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Nov 3, 2023 · The apex of the orbit is the optic foramen (canal), bound medially by the body of the sphenoid bone and laterally by the lesser wing of the sphenoid bone. It is medial to the superior orbital fissure. The optic foramen provides passage for the optic nerve (CN II) and ophthalmic artery to exit the skull.
- Maxillary Sinus
The maxillary sinus is the largest paranasal sinus situated...
- Lacrimal Apparatus
Lacrimal artery (lateral-left view) The facial nerve leaves...
- Eyes
Bony cavity within the skull that houses the eye and its...
- Maxillary Sinus
- Bones of The Orbit
- Whitnall's Tubercle
- Nasolacrimal Duct
- Fissures
- Sample Questions
There are 7 bones that make up the orbit (in no particular order): 1. Ethmoid 2. Lacrimal 3. Frontal 4. Sphenoid 5. Maxillary 6. Palatine 7. Zygomatic Check out our article on the orbital bonesfor more details.
Whitnall's tubercle is a prominence along the zygomatic bone. It serves as the attachment for several key soft-tissue structures (the "4 L's"): 1. Lateral rectus check ligament 2. Lateral palpebral ligament 3. Lockwood suspensory ligament 4. Levator aponeurosis Please see our article on Whitnall's tuberclefor more detailed information. **Note: Whit...
The nasolacrimal duct originates at the lacrimal fossa and drains into the inferior meatus.In dacryocystorhinostomy, the nasolacrimal duct is bypassed and a new drainage opening (ostomy) is formed between the lacrimal sac and the middle meatus.Superior Orbital Fissure
The superior orbital fissure contains many key structures. They are typically organized into structures above the annulus of Zinn and those within the annulus of Zinn. One of the many reasons why these distinctions are important is because retrobulbar blocks are theoretically intraconal; therefore, structures within the annulus of Zinn will be affected by the block, whereas structures outside the annulus will not.
Structures ABOVE the annulus of Zinn:
1. Lacrimal nerve (branch of CN V1) 2. Frontal nerve (branch of CN V1) 3. Trochlear nerve (CN IV) 4. Superior ophthalmic vein
Structures WITHIN the annulus of Zinn:
1. Oculomotor nerve (CN III, superior and inferior divisions) 2. Nasociliary nerve (branch of V1) 3. Sympathetic nerves 4. Abducens nerve (CN VI)
Which of the following bones is part of the orbital floor? A. Frontal bone B. Ethmoid bone C. Palatine bone D. Sphenoid boneWhich orbital wall does NOT contain the sphenoid bone? A. Orbital roof B. Lateral orbital wall C. Orbital floor D. Medial orbital wallWhich of the following structures does NOT attach to Whitnall's tubercle? A. Lateral rectus check ligament B. Superior transverse ligament C. Inferior suspensory ligament D. Lateral palpebral l...Which of the following structures lies outside the annulus of Zinn? A. Oculomotor nerve (CN III) B. Frontal nerve (CN V1) C. Nasociliary nerve (CN V1) D. Sympathetic nervesFeb 20, 2024 · The orbital bones join to form the orbit or socket of the eye, where the eyeball rests. The orbital structure provides pathways for the eye to connect with the nerves, lacrimal apparatus, adipose tissues, blood vessels, and extraocular muscles. This enables the eye to move and function properly. 1 It also protects the eye from injury in case of ...
- Medical Content
- 18 min
- Bones of the orbit. The bony orbit is made out of seven bones, which include the maxilla, zygomatic bone, frontal bone, ethmoid bone, lacrimal bone, sphenoid bone and palatine bone.
- Eyelid anatomy. The eyelids are soft tissue structures that cover and protect the anterior surface of the eyeball. The anatomy of the eyelid may seem complex, but if we dissolve its multi-layered structure it is actually quite simple
- Lacrimal gland. The lacrimal gland is a part of the lacrimal apparatus, which besides the gland consists of its numerous ducts, the lacrimal canaliculi, lacrimal sac and nasolacrimal duct.
- Eye muscles. There are two groups of eye muscles: Extraocular muscles that move the eyeballs within the orbit. Intrinsic ocular muscles which are within the eyeball itself and control how the eyes accommodate.
Apr 29, 2023 · The eye sits in a protective bony socket called the orbit. Six extraocular muscles in the orbit are attached to the eye. These muscles move the eye up and down, side to side, and rotate the eye. The extraocular muscles are attached to the white part of the eye called the sclera. This is a strong layer of tissue that covers nearly the entire ...
Dec 22, 2022 · The orbital cavity, also known as the orbit, is a bony socket located within the skull that houses and protects the eye and its associated structures. It is an important and complex structure in the human body, playing a vital role in vision and eye movement. Structure The orbital cavity is a four-walled, pyramid-shaped structure.
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Diagram of eye with surrounding superior, oblique, medial and inferior rectus muscles; supraorbital foramen shown above the eye, and inferior orbital fissure inferolaterally. In anatomy, the orbit is the cavity or socket/hole of the skull in which the eye and its appendages are situated. "Orbit" can refer to the bony socket, [ 1 ] or it can ...
