. Cunningham's Text-book of anatomy. Anatomy. 806 THE OEGANS OF SENSE. the septal artery from the superior labial. The maxillary sinus is partly supplied by the infra- orbital artery, whilst the sphenoidal sinus gets its chief supply from the spheno-palatine artery. The veins form a dense cavernous plexus ; this condition is well seen in the respiratory region, and especially so over the middle and inferior nasal conchas and on the lower part of the septum. The venous blood is carried in three chief directions, viz., anteriorly into the anterior facial vein, posteriorly into the spheno-palatin
. Cunningham's Text-book of anatomy. Anatomy. 806 THE OEGANS OF SENSE. the septal artery from the superior labial. The maxillary sinus is partly supplied by the infra- orbital artery, whilst the sphenoidal sinus gets its chief supply from the spheno-palatine artery. The veins form a dense cavernous plexus ; this condition is well seen in the respiratory region, and especially so over the middle and inferior nasal conchas and on the lower part of the septum. The venous blood is carried in three chief directions, viz., anteriorly into the anterior facial vein, posteriorly into the spheno-palatine vein, and superiorly into the ethmoidal veins. The ethmoidal veins communicate with the ophthalmic veins and the veins of the dura mater ; further, an ethmoidal vein passes up through the lamina cribrosa of the ethmoid, and opens either into the venous plexus of the olfactory bulb or directly into one of the veins on the orbital surface of the frontal lobe of the brain. The lymph vessels form an irregular network in the superficial part of the mucous membrane, and can be injected from the subdural or subarachnoid cavities. The larger vessels are directed posteriorly towards the choanae, and are collected into two trunks, of which the larger passes to a lymph gland in front of the epistropheus, and the smaller to one or two lymph glands situated near the greater cornu of the hyoid bone. The development of the nose is described in the section which deals with " General Embryology " (p. 50). ORG-ANON VISUS. OCULUS. The bulb of the eye ( eyeball) constitutes the peripheral part of the organ of sight; associated with it are certain accessory structures, such as the eyelids and the lacrimal apparatus. Sinus venosus scleras— Suspensory ligament-— Lens Tendon of lateral—-fa rectus Anterior chamber Iris Posterior chamber Ciliary process Spatia zonularia Tendon of medial rectus Equator— Vitreous body Optic axis. Vitreous body 8 \~\ Y^'-'i'- opu. jL— Lamina cribr
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