ANATOMY – NECK – MUSCLES


MUSCLE ANATOMY – THE NECK


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STERNOCLEIDOMASTOID


Radiopaedia .
It has two heads that meld to form one insertion. Sternocleidomastoid muscle, along with the trapezius muscle, is invested by the superficial layer of the deep cervical fascia, which splits around it. Sternocleidomastoid muscle divides the neck into anatomical anterior and posterior triangles


SCALENES – ANTERIOR-MEDIUS-POSTERIOR


Radiopaedia – The scalene muscles are a group of three closely related neck muscles.

  • Origin: C2 – C7
  • Insertion:
    Anterior: inner border of first rib (scalene tubercle)
    Medius or Middle: upper surface of first rib
    Posterior: outer surface of second rib
  • Innervation: C3 – C8
  • Action:
    Anterior: (1) raises first rib -inspiration (2) adjunct: neck rotation/flexion
    Medius or Middle: (1) raises first rib – respiratory inspiration (2) acting bilaterally: neck flexion (3) acting unilaterally: lateral neck flexion and rotation
    Posterior: (1) raises second rib – respiratory inspiration (2) acting together: neck flexion (3) acting on one side: lateral neck flexion and rotation

LEVATOR SCAPULAE


Radiopaedia .
– A muscle of the upper limb that connects the pectoral girdle to the cervical spine.
  • Origin: C1-C4 transverse processes
  • Insertion: superior angle of the scapula
  • Innervation: direct branches from the C3-4 spinal nerves, and the dorsal scapular nerve (C5)
  • Action: (1) elevates medial border of the scapula (2) when scapula is fixed, lateral flexion of the neck

SPLENIUS CAPITIS


–  Radiopaedia .
– A strap-like muscles that, along with the splenius cervicis, comprise the superficial layer of intrinsic back muscles.

VIDEOS


  1. THE NOTED ANATOMIST – TRIANGLES of the NECK .
    (1) Anterior Triangle (2) Posterior Triangle
  2. NOTED ANATOMIST – MUSCLES & NERVES of the NECK .
  3. WEBSTER – POSTERIOR NECK MUSCLES .
  4. WEBSTER – LATERAL NECK MUSCLES .





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