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Neck muscle anatomy

By Edited Sep 15, 2016 0 0

Overview of the neck muscle anatomy

Neck muscle anatomy

The neck muscle anatomy is made up of muscles that support the head, move the head in so many directions like rotation, flexion and extension.

The neck muscle anatomy is divided into 2 major groups, the superficial muscles and the deep muscles

   
   
   
   
   

Superfical muscles.

Deep muscles.

*platysma *scalene muscles
*suprahyoid muscles *Anterior  vertebral muscles
*Infrahyoid muscles  
*sternocleidomastoid  

 

Platysma - Neck muscle anatomy
Platysma: Originates from subcutaneous skin over deltoid-pectoral region (from the thoracic fascia). It functions to depress the mandible and lower lip, tenses the skin under the neck and prevents the subcutaneous veins from compressing.

Sternocleidomastoid muscle - Muscle of neck anatomy
Sternocleidomastoid muscle: It has two heads; one originates from the manubrium of the sternum and the other from the sternal end of the clavicle. The two head both terminate at the mastoid process and superior nuchal line. It functions to rotate the face in the opposite direction, bilaterally flexes the neck, elevates the head and maintains the head above the vertical positions.

Suprahyoid muscles

They are five muscles that make up this group;

  • Digastric muscle.
  • Stylohoid muscle.
  • Myohyoid muscle.
  • Geniohyoid muscle.
  • Hyoglosus muscle.

Digastric muscle - Muscle of neck anatomy
Digastric muscle: It originates from the mastoid notch of the temporal bone (posterior belly) and digastric fossa of the internal mandible (anterior belly). Both bellies meet and insert at the lateral aspect of the body of hyoid by a pulley tendon. The muscle functions to opens the mouth by depressing the mandible, flexes the hyoid bone for infrahyoid action if mandible is flexed.

Mylohyoid muscle - Anatomy neck muscle
Mylohyoid muscle: It originates from the mylohyoid line of the mandible and inserts at the body of the hyoid bone (posterior fiber) and along the midline at myohyoid raphe.

Action: It depresses the mandible, and pulls the hyoid bone upwards (if mandible is fixed) and elevates the hyoid. It forms the muscular floor of the mouth.

Stylohyoid muscle - Anatomy of the neck muscle
Stylohyoid muscle: It originates from the styloid process of the temporal bone and inserts at the hyoid bone. It functions to pull the hyoid bone upwards and backwards.

Geniohyoid muscle - Anatomy of neck muscle
Geniohyoid muscle: This muscle is paired, it originate from mental spine of the mandible and inserts at the body of the hyoid bone.

It functions to pull the tongue and depress the mandible (if hyoid is fixed).

Hyoglosal muscle - Anatomy of muscles of neck

Hyoglosal muscle.

Infrahyoid muscles

This group of muscle consists of four muscles;

  • Sternohyoid muscle.
  • Omohyoid muscle.
  • Sternothyroid muscle.
  • Thyrohyoid muscle.

Sternohyoid muscle - Anatomy of the muscle of neck
Sternohyoid muscle: It originates from posterior surface of the manubrium and sternal end of the clavicle. It then inserts at the body of hyoid. It functions to depress the hyoid and larynx, acts eccentrically with the suprahyoid muscle to provide them with a stable base.

Omohyoid muscle - Anatomy of muscle of the neck
Omohyoid muscle: The superior belly originates from the hyoid bone and inferior belly from the superior scapular border (notch). Both bellies meet at clavicle and held to clavicle by a pulley tendon.

It functions to compress jugular vein, same roll as sternohyoid. And it pulls pretracheal fascia.

Sternothyriod muscle - Anatomy of neck muscle
Sternothyriod muscle: It originates from posterior surface of the manubrium sterni and first rib and inserts on the oblique line of thyroid cartilage. It has same function as stenohyoid.

Thyrohyoid muscle - Anatomy of the neck muscle
Thyrohyoid muscle: It originates from oblique line of the thyroid cartilage and inserts on the body of hyoid bone. It functions depresses the hyoid and may also help in larynx and thyroid gland elevation.

Deep muscles of the neck

Scalene muscles (stria): It originates from transverse processes of cervical vertebrae, scalenus anterior and medius insert into the first rib, whereas the scalenus posterior attach to the second rib.

There are three scalenus muscles;

Scalenus anterior - Anatomy neck muscle
  • Scalenus anterior: originates from the anterior tubercles of transverse processes of C3 to C4.
    Scalenus medius - Anatomy of the muscle of the neck
  • Scalenus medius: originates from posterior tubercle of transvers process of all cervical vertebrae.
    Scalenus posterior - Neck muscle anatomy
  • Scalenus posterior: originates from the posterior tubercle of the transverse processes of C4 to C6.

Action of scalenus muscle: if transverse processes are fixed they elevate the ribs for respiration, if ribs are fixed they rotate head to side opposite of contraction, flextion and bending the cervical region of the spine.

Paravertebralis (anterior vertebral muscles)

They lie in the groove between the vertebral bodies and their transverse processes. They have two groups;

Longus colli muscle - Muscle of neck anatomy
a)      Longus colli muscle: it originates from the lower anterior vertebral bodies and transvers processes. Insertion: same place as origin but below.

Longus capitis muscle - Anatomy of the neck muscle
b)      Longus capitis muscle: originates upper anterior vertebral bodies and transverse processes. Insertion: anterior vertebral bodies and transverse processes several segments above at the base of the occipital bone.

All muscles that make up the neck muscle anatomy receive their blood supply from the branches of the axillary artery and are innervated by the posterior rami of spinal nerves.

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