Medial wall of orbit Paries medialis C

21 Anterior ethmoidal foramen. Foramen eth-moidale anterius. Anterior opening in the medial wall of the orbit between the frontal and ethmoid bones for passage of the anterior eth-moidal nerve and vessels from the anterior cranial fossa. C

22 Posterior ethmoidal foramen. Foramen eth-moidale posterius. Posterior opening in the medial wall of the orbit between the frontal and ethmoid bones for passage of the posterior eth-moidal vessels and nerve. C

22 a Lacrimal sulcus. Sulcus lacrimalis. Groove-like beginning of the nasolacrimal canal. C

22 b Fossa of lacrimal sac. Fossa sacci lacrimalis.

Expanded depression for the lacrimal sac at the beginning of the nasolacrimal canal. C

23 Superior orbital fissure. Fissura orbitalis superior. Fissure in the posterior part of the lateral wall of the orbit between the greater and lesser wings of the sphenoid. It leads from the cranial cavity to the orbit and transmits the ophthalmic, oculomotor, trochlear and abducens nerves as well as the superior ophthalmic vein. C

24 Inferior orbital fissure. Fissura orbitalis inferior. Cleft between the greater wing of the sphenoid and the orbital surface of the maxilla for passage of the zygomatic nerve and the infraorbital nerve and vessels. C

25 NORMA OCCIPITALIS. Normal outline of skull viewed from behind. B

25 a Inion. Cephalometric landmark at the center of the external occipital protuberance.

26 Lambda. Junction point of the lambdoid and sagittal sutures. B

27 CRANIAL FONTANELLES. Fonticuli cranii. Membrane-covered gaps between the developing skull bones (fetal and infant). D E

28 Anterior fontanelle. Fonticulus anterior. Rhomboid, large space located anteriorly in the sagittal suture between the temporal and frontal anlagen. It is obliterated in the 2nd and 3rd postnatal year. D E

29 Posterior fontanelle. Fonticulus posterior. Small triangular gap at the junction of the sagittal and lamboid sutures, i.e., between the paired temporal bones and the occipital bone. It closes within 3 months after birth. D E

30 Sphenoidal (anterolateral) fontanelle. Fon-ticulus sphenoidalis (anterolateralis). Lateral gap between the frontal, parietal, temporal and sphenoid bones, i.e., at the site ofthe pterion. D

31 Mastoid (posterolateral) fontanelle. Fon-ticulus mastoideus (posterolateralis). Lateral space between the parietal, occipital and temporal bones, i.e., at the site of the asterion. D

"A Lateral wall of nasal cavity with frontal and sphenoidal sinuses

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