Fibula

Question 1

Bones for Fibula

Answer 1

1. Structure:
   - Proximal Epiphysis: The upper end of the fibula, which articulates with the tibia at the tibiofibular joint.
   - Shaft (Diaphysis): The long, slender middle portion of the fibula.
   - Distal Epiphysis: The lower end of the fibula, which forms the lateral malleolus, an important structure for ankle stability.
2. Surfaces and Borders:
   - Facies Lateralis: The lateral surface of the fibula.
   - Margo Anterior: The anterior border of the fibula.
   - Facies Medialis: The medial surface of the fibula, which faces the tibia.
   - Margo Posterior: The posterior border of the fibula.
   - Margo Interosseus: The interosseous border that faces the tibia and is connected to it via the interosseous membrane.

Question 2

Muscles of Fibula

Answer 2

The fibula serves as an attachment point for several muscles, primarily those involved in the movement of the foot and ankle. Key muscle groups include:

1. Peroneus Longus:
   - Origin: Head and upper two-thirds of the fibula.
   - Insertion: Base of the first metatarsal and medial cuneiform.
   - Function: Plantarflexion and eversion of the foot.
2. Peroneus Brevis:
   - Origin: Lower two-thirds of the fibula.
   - Insertion: Base of the fifth metatarsal.
   - Function: Plantarflexion and eversion of the foot.
3. Flexor Hallucis Longus:
   - Although primarily associated with the tibia, it also has attachments near the fibula and aids in flexing the big toe

Question 3

Joints Involving the Fibula

Answer 3

1. Tibiofibular Joint:
   - Proximal Tibiofibular Joint: A plane-type synovial joint between the head of the fibula and the lateral condyle of the tibia.
   - Distal Tibiofibular Joint: A syndesmosis joint where the fibula and tibia are connected by ligaments at the ankle.
2. Ankle Joint (Talocrural Joint):
   - The distal end of the fibula forms the lateral malleolus, which is crucial for the stability of the ankle joint.

Question 4

Ligaments Associated with the Fibula

Answer 4

1. Syndesmosis Tibiofibularis: Strong ligaments connecting the distal ends of the tibia and fibula.
2. Ligamentum Talofibulare Anterius: Connects the lateral malleolus to the talus.
3. Ligamentum Talofibulare Posterius: Connects the lateral malleolus to the talus posteriorly.
4. Ligamentum Calcaneofibulare: Connects the lateral malleolus to the calcaneus

Question 5

Blood Vessels for Fibula

Answer 5

1. Arterial Supply:
   - Arteria Fibularis (Peroneal Artery): A branch of the posterior tibial artery that supplies the fibula and surrounding muscles.
   - Arteria Tibialis Anterior: Supplies the anterior compartment of the leg and contributes to the blood supply of the fibula.
2. Venous Drainage:
   - The venous drainage follows the arterial supply, with the fibular veins draining into the posterior tibial vein.

Question 6

Nerves for Fibula

Answer 6

1. Nervus Peroneus Communis (Common Fibular Nerve):
   - A branch of the sciatic nerve that innervates the muscles of the lateral compartment (peroneus longus and brevis) and the anterior compartment (tibialis anterior, extensor hallucis longus, etc.).
2. Nervus Peroneus Superficialis:
   - Provides sensory innervation to the dorsal aspect of the foot and motor innervation to the lateral compartment muscles.
3. Nervus Peroneus Profundus:
   - Supplies the anterior compartment muscles and provides sensory innervation to the web space between the first and second toes.