How many strap muscles are there

Read it at Google Books - Find it at Amazon 3. Hartwig W. Fundamental Anatomy. Read it at Google Books - Find it at Amazon 4. Head and neck fascia and compartments: no space for spaces.

Susan Standring. Gray's Anatomy. Related articles: Anatomy: Head and neck. Promoted articles advertising. Loading more images Close Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Loading Stack - 0 images remaining. By System:. Patient Cases. Contact Us. If the suprahyoid muscles contract when the infrahyoid muscles are relaxed , the hyoid bone is elevated. This article will further explore the suprahyoid and infrahyoid muscles individually, showing their function , origins and insertions , as well as their innervation and vasculature.

The suprahyoid muscles act to depress the mandible when the infrahyoid muscles are contracted and to elevate the hyoid bone when the mandible is fixed. The suprahyoid muscles consist of four muscles: digastric , stylohyoid , mylohyoid and geniohyoid muscles. These muscles contribute to swallowing and mastication , therefore they are commonly referred to as accessory muscles of mastication.

Digastric, mylohyoid and geniohyoid also contribute to the floor of the mouth. The suprahyoid muscles are primarily supplied by branches of the facial artery , with the occipital and lingual arteries also contributing.

The digastric muscle has two bellies ; the anterior and posterior bellies which are separated by the intermediate tendon. As the bellies of the digastric muscle have different embryological origins, they are innervated by different nerves:. The stylohyoid muscle is a thin strip of muscle, located superior to the posterior belly of the digastric muscle. Mylohyoid is a broad and triangular muscle which meets its partner from the other side to form the floor of the oral cavity, as well as supporting the floor of the mouth.

The geniohyoid muscle lies deep to mylohyoid muscle, near to the midline of the neck. There are four infrahyoid muscles: omohyoid , sternohyoid , sternothyroid and thyrohyoid. In general, they act to depress the hyoid bone and play an important role in the position of the larynx and swallowing.

The infrahyoid muscles lie in two planes; the superficial plane omohyoid and sternohyoid muscles and the deep plane sternothyroid and thyrohyoid muscles. They are supplied by the superior and inferior thyroid arteries and drained by the corresponding veins. The omohyoid muscle consists of a superior and inferior belly, which are connected by a muscular tendon.

The sternohyoid muscle is located within the superficial plane, medial to the omohyoid. The sternothyroid muscle lies posterior to the sternohyoid within the deep plane. The thyrohyoid muscle is short and superior to the sternothyroid. It is considered to be a continuation of the sternothyroid muscle. Bacteria spread within the connective tissue of the floor of the mouth and through the pharynx, causing symptoms such as difficulty swallowing, pain on swallowing and fever.

The pathogens can easily migrate through the connective tissue of the mylohyoid muscles into the submandibular region. This can become more serious if the pathogens spread cranially into the skull or caudally into the mediastinum. The infrahyoid muscles function to depress the hyoid bone and larynx during swallowing and speech. Infrahyoid muscles The infrahyoid muscles , or strap muscles , are a group of four pairs of muscles in the anterior frontal part of the neck. Infrahyoid muscles Muscles of the neck seen from the front.

The infrahyoid muscles are coloured in violet. Retrieved 24 May Gray's anatomy: the anatomical basis of clinical practice. Louis, Mo: Elsevier Churchill Livingstone. ISBN Muscles of the neck. Platysma Sternocleidomastoid Longus capitis Longus colli Scalene anterior middle posterior Rectus capitis anterior muscle Rectus capitis lateralis muscle. Rectus capitis posterior major minor Obliquus capitis inferior superior. Mylohyoid Stylohyoid Digastric Geniohyoid.