Anatomy Bones and Muscles · MU Pleven

207. Regio sternocleidomastoidea.

Covers the sternocleidomastoid region, starting with its boundaries and surface anatomy, including the platysma, external jugular vein, cervical plexus and the neighbouring muscles. It then explains how the space behind the muscle divides into the antescalene, interscalene and scaleno-vertebral spaces, listing the structures in each, such as the venous angle, subclavian vessels and brachial plexus, and the phrenic and vagus nerves.

Inside: 4 sections · 2 labelled pictures · 15 flashcards · 1 min

Topic 206 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 4 sections, about 185 words (1 min of reading), with 15 flashcards.

In this note

  1. STERNOCLEIDOMASTOID REGION (SCM)
  2. Boundaries :
  3. Surface Anatomy :
  4. Subdivisions :

Boundaries :

The boundaries of SCM muscle.

Surface Anatomy :

  1. 1. Skin
  2. 2. Subcutaneous tissue
  • Contains
  • Platysma m.
  • Enclosed by superficial fascia.
  • External jugular vein.
  • Cervical plexus
  1. 3. SCM m.
  • Enveloped in the split of investing layer of deep cervical fascia.
  1. 4. Cervical neurovascular bundle.
  2. 5. Omohyoid m. (in the lower part).
  3. 6. Sternothyroid m.

Subdivisions :

In the inferior part of SCM region, the space behind the muscle is subdivided into several spaces :

1. Antescalane Space :

  • Enclosed btw. SCM & ant. scalenus m.
  • Content:
  1. 1. Venous angle
  • Accepts:
  1. 1. Superficial veins of the neck.
  2. 2. Thoracic duct (on the left)
  3. 3. Right lymphatic duct (on the right)
  4. 2. Internal jugular v.
  5. 3. Common carotid art.
  6. 4. Vagus n.

runs medial

2. Interscalene space

  • Between ant. & middle scaleni m. & the first rib.
  • Content:
  1. 1. Subclavian art.
  • gives only one br.
  • costocervical trunk.
  1. 2. Brachial plexus,

3. Scaleno-vertebral triangle:

Deepest & most inf. part of the SCM region.

  • Boundaries :
  • Later. - ant. scalene m.
  • Medi - trachea, esophagus
  • Inf. - Dome of pleura
  • Content:
  • Subclavian art & v.
  • gives vertebral art.
  • Sympathetic trunk
  • Vagus n & Phrenic n.

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