What is the sternocleidomastoid muscle?

The sternocleidomastoid muscle (SCM) is an important landmark in the neck which divides it into an anterior and a posterior triangle. This muscle binds the skull to the sternum and clavicle.

Does the sternohyoid elevate the larynx?

The omohyoid, sternohyoid, and thyrohyoid act to depress the hyoid bone. The thyrohyoid elevates the larynx whereas the sternothyroid depress the larynx.

What is the sternothyroid muscle?

The sternothyroid is a paired, flat strap of muscle that serves to fix the hyoid bone as well as depressing the larynx in phonation and in the terminal phase of swallowing.

Where is the Sternothyroid muscles located?

The sternothyroid muscle, or sternothyroideus, is an infrahyoid muscle in the neck. It acts to depress the hyoid bone. It is below the sternohyoid muscle. It is shorter and wider than the sternohyoid.

Which muscle pulls the corners of the mouth superiorly and laterally when it contracts?

The risorius muscle's function is to aid in facial expression by pulling the corner of the mouth laterally via its contraction in an outward and upward motion. In conjunction with other facial muscles, this helps to create a smile or a frown, and myriad other expressions in-between.

Which of the following muscle groups is innervated by the facial nerve?

The facial nerve passes through the stylomastoid foramen in the skull and terminates into the zygomatic, buccal, mandibular, and cervical branches. These nerves serve the muscles of facial expression, which include the frontalis, orbicularis oculi, orbicularis oris, buccinator, and platysma muscles.

Are there two Sternohyoid muscles?

The sternohyoid, sternothyroid, and sternocleidomastoid muscles originate at the manubrium. The sternohyoid muscle runs from the dorsal manubrium to the ventrocaudal hyoid bone, with attachments to the sternoclavicular joint capsule, and the sternothyroid muscle attaches along the dorsal midline of the manubrium.

What Innervates the Thyrohyoid muscle?

The thyrohyoid muscles are innervated by a branch of the ventral ramus of C1 from the cervical plexus, which courses with the hypoglossal nerve. The nerve fibers are thus not from the hypoglossal nucleus.

What is the Stylohyoid muscle?

The stylohyoid muscle, also known as musculus stylohyoideus in Latin, is one of the suprahyoid muscles of the neck as it extends between the base of the skull and the hyoid bone. It is a slender muscle present along the superior border of the posterior belly of the digastric muscle.

What is a Suprahyoid muscle?

The suprahyoid muscles are those above or superior to the hyoid bones of the neck. They elevate the hyoid bone when the mandible is fixed in place, and lower the mandible when the hyoid is held firm by muscles beneath it.

How was the Sternohyoid named?

The first root word of sternohyoid is "sterno," this equates to the sternum while the last root word is "hyoid," which references the hyoid bone. The simplicity of the name of this muscle is that its name explains the regions that it originates from and to which it attaches.

What is the Subclavius muscle?

The subclavius muscle is a small triangular muscle of the pectoral region which depresses the shoulder.

Where are the infrahyoid muscles?

The infrahyoid muscles are coloured in violet. The infrahyoid muscles, or strap muscles, are a group of four pairs of muscles in the anterior (frontal) part of the neck. The four infrahyoid muscles are the sternohyoid, sternothyroid, thyrohyoid and omohyoid muscles.

Where is the genioglossus muscle?

The genioglossus muscle is a fan-shaped muscle that is involved in forming most of the tongue mass. It emerges from the superior mental spines and inserts on the hyoid bone as well as the inferior portion of the tongue.

Where are the strap muscles?

The infrahyoid muscles or strap muscles are a group of four paired muscles in the anterior neck below the hyoid bone, within the muscular triangle.

What muscle is the antagonist to the sternocleidomastoid?

The sternocleidomastoid muscles help to flex the neck. Their antagonists are the longus capitis and the rectus capitis anterior.

How many sternocleidomastoid muscles are there?

The sternocleidomastoid muscle (SCM) is one of more than 20 pairs of muscles that act on the neck. SCM has a dual-innervation and multiple functions.

What is the sternocleidomastoid muscle used for?

The SCM muscle helps turn and bend your neck

The sternocleidomastoid is a superficially located neck muscle that plays an important role in tilting your head and turning your neck, as well as other things. It courses from the back of your head and attaches to your breastbone and collar bone.