What part of the body is affected by the M levator Palpebrae Superioris?

The function of the levator palpebrae superioris muscle is to raise the upper eyelid and to maintain the upper eyelid position. The levator palpebrae superioris muscle origin is the periosteum of the lesser wing of the sphenoid bone, superior to the optic foramen.

What does the levator aponeurosis do?

The levator aponeurosis transmits the force of the levator muscle to lift the upper eyelid. Any dehiscence, disinsertion, or stretching of the levator aponeurosis, either congenital or acquired, can lead to ptosis.

What nerve is damaged in ptosis?

Oculomotor Nerve (Cranial Nerve III) Ptosis (a droopy eyelid) and diplopia are the hallmark symptoms of third nerve palsies. Disruption may occur at any location along the path of the nerve and subsequent paresis may occur in any muscle or combination of muscles innervated by the oculomotor nerve.

What causes ptosis after trauma?

Traumatic ptosis is caused by an injury to the eyelid—either due to an accident or other eye trauma. This injury compromises or weakens the levator muscle.

What is the action of the orbicularis oculi?

The orbicularis oculi muscle closes the eyelids and assists in pumping the tears from the eye into the nasolacrimal duct system. The orbital section of the orbicularis oculi is more involved in the voluntary closure of the eyelid, such as with winking and forced squeezing.

What type of muscle is the orbicularis oculi?

sphincter muscle
Orbicularis oculi—The orbicularis oculi muscle is a sphincter muscle of the eyelids. It is a broad and flat muscle spreading into three regions. A sphincter muscle closes circumferentially.

What is the action of the levator palpebrae superioris quizlet?

The levator palpebrae superioris muscle elevates and retracts the upper eyelid.

How do you test for levator palpebrae superioris?

The examiner is positioned 2–3 feet in front of the patient’s face to allow for clear observation of the patient’s eyes. The patient is instructed to tightly squeeze his or her eyelids shut for five to ten seconds. This not only relaxes the levator palpebrae superioris but actively inhibits it.

What nerve innervates the levator Palpebrae Superioris?

oculomotor nerve
Background: The levator palpebrae superioris muscle (LPS) acts as the upper eyelid’s major elevator and retractor and is innervated by the oculomotor nerve. The muscle’s paralysis is manifested by ptosis.

What is the orbicularis oculi muscle?

Introduction. The orbicularis oculi muscle is a muscle located in the eyelids. It is a sphincter muscle arranged in concentric bands around the upper and lower eyelids. The main function of the orbicularis oculi muscle is to close the eyelids.

What causes acquired ptosis?

WHAT CAUSES ACQUIRED PTOSIS? Acquired ptosis can be caused by neurologic conditions that affect the nerves and/or muscles of the eye. These include myasthenia gravis, progressive external ophthalmoplegia, Horner syndrome, and third cranial nerve palsy.

What is ptosis a symptom of?

In some cases, droopy eyelid is caused by more serious conditions, such as a stroke, brain tumor, or cancer of the nerves or muscles. Neurological disorders that affect the nerves or muscles of the eyes — such as myasthenia gravis — can also lead to ptosis.

What is levator palpebrae superioris ptosis?

Levator palpebrae superioris is a skeletal muscle of the face that is responsible for elevating and retracting the superior (upper) eyelid. Injury or dysfunction in levator palpebrae superioris or the oculomotor nerve (C3) which innervates it often results in ptosis, or marked drooping of the upper eyelid.

Where is the levator palpebrae superioris muscle?

Levator palpebrae superioris muscle (Musculus levator palpebrae superioris) Levator palpebrae superioris is a thin muscle located in the bony orbit above the eyeball. Based on its functions, it is classified into two groups of head muscles;

What is levlevator palpebrae superioris?

Levator palpebrae superioris is a triangular muscle that extends along the roof of the orbit, from the apex of orbit to the superior eyelid. It originates with a short and narrow tendon from the inferior aspect of the lesser wing of sphenoid bone, superior and anterior to the common tendinous ring.

What is the levator aponeurosis?

Levator Muscle. As discussed in the chapter on upper lid blepharoplasty ( Chapter 10 ), the levator aponeurosis lies immediately deep to the preaponeurotic (central) eyelid fat pad and fuses with the orbital septum prior to inserting on the anterior aspect of the tarsal plate and pretarsal fascia.