Suboccipital triangle

suboccipital triangle

1. Suboccipitaltriangle

2. •Pair of muscular triangles
•Situated each side of the midline

3. •Muscles of back are arranged in 4
layers
•I layer
•Trapezius
•Latissimus dorsi
•II layer
•LevatorScapulae
•Rhomboideusminor
•Rhomboideusmajor
•III layer
•Erector spinae
•3 groups
•Lateral
•Iliocostalis
•Intermediate
•Longissimus
•Medial
•Semispinalis
•IV layer
•Rotators, interspinalis, intertransverses&
muscles forming the suboccipitaltriangle

4. Suboccipitaltriangle
Roof
•Semispinaliscapitis(Medially)
•Splenius capitis& longissimus
capitis(Laterally)
•Floor
•Posterior arch of atlas
•Posterior atlanto-occipital membrane
Semispinalis capitis
Splenius capitis
Longissimus
capitis

5. Suboccipitaltriangle
Boundaries
•Supero-medially
•Rectus capitisposterior major
•Supero-laterally
•Obliquus capitissuperior
•Inferiorly
•Obliquus capitisinferior

6. Suboccipitaltriangle -contents
•Third part of vertebral artery
•First cervical nerve (suboccipital
nerve)
•Suboccipitalplexus of veins

8. Applied anatomy
•Cisternalpuncture
•Procedure to approach cisterna
magna
•In posterior cranial fossa through
foramenmagnum
•By piercing the posterior atlanto-
occipital membrane
•To obtain CSF