ANATOMY-NECK-MUSCLES


MUSCLE ANATOMY – THE NECK


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STERNOCLEIDOMASTOID


– Last revised by Dr Francis Deng on 12 Oct 2020
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

SCALENUS – ANTERIOR-MEDIUS-POSTERIOR


Last revised by Dr Daniel J Bell on 16 May 2021
  • Origin: C2 – C7
  • Insertion:
    Anterior: inner border of first rib (scalene tubercle)
    Medius: 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: (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


– Last revised by Dr Daniel J Bell on 22 Aug 2019
– 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


– Last revised by Assoc Prof Frank Gaillard on 02 Aug 2021
– A strap-like muscles that, along with the splenius cervicis, comprise the superficial layer of intrinsic back muscles.

YOUTUBE 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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