Fibularis brevis: Difference between revisions
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==Structure== |
==Structure== |
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It arises from the lower two-thirds of the lateral surface of the body of the [[fibula]]; medial to the |
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 [[Septum|septa]] separating it from the adjacent muscles on the front and back of the leg. |
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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. |
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. |
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It then runs forward on the lateral side of the [[calcaneus]], above the [[trochlear process]] and the tendon of the |
It then runs forward on the lateral side of the [[calcaneus]], above the [[trochlear process]] and the tendon of the peroneus longus, and is inserted into the tuberosity at the base of the fifth [[metatarsal]] bone, on its lateral side. A small clinical important point is that when the base of the fifth metatarsal is fractured, the peroneus brevis may pull on and displace the proximal fragment. (See Jones Fracture) |
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===Innervation=== |
===Innervation=== |
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It is also innervated by the superficial fibular (peroneal) nerve. |
It is also innervated by the superficial fibular (peroneal) nerve. |
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==Function== |
==Function== |
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Revision as of 10:14, 12 July 2015
| Peroneus brevis muscle | |
|---|---|
 Coronal section through right talocrural and talocalcaneal joints. (Label for Peroneus brevis is at right, third from the bottom.) | |
 The mucous sheaths of the tendons around the ankle. Lateral aspect. (Peroneus brevis labeled at bottom left.) | |
| Details | |
| Origin | Lower two-thirds of lateral fibula |
| Insertion | Fifth metatarsal |
| Artery | Fibular artery (peroneal artery) |
| Nerve | Superficial fibular nerve |
| Actions | Plantarflexion, eversion |
| Identifiers | |
| Latin | Musculus fibularis brevis, musculus peronaeus brevis |
| TA98 | A04.7.02.042 |
| TA2 | 2653 |
| FMA | 22540 |
| Anatomical terms of muscle | |
The peroneus brevis muscle (or fibularis brevis) lies under cover of the peroneus longus, and is a shorter and smaller muscle.
Structure
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 peroneus longus, and is inserted into the tuberosity at the base of the fifth metatarsal bone, on its lateral side. A small clinical important point is that when the base of the fifth metatarsal is fractured, the peroneus brevis may pull on and displace the proximal fragment. (See Jones Fracture)
Innervation
It is also innervated by the superficial fibular (peroneal) nerve.
Function
The muscle assists in weak plantarflexion and eversion of the foot.
History
Etymology
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.
Additional images
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Bones of the right leg. Anterior surface. -
Bones of the right foot. Dorsal surface. -
Muscles of the front of the leg. -
Cross-section through middle of leg. -
The popliteal, posterior tibial, and fibular arteries. -
Back of left lower extremity. -
Fibularis brevis muscle -
Muscles of the sole of the foot. -
Dorsum of Foot. Deep dissection. -
Musclea of Leg. Lateral view. Deep dissection.
See also
References
This article incorporates text in the public domain from page 487 of the 20th edition of Gray's Anatomy (1918)
External links
- . GPnotebook https://www.gpnotebook.co.uk/simplepage.cfm?ID=20250702.
{{cite web}}: Missing or empty|title=(help) - Anatomy photo:15:st-0407 at the SUNY Downstate Medical Center
- PTCentral