. Cunningham's Text-book of anatomy. Anatomy. 804 THE OKG-ANS OF SENSE. the opening of the anterior ethmoidal cells, and, in rather more than fifty per cent of skulls rl continued upwards as the fronto-nasal duct into the irontal air-sinus; in the remainder it is shut off from the lower end of the ronto-nasal due by the union of the anterior nart of the bulla ethmoidal* with the upper end of the processus uncinatus, and the fronto-nasal duct then opens into the anterior part of the middle meatus. The ostium maxillare or opening of the maxillary smus is placed below the bulla ethmoidalis, and i
. Cunningham's Text-book of anatomy. Anatomy. 804 THE OKG-ANS OF SENSE. the opening of the anterior ethmoidal cells, and, in rather more than fifty per cent of skulls rl continued upwards as the fronto-nasal duct into the irontal air-sinus; in the remainder it is shut off from the lower end of the ronto-nasal due by the union of the anterior nart of the bulla ethmoidal* with the upper end of the processus uncinatus, and the fronto-nasal duct then opens into the anterior part of the middle meatus. The ostium maxillare or opening of the maxillary smus is placed below the bulla ethmoidalis, and is hidden by the lower end of the processus uncinatus; an accessory ostium is frequently seen in the middle meatus, above the posterior part of the inferior nasal concha. The inferior meatus lies below the inferior nasal concha, under cover of the anterior part of which is the slit-like orifice of the naso-lacrimal duet (see p. 82o> The roof is very narrow, except at its posterior part, and is divisible into three portions, fronto-nasal, ethmoidal, and sphenoidal, in accordance with the bones which enter into its formation. , The floor is nearly .horizontal from before backwards, and is formed by the palatine process of the maxilla and the horizontal part of the palatine bone. _ In Ft close to the inferior margin of the septum and immediately over the incisive foramen, a slight depression, the nasopalatine recess, is sometimes seen ; it is directed downwards and forwards for a short distance, and indicates the position of a communication which existed between the nasal and buccal cavities m early etMembrana Mucosa nasal mucous membrane is thick, highly vascular, and firmly bound to the subjacent periosteum and P^0^^ ^ is continuous, through the choanal, with the mucous lmmg of the nasal pait oi the pharynx; through the naso-lacrimal and lacrimal ducts, with the conjunctiva , and through the apertures leading into the air-sinuses, with the delicate lining rftKh^1*e r
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
