sternocleidomastoid

Examples of sternocleidomastoid in the following topics:

• Accessory (XI) Nerve

  • The accessory nerve (cranial nerve XI) controls the sternocleidomastoid and trapezius muscles of the shoulder and neck.
  • The accessory nerve provides motor innervation from the CNS to the sternocleidomastoid and trapezius muscles of the neck.
  • The sternocleidomastoid muscle tilts and rotates the head, while the trapezius muscle has several actions on the scapula, including shoulder elevation and adduction of the scapula.
  • Patients with spinal accessory nerve palsy may exhibit signs of lower motor neuron disease, such as atrophy and fasciculations of both the sternocleidomastoid and trapezius muscles.
  • Upon exiting the skull via the jugular foramen, the spinal accessory nerve pierces the sternocleidomastoid muscle before terminating on the trapezius muscle.

• Neck Muscles

  • Sternocleidomastoid – A thick rectangular muscle that is responsible for many movements within the neck.
  • Attachments – Dual-headed, the sternocleidomastoid originates from the clavicle and the sternum and attaches to the mandible.
  • Produced by the sternocleidomastoid, longissimus, splenius capitis, semispinalis, and trapezius (superior fibers)
  • Produced by the sternocleidomastoid, longissimus, splenius capitis, semispinalis, and trapezius (superior fibers)
  • Produced by the sternocleidomastoid, longissimus, splenius capitis, semispinalis, and trapezius (superior fibers)

• Cervical Plexus

  • It is located deep in the neck, near the sternocleidomastoid muscle.
  • The branches of the cervical plexus emerge from the posterior triangle at the nerve point, a point that lies midway on the posterior border of the sternocleidomastoid.

• Clavicle

  • At the medial end of the shaft the pectoralis major originates from the anterior surface, the posterior surface gives origin to the sternohyoid muscle and the superior surface the sternocleidomastoid muscle.

• Inspiration

  • Sternocleidomastoid muscle: muscles that connect the sternum to the neck and allow for rotation and turning of the head.

• Coryza and Influenza

  • Coryza may not always have an infectious or allergenic etiology and can be due to something as innocuous as a cold wind, spicy food, or tender points in the muscles of the neck such as the sternocleidomastoid.

• Asthma

  • Signs which occur during an asthma attack include the use of accessory muscles of respiration (sternocleidomastoid and scalene muscles of the neck), there may be a paradoxical pulse (a pulse that is weaker during inhalation and stronger during exhalation), and over-inflation of the chest.

• Functional Anatomy of the Respiratory System

  • During vigorous inhalation (at rates exceeding 35 breaths per minute), or in approaching respiratory failure, accessory muscles—such as the sternocleidomastoid, platysma, and the scalene muscles of the neck—are recruited to help sustain the increased respiratory rate.