Muscle Flexion and Extension Mechanics

Flashcards covering key concepts of muscle flexion and extension mechanics related to foot musculature.

Flexion MP

Movement at the metatarsophalangeal joint that decreases the angle between the bones; range of motion (Rom): 0-45.

Lumbricales

Muscles involved in toe flexion, innervated by the Tibial Nerve.

Flexion Hallucis Brevis

Muscle that flexes the big toe, innervated by the Tibial Nerve.

Limited Movement Causes

Tension in extension muscles and contact with soft parts can limit flexion movement.

Weakness Effects

Hyperextension can lead to hammer toe position; decreased muscle support affects the transverse arch.

Flexion IP

Flexion at the interphalangeal joint; range of motion (Rom): 50-90.

Flexion Digitorium Longus

Muscle that flexes the toes, innervated by the Tibial Nerve.

Extension MP Hallux

Extension movement at the metatarsophalangeal joint of the big toe; range of motion (Rom): 0-70.

Extension Digitorium Longus

Muscle that extends the toes, innervated by the Deep Peroneal Nerve.

Flexible Extension Limitations

Tension in flexion muscles and tension in plantar ligaments can limit extension.

Innervation Summary

All flexion muscles are innervated by the Tibial Nerve; all extension muscles are innervated by the Deep Peroneal Nerve.

Lateral 4 Movement

Refers to the fourth toe where movement is limited with an Rom of 0-40.