Boundaries
- Sup. - Clavicle
- Inf. - 3rd rib
- Medi - sternum
- lat. - Deltoideopectoralis sulcus (groove)
- → Forms deltoideopectoral triangle wich cephalic v. pass through it.
Surface Anatomy:
- 1. Skin & Subcutaneus tissue.
- → Innervated by supraclavicular ns & Ant. and lat. branches of first 2 intercostal nerves.
- 2. Superficial fascia
- 3. Deep fascia ( Pectoralis fascia)
- 2 layers :
- → Superficial layer - covers the external aspect of pectoralis major
- → Deep layer ( Claviopector fascia)
- ↳ cover the deep compartment.
- 4. Pectoralis minor
- 5. vessels & nerves.
Deep Compartment:
Subdivided into 3 triangular segments.
- 1. Claviopectoral triangle: bounded b/w. the clavicle & the sup. margin of pectoral minor m.
- → The NVB of fossa axillaries passes behind the lateral part of the triangle.
- 2. Pectoral triangle: limited within margins of pectoral minor m.
- 3. Subpectoral trian: b/w. the inf. border of pectoralis m. & free margin of pectoralis major m.
Clinical Significance:
- Infraclavicular Block: Clinicians use this region for infraclavicular brachial plexus blocks to provide anesthesia or analgesia for the upper limb. It can be performed without arm abduction, making it useful for patients with limited shoulder mobility 2.
- 2. Skin turgor test
- 3. Surgical approach to brachial plexus.
Clinical significance
- m. pectoralis major:
- sulcus deltoideopectoralis – vena cephalica
- sulcus interpectoralis – a benchmark for surgical intervention on the breast
- m. serratus anterior:
- deformation in scapular location after trauma or surgical intervention