abaisseur de l angle de la bouche (Musculus depressor anguli oris en latin) ou muscle triangulaire des lèvres est un petit muscle triangulaire …   Wikipédia en Français

  • Muscle abaisseur de l'angle de la bouche — (en rouge). Le muscle abaisseur de l angle de la bouche (Musculus depressor anguli oris en latin) ou muscle triangulaire des lèvres est un petit muscle triangulaire pair de la partie latérale du menton. Sommaire …   Wikipédia en Français

  • Muscle — For other uses of Muscle , see Muscle (disambiguation). A top down view of skeletal muscle Muscle (from Latin …   Wikipedia

  • Temporalis muscle — Muscle infobox Name = Temporalis muscle Latin = musculus temporalis GraySubject = 109 GrayPage = 386 Caption = The Temporalis; the zygomatic arch and Masseter have been removed. Origin = temporal lines on the parietal bone of the skull. Insertion …   Wikipedia

  • platysma — SYN: p. (muscle). [G. p., a flatplate] * * * pla·tys·ma plə tiz mə n, pl ma·ta mət ə also mas a broad thin layer of muscle that is situated on each side of the neck immediately under the superficial fascia belonging to the group of facial muscles …   Medical dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”