Eyelids and Adnexa
Contents of the Orbit: Muscles, Nerves, and Vasculature
The human orbit contains vital structures such as muscles, nerves, and blood vessels that enable eye movement, sensation, and nourishment.
Eyelids and Adnexa: Contents of the Orbit
The human orbit houses essential structures that support ocular function. These include muscles, nerves, and vasculature critical for eye movement, sensation, and nourishment.
Muscles of the Orbit
Six extraocular muscles control eye movement: the superior, inferior, medial, and lateral rectus muscles along with the superior and inferior oblique muscles. The levator palpebrae superioris elevates the upper eyelid.
Nerves of the Orbit
The optic nerve (CN II) transmits visual information, while the oculomotor (CN III), trochlear (CN IV), and abducens (CN VI) control eye movements. The trigeminal nerve (CN V) provides sensory input.
Vasculature of the Orbit
The ophthalmic artery supplies blood to the orbital structures, and the ophthalmic veins drain deoxygenated blood, preventing congestion and ensuring proper function.
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