الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
The organization of the roots, ganglia and the distribution of the cranial nerves in the blind snake Leptotyphlops cairi, living in Egypt are examined in the serial transverse and sagittal sections. The results of this study demonstrated that the nervus terminalis arises from Jacobson’s organ. The nervi terminalis and olfactorius enter, separately, the sessile olfactory lobe. The nervi opticus, trochlearis and abducens are missing due to the absence of the functional eye. The nervus oculomotorius is poorly developed with a rudiment ciliary ganglion. The nervus trigeminus has one stout root, and two separate ganglia. The ramus nasalis anastomoses with the ramus palatinus medialis of the nervus facialis. The ramus maxillaris gives a branch which fuses with the ramus palatinus lateralis forming the infraorbital nerve innervating Harderian gland. The ramus mandibularis enters the primordial canal as the inferior alveolar nerve, where it receives the chorda tympani of the nervus facialis. The nervus facialis leaves the craninal cavity through the facial foramen to enter the geniculate ganglion which is continuous with the caudal end of the maxillomandibular ganglion. The ramus palatinus is carried by the ramus ophthalmicus profundus. The ramus hyoideus is carried with the pharyngeal-vago-accessorius nerve. The vestibular ganglion lies intracranially. The nervus glossopharyngeus leaves the cranial cavity together with the vago-accessorius root through the jugular foramen to join the petroso-jugular ganglion. The nervus vagus (ramus recurrens laryngeus and truncus vicseralis) enters the nodosal ganglion. The nervus hypoglossus arises by four roots. The ramus lingualis lateralis joins the ramus intermandibularis medius (N.V). The cervical sympathetic trunk enters the head as a medial cranial sympathetic nerve.
The relation of these nerves to each other and to the structures of the head have been described in details.Key words: Blind snakes - Leptotyphlopidae - Leptotyphlops cairi- Anatomy - Cranial nerves