Cards (11)

  • NECK MUSCLES
    • Platysma
    [a] Sternocleidomastoid
    [b] Splenius Capitis
    [c] Levator Scapula
    [d] Scalenus Medius
    [e] Scalenus Anterior
    [f] Trapezius
    [g] Inferior Hyoideus
    [h] Sternohyoideus
  • Platysma (not seen on the image)
    ○ Structure: Single, sheetlike muscle that covers the anterolateral neck
    ○ Insertion: area around the mouth
    ○ Pull the corners of the mouth inferiorly to produce a downward sag of the mouth; Hence, producing the “sad clown face”
    ○ The “shaving muscle”
    ○ Movement: tenses skin of the neck during shaving
  • Sternocleidomastoid
    ○ Structure: Two-headed muscles found on each side of the neck
    ○ One head arises from the sternum and the other from the clavicle
    ○ The “prayer muscle”
    ○ Movement: flexing the neck (bowing of the head)
    ○ If only one muscle contracts, the face is rotated toward the shoulder on the opposite side and tilts the head to its own side
  • Splenius Capitis
    Deep muscle of the neck
    ○ Origin: the lower half of the nuchal ligament and the spinous processes of the 7th cervical vertebra and the superior 3 thoracic vertebra
    ○ Insertion: the mastoid process of the temporal bone
    ○ Movement: laterally flex and rotate the neck
  • Levator Scapula
    ○ Posterior axio-appendicular muscle
    ○ Connects the upper limb to the vertebral column and lies in the posterior triangle of the neck
    ○ Superior aspect is covered by sternocleidomastoid, and its inferior part by trapezius
  • Scalenus Medius
    ○ Located between levator scapula
    ○ Largest and longest muscle in the scalene group of lateral neck muscles
    ○ Often penetrated by the dorsal scapular and long thoracic nerves
    ○ Deeply placed, lying behind sternocleidomastoid
  • Scalenus Anterior
    ○ Anteriorly located, belongs to the scalene group
    ○ Deeply placed, lying behind the sternocleidomastoid
    ○ Located between the subclavian vein and the subclavian artery
  • Trapezius
    ○ Pair of large triangular muscles extending over the back of the neck and shoulders
    ○ Stabilize and move the scapula
    ○ Movements:
    ■ Its upper fibers can elevate and upwardly rotate the scapula and extend the neck
    ■ Its middle fibers adduct / retract the scapula
  • Inferior Hyoideus
    ○ Attached to the hyoid bone
  • Sternohyoideus
    ○ Attached to the sternum and the hyoid bone
  • TORTICOLLIS or WRYNECK - an injury where the neck remains rotated toward one side. It is caused by a difficult birth where one of the sternocleidomastoid muscles is injured and developed spasms.