The word "musculus zygomaticus major" may seem daunting in terms of its spelling, but using the International Phonetic Alphabet (IPA) makes it easier to understand. The "mu" sound is pronounced as /mjuː/, followed by the "sk" sound as /sk/. The "uh" vowel sound is pronounced as /ə/, and the "lu" sound as /lu/. The "s" sound is represented by /s/ and the "zygo" sound by /zaɪɡəʊ/. Finally, the "ma" sound is pronounced as /meɪdʒə/. When all these sounds are put together, the word becomes easier to pronounce and understand.
The "musculus zygomaticus major" is a specific facial muscle that belongs to the group of muscles known as mimetic muscles, which are responsible for various facial expressions. This particular muscle is located in the cheek area and is commonly referred to as the major zygomatic muscle. It originates from the zygomatic bone, which is commonly called the cheekbone, and extends downward towards the corners of the mouth.
The primary function of the musculus zygomaticus major is to elevate the corners of the mouth, thus enabling the formation of a smile expression. When this muscle contracts, it pulls the lips upward and laterally, creating a characteristic curve on the face. Additionally, it aids in the movement of the underlying tissues, enhancing the expression of joy, happiness, or amusement.
This muscle is innervated by the facial nerve, also known as the seventh cranial nerve, which supplies motor function to the muscles of the face. The musculus zygomaticus major works in conjunction with other facial muscles, such as the musculus orbicularis oculi, to produce a genuine and comprehensive smile expression.
Overall, the musculus zygomaticus major plays a significant role in facial expression and is essential for displaying positive emotions such as happiness or pleasure.
M. zygomaticus.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.