Tibialis anterior muscle
| Tibialis anterior muscle |
|---|
|
| Human lower leg muscles from the front |
| origin |
| Lateral condyle of the tibia , interosseous membrane |
| approach |
| Plantar surface of the medial cuneiform , the base of the metatarsal I |
| function |
| Lifts the foot (dorsiflexion) and especially the inner edge of the foot (supination) |
| Innervation |
| Deep peroneal nerve |
| Spinal segments |
| L4, L5 |
The tibialis anterior muscle ( Latin for "anterior tibial muscle "), known in domestic mammals as the tibialis cranialis muscle , runs on the outside of the leg next to the shin and ends just before the ankle . The German term "Fußifte" describes its main function. It ends in a tendon that is deflected by the ligaments of the ankle and ends on the inside of the foot, approximately in the middle of the arch of the foot.
Innervation
The M. tibialis anterior is innervated by the Nervus fibularis (peroneus) profundus , which receives its fibers from the nerve roots L4 and L5 via the Nervus common peroneus , Nervus ischiadicus and Plexus lumbosacralis .
Vascular supply
The muscle is supplied with arterial blood from the anterior tibial artery .
function
The tibialis anterior muscle pulls the foot up on the free leg (and at the same time tilts it outwards; supination ), on the standing leg it ensures that the shin is pulled down. This causes the body to fall into the next step while walking. On unfamiliar, long marches, it is the first muscle to tire, which is why you finally begin to “trip over your own feet”. Paralysis of the tibialis anterior muscle leads to the so-called stepper gait . When walking, running and jumping, the tibialis cushions the heel touchdown by pulling it forward and reacting elastically when it touches down.
The tibialis anterior and peroneus longus muscles also together form what is known as the “stirrup”. The name comes from the fact that they enclose the foot like a stirrup from the medial (inside) the tibialis anterior muscle and from the lateral (outside) the peroneus longus muscle.
Antagonists
Opponents are the muscles of the dorsal compartment: the gastrocnemius muscle and the soleus muscle .
See also
Picture gallery
Bones with muscle attachments of the right leg, front view.
Bones of the right foot with muscle attachments, bottom view (from the plantar side ).
Section through the middle of the lower leg.
Tendon sheaths around the ankle, medial view.
Tendon sheaths around the ankle, lateral view.
