C11.2

What are extrinsic eye muscles?

• also called extraocular muscles

• Attach to outer surface of eye; muscles that move the eyeball.

• Six muscles: four rectus and two oblique

Where do the rectus eye muscles arise from?

The common tendinous ring (annulus of Zinn)

What does the medial rectus do?

• pulls eye medially

• Innervated by CN III (oculomotor)

What does the lateral rectus do?

• pulls eye laterally

• Innervated by CN VI (abducens)

what does the superior rectus do?

• pulls eye superiorly and medially

• Innervated by CN III (oculomotor)

What does the inferior rectus do?

• pulls eye inferiorly and medially

• Innervated by CN III (oculomotor

Oblique eye muscles

• Inferior oblique

• Superior oblique

Inferior oblique

• elevates and turns eye laterally

• Innervated by CN III (oculomotor)

Superior oblique

• depresses and turns the eye laterally

• Passes through pulleylike loop, the trochlea

• Innervated by CN IV (trochlear)

muscle compartment

• A group of muscles surrounded by fascia that perform similar functions.

• Occur in the limbs

• Muscles surrounded by deep fascia and subdivided by intermuscular septa

• Each compartment composed of functionally related muscles

groin strain

• (groin pull, pulled groin)

• Injury to inner thigh muscles from sudden movement.

• Tearing, stretching, straining proximal attachments of medial muscles of thigh

• Typically occurs if muscles contract too suddenly, forcefully

• Jumping, kicking, change direction while running

Strained or pulled hamstring

• Hamstring tendons avulsed (torn away) during quick starts/stops, fast running, sudden lateral/medial stress to knee joint

• Tearing of muscles in the back of the thigh.

What is compartment syndrome?

Dangerous pressure buildup in muscles → cuts off blood flow.

Causes of compartment syndrome

• trauma (fractures, crush injurires, burns),

• prolonged exertion or intense exercise,

• casts and bandages that are too tight,

• surgery

Symptoms of compartment syndrome?

• SEVERE pain

• numbness, tingling

• weakness, swelling

• pale or shiny skin,

• inability to move the affected limb

Treatment for compartment syndrome

• fasciotomy

• Untreated, may result is severe damage to blood vessels/nerves and tissue death.

• Amputation may be required.