digastric muscle造句

• Each person has a right and left digastric muscle.
• The digastric muscles are present in a variety of animals, specific attachment sites may vary.
• Likewise, we speak of the digastric even though there is a right and left digastric muscle.
• The anterior division gives off branches to the four main muscles of mastication and a anterior belly of the digastric muscle.
• In the neck, the accessory nerve crosses the internal jugular vein around the level of the posterior belly of digastric muscle.
• The stylohyoid muscle, stapedius and posterior belly of the digastric muscle are also innervated by the facial nerve, but are not considered muscles of facial expression.
• This space is bounded behind by the sternocleidomastoid, above by the stylohyoid and the posterior belly of the digastric muscle, and below by the superior belly of the omohyoid.
• An area in the neck sometimes called the Pirogov triangle is formed by the intermediate tendon of the digastric muscle, the posterior border of the mylohyoid muscle, and the hypoglossal nerve.
• The upper sternocleidomastoid branch diverts from the main trunk at the deep border of the proximal end of the posterior digastric muscle belly, coursing with the spinal accessory nerve prior to arborising into the sternocleidomastoid.
• The mammalian stapedius evolved from a muscle called the depressor mandibulae in other tetrapods, the function of which was to open the jaws ( this function was taken over by the digastric muscle in mammals ).
• The digastric muscle stretches between the mastoid process of the cranium to the mandible at the chin, and part-way between, it becomes a tendon which passes through a tendinous pulley attached to the hyoid bone.
• It descends in a groove on the deep surface of the ramus of the mandible, and reaching the under surface of the mylohyoid muscle, it supplies both the mylohyoid and the anterior belly of the digastric muscle.
• On the medial side of the process is a deep groove, the mastoid notch ( digastric fossa ), for the attachment of the digastric muscle; medial to this is a shallow furrow, the occipital groove, which lodges the occipital artery.
• The lateral aspect is more involved, and is bordered by the ramus of the mandible, the deep lobe of the parotid gland, the medial pterygoid muscle, and below the level of the mandible, the lateral aspect is bordered by the fascia of the posterior belly of digastric muscle.
• After emerging from the hypoglossal canal, it gives off a small meningeal branch and picks up a branch from the anterior posterior belly of the digastric muscle, it passes to the submandibular region, passes upwards and anteriorly on the hyoglossus muscle, and deep to the stylohyoid muscle and lingual nerve.
• The largest of muscles that attach to the upper surface of the greater horns are the hyoglossus and the middle pharyngeal constrictor, which extend along the whole length of the horns; the digastric muscle and stylohyoid muscle have small insertions in front of these near the junction of the body with the cornu.
• These ossified plates ( or rami ), which can be U-shaped or V-shaped, The muscles that depress the lower mandible are usually weak, except in a few birds such as the starlings and the extinct Huia, which have well-developed digastric muscles that aid in foraging by prying or gaping actions.
• It is relatively superficial at its start, where it is contained in the carotid triangle of the neck, and lies behind and medial to the external carotid, overlapped by the sternocleidomastoid muscle, and covered by the deep fascia, the platysma, and integument : it then passes beneath the parotid gland, being crossed by the hypoglossal nerve, the digastric muscle and the stylohyoid muscle, the occipital artery and the posterior auricular artery.