Anatomy Of The Eyelid

A On the outside of the eyelid is skin which meets the palpebral also known as the tarsal conjunctiva E at the lid margin B. Overview of External Anatomy The eyelids comprise of an upper and lower eyelid joined at the medial and lateral canthi.

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Eyelid skin is the thinnest in the body.

Anatomy of the eyelid. From an anatomical point of view the eyelid consists primarily of skin underlying soft tissue also called a subcutaneous tissue and a thin layer of muscle called the orbicularis oculi. When you blink the eyelids also help spread tears over the surface of your eye keeping the eye moist and comfortable. The eyelids comprise of an upper and lower eyelid joined at the medial and lateral canthi.

The upper and lower eyelids along with the upper and lower puncta oppose the globe. The Orbicularis oculi Orbicularis palpebrarum Fig. An eyelid is a thin fold of skin that covers and protects an eyeThe levator palpebrae superioris muscle retracts the eyelid exposing the cornea to the outside giving vision.

The human eyelid features a row of eyelashes which serve to heighten the protection of. At Whitnall ligament it splits into the levator aponeurosis blue and the superior tarsal Müller muscle green which inserts at the superior border of the tarsus. GROSS ANATOMY 1EXTENT AND POSITION OF EYELIDS Upper eyelid extends from eyebrow to superior boundary of palpebral fissure Lower eyelids inferior boundary of palpebral fissure to merge into cheeks In primary postion upper lid covers one sixth of cornea and lower lid just touches cornea.

The human eyelid features a row of eyelashes along the eyelid margin which serve to heighten the protection of the eye from dust and foreign debris as well as from. Asians do not have this attachment and thus do not have superior eyelid folds. The upper and lower eyelids meet at an angle of approximately 60 degrees medially and laterally.

The eyelid is composed of several layers as shown in the cross-sectional view in the image above. An eyelid is a thin fold of skin that covers and protects an eye. The levator palpebrae superioris red has firm attachments to anterior aspect of the tarsus approximately 3 mm superior to the eyelid margin.

With the exception of the prepuce and the labia minora it has the thinnest skin of the whole body. Skin and subcutaneous tissue. The lower lid extends below the inferior orbital rim to join the cheek forming folds.

Skin and Subcutaneous Tissue. Understanding these relationships is essential in eyelid surgery. The understanding of periorbital structures and their interrelationships continues to evolve and requires consideration when pe.

The eyelid consists of five main layers superficial to deep. The eyelids provide globe protection contribute to tear production and distribute tears. Surgical Anatomy of the Eyelids Slight alterations in the intricate anatomy of the upper and lower eyelid or their underlying structures can have pronounced consequences for ocular esthetics and function.

Under this muscle are other issues that divide the area into different planes. The upper eyelid extends superiorly to the eyebrow which separates it from the forehead. The adjacent forehead and midface influence correct eyelid positioning.

The average aperture of the eyelids measures about 30 mm in horizontal width and approximately 10 mm in vertical height. Free Powerpoint Templates ANATOMY OF EYELID. It contains cilia sebaceous glands and sweat glands.

379 arises from the nasal part of the frontal bone from the frontal process of the maxilla in front of the lacrimal groove and from the anterior surface and borders of a short fibrous band the medial palpebral ligament. The levator palpebrae superioris LPS is the only muscle involved in raising the superior eyelid. Layers of the Eyelid.

The eyelids serve to protect the eye from foreign matter such as dust dirt and other debris as well as bright light that might damage the eye. This can be either voluntarily or involuntarily. The lower eyelid margin usually rests at the inferior corneal limbus or just slightly above it.

Responsible for superior eyelid movement Levator palpebrae superioris. Impulses for closing come by way of the facial seventh cranial nerve and for opening by way of the oculomotor third cranial nerve. The superior eyelid fold is formed by attachments from the levator aponeurosis.

These are called septum and include the fibrous orbital septum and tarsi. In this chapter eyelid anatomy is discussed in a layered structural fashion. A brief discussion of the embryology and surface topography is reviewed and the anatomy of the eyelid is then discussedbeginning with the skin anteriorly and proceeding to the conjunctiva posteriorly.

Before a clinical assessment is explained we briefly look at the normal anatomy of a lid. Embryology and Anatomy of the Eyelid Edward H. The layer of skin is among the thinnest in the human body.

In this article we shall look at the anatomy of the extraocular muscles their attachments innervation and actions. The skin and subcutaneous tissue form the most superficial layer of the eyelid. In primary position of gaze the upper eyelid margin lies at the superior corneal limbus in children and 15 to 20 mm below it in the adult.

The surgical anatomy of the eyelid is one of the most complex in the head and neck and a thorough understanding of the intricacies is paramount for facial plastic surgeons. The eyelid functions to provide lubrication to the cornea while also serving as a barrier to foreign bodies.

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