The provided reference describes the function of the long thoracic nerve, which is a nerve in the thoracic region. Here's a breakdown of its function:
Long Thoracic Nerve Function
The long thoracic nerve is a motor nerve that plays a vital role in upper body movement and respiration. Its primary function is to control the serratus anterior muscle, which is crucial for several actions.
Specific Functions:
-
Scapular Movement:
- The long thoracic nerve activates the serratus anterior muscle to pull the scapula (shoulder blade) forward around the thorax (rib cage).
- This movement allows for anteversion of the arm, which is the forward movement of the arm from the shoulder joint. Think about reaching forward or throwing a ball; this is enabled by the serratus anterior and its controlling long thoracic nerve.
-
Respiration:
- The serratus anterior also helps lift the ribs, which assists in the process of breathing. This is especially helpful during strenuous activities when deeper breaths are needed.
In Summary
The long thoracic nerve is essential for movements involving pushing, reaching, throwing, and various other activities that require the forward and upward movement of the shoulder. It also plays a vital role in normal respiratory function. Damage to the long thoracic nerve can lead to "winging" of the scapula.
| Function | Description |
|---|---|
| Scapular Protraction | Pulls the scapula forward around the thorax, allowing forward arm movement |
| Arm Anteversion | Enables the forward motion of the arm from the shoulder joint |
| Respiratory Assistance | Lifts ribs to aid in breathing, especially during increased physical activity. |
