Orbital Anatomy

Frontal process of maxilla Lacrimal bone Orbital plate of the ethmoid bone Body of the sphenoid bone. The anatomy of the orbit is discussed with reference to relevant orbital disease.

Right Orbit Bones Anatomie

Kashinatha Shenoy M 1 Gopalakrishna K 2 and Preetha 1.

Orbital anatomy. Orbita TA orbital cavity. The medial wall is composed of the frontal process of the maxillary bone anteriorly the lamina papyracea of the ethmoid air cells at the midportion and the sphenoid bone posteriorly. Each orbit is pear-shaped with the optic nerve representing the stem.

The orbital cavities are large bony sockets that house the eyeballs with associated muscles nerves blood vessels and fat. The orbit which protects supports and maximizes the function of the eye is shaped like a quadrilateral pyramid with its base in plane with the orbital rim. In the adult human the volume of the orbit is 30 millilitres of which the eye occupies 65 ml.

Anatomy of the eye. The orbit is a confined space bounded by four bony walls. Orbital Group Ocular Group.

Computed tomography CT is the standard diagnostic test for evaluating cross-sectional two or three-dimensional images of the body1. Medial Orbital Wall The medial wall is formed from front to back by the. Illustrations Common tendinous ring.

The orbit is conical and has a volume of about 30 cm 3. The ophthalmic artery has many branches which may be separated into 2 groups. In anatomy the orbit is the cavity or socket of the skull in which the eye and its appendages are situated.

The clinician must have a detailed knowledge of orbital anatomy to understand the structural disarrangements in orbital disease and to employ appropriate medical and surgical procedures. Arterial Supply to the Orbit Blood supply to the orbital arises primarily from the ophthalmic artery - the first branch off of the internal carotid as it emerges from the cavernous sinus on the medial side of the clinoid process. The inferior oblique muscle originates from the orbital floor lateral to the nasolacrimal duct.

Anatomy of Orbit and Clinical Aspect of Orbital Disease. The orbit is open anteriorly where it is bound by the orbital septum which forms part of the eyelids. 2 Department of Anatomy Malabar Medical College and Research Centre Modakkalur Atholi Calicut India Corresponding Author.

ANATOMY OF ORBIT SIVATEJA CHALLA SSSIHMS. DEVELOPMENT Orbit develops around the eyeball Orbital walls- derived from cranial neural crest cells which expand to form Frontonasal process Maxillary process Lateral nasal process Maxillary process medial inferior and lateral orbital walls Capsule of forebrain forms orbital roof. The orbital contents comprise the eye the orbital and retrobulbar fascia extraocular muscles cranial nerves II III IV V and VI blood vessels fat the lacrimal gland with its sac and duct the eyelids.

The cavity surrounds and provides mechanical protection for the eye and soft tissue structures related to it. The anterior orbital rim has horizontal and vertical diameters of 40 cm and 35 cm respectively. The bony orbit is a conical structure with the apex pointing posteriorly.

It has a roof floor medial and lateral wall. Seven bones conjoin to form the. The bony cavity containing the eyeball and its adnexa.

The orbital roof is composed of the frontal bone and is thinner anteriorly. The palatine the zygomatic and the maxillary bones. CT Anatomy of the orbit.

Workbook PDF of video tutorial. The medial walls of the orbit are almost parallel and border the nasal cavity anteriorly. Apart from the globe orbital fat and extraocular.

The lacrimal fossa is formed by the maxillary and lacrimal bones which contains the nasolacrimal duct. Extrinsic muscles of eyeball Fascial sheath of eyeball Tenon. By definition the orbit bony orbit or orbital cavity is a skeletal cavity comprised of seven bones situated within the skull.

Common anular tendon Zinn. The lateral walls however diverge at an angle. Orbit can refer to the bony socket or it can also be used to imply the contents.

It is formed of parts of the frontal maxillary sphenoid lacrimal zygomatic ethmoid and palatine bones. 5 Inferior orbital fissure. Medical Dictionary for the Health Professions and Nursing Farlex 2012 Want to thank TFD for its existence.

1 Department of Ophthalmology Malabar Medical College and Research Centre Modakkalur Atholi Calicut India. In the adult the orbit has a volume of approximately 30 mL of which the globe occupies 65 mL. However the orbital dimension widens posteriorly with a maximum diameter 1 cm posterior to the rim.

This chapter discusses orbital anatomy with emphasis on those aspects that are important in orbital disease. The orbital floor consists of three bones.

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