Toe

The toes are, from medial to lateral:

Toe anatomy and physiology

The human foot consists of numerous bones and soft tissues which support the weight of the upright human. Specifically, the toes assist the human while walking, providing balance, weight-bearing, and thrust during the gait. Toe bones articulate around the metatarsal bones which make up the central portion of the human foot. The joints between bones of the toe are known as interphalangeal joints. Movements are generally instigated by way of tendons actuated by muscles in the lower leg.

The hallux (large toe) is primarily flexed by the flexor hallucis longus muscle, located in the deep posterior of the lower leg, via the flexor hallucis longus tendon. Additional flexion control is provided by the flexor hallucis brevis. It is extended by the abductor hallucis muscle and the adductor hallucis muscle. The remaining toes are primarily controlled by the flexor digitorum brevis muscle and the extensor digitorum brevis muscle. Finally, the fifth toe (the smallest toe) has a separate set of control muscles and tendon attachments, the flexor and abductor digiti minimi. Numerous other foot muscles contribute to fine motor control of the foot. The connective tendons between the minor toes accounts for the inability to actuate individual toes.

Exceptions include polydactyly (too many toes), and syndactyly or amputation (too few toes). The four smallest toes consist of three phalanx bones, while the largest consists of two phalanx bones and two sesamoid bones. Many of the flexor tendons are shared, making it impossible to move individual toes independently; however, some prehensility, or grasping capability, does exist for most humans.

Forefoot shape, including toe shape, exhibits significant variation among people; these differences can be measured and have been statistically correlated with ethnicity. Such deviations may affect comfort and fit for various shoe types. Research conducted by Freedman for the U.S. Army indicated that larger feet may still have smaller arches, toe length, and toe-breadth. Specifically measurable toe and forefoot metrics for humans include A sprain or strain where the toe joins to the foot is called turf toe. A bunion is a structural deformity of the bones and the joint between the foot and big toe, and may be painful. Long-term use of improperly sized shoes can cause misalignment of toes, as well as other orthopedic problems.

See also

*Ainhum

References

Category:Foot Category:Podiatry