Anatomy Bones and Muscles · MU Pleven

215. Regio dorsi. Spinal canal and its content.

Covers the regions of the back in turn: surface landmarks and descriptive lines, then the posterior cervical, scapular, infrascapular, lumbar and sacral regions with their borders, layers, nerves and vessels. It also describes the suboccipital triangle, the suprascapular and spinoglenoid notches, and the superior and inferior lumbar triangles. The section on the vertebral canal lists its boundaries and contents, including the meninges, spinal arteries and venous plexuses, with notes on disc herniation. Several clinical notes are included, such as occipital neuralgia, suprascapular nerve compression and supraclavicular block.

Inside: 13 sections · 10 labelled pictures · 15 flashcards · 11 min

Topic 214 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 13 sections, about 1,599 words (11 min of reading), with 15 flashcards.

In this note

  1. REGIONS OF THE BACK
  2. POST. CERVICAL Region.
  3. Scapular Region :
  4. Infrascapular Region
  5. Lumbar Region
  6. Clinical Significance
  7. VERTEBRAL CANAL
  8. SACRAL REGION
  9. Shape and Boundaries:
  10. Skin and Superficial Fascia:
  11. Nerve and Vascular Supply:
  12. Deep Fascia and Muscles:
  13. Bony Structures and Foramina:

REGIONS OF THE BACK

- Anatomical landmarks of this region :

  1. 1. External occipital protuberance
  2. 2. Spinous process of C7.
  3. 3. Spinous process of thoracic vertebra.
  • ↳ Become obvious during spine flexion, with the T1 being the most prominent.
  1. 4. Parts of the scapula:
  • - Sup. Angle : level of T2.
  • - spine : T3-T4
  • - Inf. Angle : T7.

- Several lines are used for descriptive purposes :

→ Vertical lines:

  1. 1. Post. median line - from occipital protuberance to coccygeal bone.
  2. 2. Paravertebral lines - Along the levatores Costarum m
  3. 3. Scapular lines - through inf. scapular Angle.

→ Horizontal lines:

  1. 1. Interspinal line - Connects the two scapular spines
  2. 2. Crist lin - Connects the highest points of the iliac crests, usually btw. L4/L5 vertebrae.

POST. CERVICAL Region.

Borders

Sup.: superior nuchal line.

Inf.: the line connecting the C7 spinous process with acromion scapula.

laterally: line btw. mastoid processes and acromion scapula.

Surface Anatomy:

  1. 1. Skin - thick with limited mobility
  2. 2. Superficial fascia - Contains sensory nerves & blood vessels.
  3. 3. Deep fascia : an extension of the investing cervical fascia.
  • ↳ Attached medially to the nuchal ligament.
  1. 4. Muscles.

Suboccipital triangle:

  1. 1. Borders:
  • Floor: Formed by the posterior arch of the atlas (C1 vertebra) and the posterior atlanto-occipital membrane (ligament).
  • Roof: Composed of the semispinalis capitis muscle, which covers all suboccipital muscles.
  • Superomedial border: Rectus capitis posterior major muscle.
  • Superolateral border: Obliquus capitis superior muscle.
  • Inferolateral border: Obliquus capitis inferior muscle.
  1. 2. Contents:
  • Vertebral artery (third part): Passes through the suboccipital triangle.
  • Suboccipital nerve (C1): Also found within this region.
  • Suboccipital venous plexus.
  1. 3. Clinical Relations:
  • Occipital neuralgia: A condition associated with pain in the occipital region, often related to the suboccipital triangle.

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