Superficial Back Line (SBL)

 Purpose: The SBL connects and supports the entire posterior aspect of the body, maintaining upright posture and facilitating extension movements.

Anatomy Trains Components

• Primary Muscles/Structures:
  • Plantar fascia
  • Achilles tendon
    
  • Gastrocnemius
  • Hamstrings
  • Sacrotuberous ligament
  • Erector spinae
  • Thoracolumbar fascia
  • Galea aponeurotica

Corresponding TCM Sinew Channels

• Leg Tai Yang (Bladder Sinew Channel)

  • Functions: Supports the back of the leg, traveling from the foot to the head. This channel aligns closely with the SBL, facilitating movements like spinal extension and maintaining an upright posture.

• Arm Tai Yang (Small Intestine Sinew Channel)

  • Functions: Extends from the little finger, up the arm, to the shoulder and neck. It integrates with the back muscles and coordinates back extension with arm movements.

Primitive Reflexes

• Spinal Galant Reflex
  • Movement Patterns: Involves lateral flexion of the trunk in response to stimulation along the side of the spine, engaging the SBL in maintaining back posture.
• Moro Reflex
  • Movement Patterns: Sudden extension followed by flexion of the arms and legs, engaging the SBL in response to changes in position or perceived threats.

Directional Flow (Qi Dynamic)

• Ascending and Descending
  • Description: The SBL supports vertical flow through the back of the body, starting from the plantar fascia, moving up through the legs, along the spine, and reaching the head. This vertical flow is crucial for maintaining upright posture and balance.

Integration with Movement

• Extension and Upright Posture
  • Description: The SBL is primarily engaged in movements that extend the body, such as standing up straight, bending backward, and maintaining posture during standing or walking.