Fibularis brevis
Encyclopedia
The peroneus brevis muscle (or fibularis brevis) lies under cover of the peroneus longus, and is a shorter and smaller muscle. It is also innervated by the superficial fibular (peroneal) nerve. The muscle acts in plantarflexion
and eversion
of the foot.
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.
) and "Peroneus" (i.e., Longus and Brevis) are derived from the Greek word Perone 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.
Plantarflexion
Plantarflexion is the movement which increases the approximate 90 degree angle between the front part of the foot and the shin, as when depressing an automobile pedal...
and eversion
Eversion (kinesiology)
Eversion is the movement of the sole of the foot away from the median plane. It occurs at the subtalar joint.Peroneus longus and peroneus brevis evert. Both muscles are innervated by the superficial fibular nerve....
of the foot.
Origin and insertion
It arises from the lower two-thirds of the lateral surface of the body of the fibula; medial to the Peronæus longus; and from the intermuscular septaSeptum
In anatomy, a septum is a wall, dividing a cavity or structure into smaller ones.-In human anatomy:...
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
Trochlear process
The two oblique grooves of the lateral surface of the calcaneus are separated by an elevated ridge, or tubercle, the trochlear process , which varies much in size in different bones.Its chief anatomical significance is as a point of divergence of the previously common pathway shared by the...
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.
Terminology
The terms "Peroneal" (i.e., Artery, RetinaculumRetinaculum
Occurs where in some places, groups of tendons from separate muscle pass under a band of connective tissueRetinaculum, from the Latin verb retinere , plural: retinacula may be:* In the wrist:** Flexor retinaculum of the hand...
) and "Peroneus" (i.e., Longus and Brevis) are derived from the Greek word Perone meaning pin of a brooch
Brooch
A brooch ; also known in ancient times as a fibula; is a decorative jewelry item designed to be attached to garments. It is usually made of metal, often silver or gold but sometimes bronze or some other material...
or a buckle
Buckle
The buckle or clasp is a device used for fastening two loose ends, with one end attached to it and the other held by a catch in a secure but adjustable manner. Usually overlooked and taken for granted, the invention of the buckle has been indispensable in securing two ends before the invention of...
. In medical terminology, both terms refer to being of or relating to the fibula or to the outer portion of the leg.