ONLINE MEDICAL SOLUTIONS

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Tuesday, December 27, 2011

Peroneus brevis

10:02 PM

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The peroneus brevis muscle (or fibularis brevis) lies under cover of the peroneus longus, and is a shorter and smaller muscle.

It arises from the lower two-thirds of the lateral surface of the body of the fibula; medial to the Peroneus longus; and from the intermuscular septa separating it from the adjacent muscles on the front and back of the leg.
The fibers pass vertically downward, and end in a tendon which runs behind the lateral malleolus along with but in front of that of the preceding muscle, the two tendons being enclosed in the same compartment, and lubricated by a common mucous sheath.
It then runs forward on the lateral side of the calcaneus, above the trochlear process and the tendon of the Peronæus longus, and is inserted into the tuberosity at the base of the fifth metatarsal bone, on its lateral side.

The terms "Peroneal" (i.e., Artery, Retinaculum) and "Peroneus" (i.e., Longus and Brevis) are derived from the Greek word Perone (pronounced Pair-uh-knee) meaning pin of a brooch or a buckle. In medical terminology, both terms refer to being of or relating to the fibula or to the outer portion of the leg.

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Posted in: 3D Animation

Medial and Lateral Collateral Ligaments of Ankle

9:51 PM

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[Medial_collateral_ligament_ankle_deltoid_ligament.jpg]

1. MEDIAL COLLATERAL LIGAMENT (OR DELTOID LIGAMENT) OF ANKLE :

It consists of two sets of fibers, superficial and deep. Both parts have a common attachment above to the apex and margins of the medial malleolus. The lower attachment is indicated by the name of the fibers.

Superficial fibers :

The most anterior (tibionavicular) fibers pass forward to be inserted into the tuberosity of the navicular bone, and immediately behind this they blend with the medial margin of the plantar calcaneonavicular ligament (spring ligament).
The middle (tibiocalcaneal) fibers descend almost perpendicularly to be inserted into the whole length of the sustentaculum tali of the calcaneum
The posterior fibers (posterior tibiotalar) pass backward and laterally to be attached to the medial side of the talus, and its medial tubercle.

Deep fibers :

The deep fibers (anterior tibiotalar) are attached to the anterior part of medial surface of the talus.
The deltoid ligament is crossed by the tendons of the tibialis posterior and Flexor digitorum longus.

2. LATERAL COLLATERAL LIGAMENT OF THE ANKLE :

The lateral collateral ligament has 3 discrete bands or parts:

The anterior talofibular ligament - extends anteromedially from the anterior margin of the fibular malleolus to the neck of the talus.
The posterior talofibular ligament - extends almost horizontally from the lateral malleolar fossa to the lateral tubercle of the talus.
The calcaneofibular ligament - is a long cord which passes from a depression anterior to the apex of the fibular malleolus to a tubercle on the lateral calcaneal surface. It is crossed by the tendons of the peroneus longus and brevis.

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Posted in: 3D Animation