The letter B in the image below of the paranasal sinuses labels the _____ sinuses. 
Definitions:
Flexor Digitorum Longus
A muscle in the lower leg that flexes the toes and helps in walking.
Tibialis Anterior
A muscle in the lower leg that is involved in dorsiflexion and inversion of the foot.
Fibularis Brevis
A muscle located on the lateral part of the lower leg, involved in plantar flexion and eversion of the foot.
Extensor Digitorum Longus
A muscle in the leg that helps in extending the toes and dorsiflexing the foot.
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