Answer
The lateral compartment of the leg contains two primary muscles, the fibularis brevis and fibularis longus (also known as peroneus brevis and peroneus longus). These muscles play important roles in ankle eversion and providing stability to the foot and ankle. Here's an overview of these two muscles:
1. **Fibularis Brevis (Peroneus Brevis):**
- **Location:** The fibularis brevis muscle is situated in the lateral compartment of the leg.
- **Origin:** It originates from the lower two-thirds of the fibula (the smaller of the two lower leg bones).
- **Insertion:** The muscle inserts onto the base of the fifth metatarsal bone in the foot.
- **Function:** The primary function of the fibularis brevis is to evert the foot (turn the sole of the foot outward). It also provides stability to the ankle joint and assists in maintaining balance during activities like walking and running.
2. **Fibularis Longus (Peroneus Longus):**
- **Location:** The fibularis longus muscle is also located in the lateral compartment of the leg.
- **Origin:** It originates from the upper two-thirds of the fibula.
- **Insertion:** The muscle inserts onto the base of the first metatarsal bone and the medial cuneiform bone in the foot.
- **Function:** The primary function of the fibularis longus is to evert the foot and plantarflex the ankle. Additionally, it provides support to the foot's arch and contributes to maintaining balance during weight-bearing activities.
These two muscles, the fibularis brevis and fibularis longus, work together to perform eversion of the foot, which is the action of turning the sole of the foot outward. This movement is important for maintaining stability during various physical activities and helps in adapting to uneven surfaces.
Work Step by Step
The lateral compartment of the leg contains two primary muscles, the fibularis brevis and fibularis longus (also known as peroneus brevis and peroneus longus). These muscles play important roles in ankle eversion and providing stability to the foot and ankle. Here's an overview of these two muscles:
1. **Fibularis Brevis (Peroneus Brevis):**
- **Location:** The fibularis brevis muscle is situated in the lateral compartment of the leg.
- **Origin:** It originates from the lower two-thirds of the fibula (the smaller of the two lower leg bones).
- **Insertion:** The muscle inserts onto the base of the fifth metatarsal bone in the foot.
- **Function:** The primary function of the fibularis brevis is to evert the foot (turn the sole of the foot outward). It also provides stability to the ankle joint and assists in maintaining balance during activities like walking and running.
2. **Fibularis Longus (Peroneus Longus):**
- **Location:** The fibularis longus muscle is also located in the lateral compartment of the leg.
- **Origin:** It originates from the upper two-thirds of the fibula.
- **Insertion:** The muscle inserts onto the base of the first metatarsal bone and the medial cuneiform bone in the foot.
- **Function:** The primary function of the fibularis longus is to evert the foot and plantarflex the ankle. Additionally, it provides support to the foot's arch and contributes to maintaining balance during weight-bearing activities.
These two muscles, the fibularis brevis and fibularis longus, work together to perform eversion of the foot, which is the action of turning the sole of the foot outward. This movement is important for maintaining stability during various physical activities and helps in adapting to uneven surfaces.
