Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 1. Head and Neck

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Atlas of Human Anatomy in Cross Section: Section 1. Head and Neck

Plate 1.15

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
Peer Review Status: Externally Peer Reviewed

Upper Left Quadrant	Lower Left Quadrant	Lower Right Quadrant	Upper Right Quadrant
1. Gyrus rectus of frontal lobe 2. Tuber cinereum 3. Internal carotid a. 4. Orbital gyri of frontal lobe 5. Oculomotor nerve in cavernous sinus 6. Lesser wing of the spheroid 7. Basilar a. 8. Temporal lobe white matter 9. Basis pontis	10. Semicircular canals 11. Mastoid air cells 12. Sigmoid sinus 13. Middle cerebellar peduncle (brachium pontis) 14. Vermis of cerebellum	15. Fourth ventricle 16. Tegmentum of pons 17. Cerebellar hemisphere 18. Tentorium cerebelli 19. Petrous portion of the temporal bone 20. Auricle	21. Facial nerve 22. Amygdaloid nucleus 23. Posterior petroclinoid ligament 24. Middle cerebral a. 25. Cavernous sinus and internal carotid a. 26. Anterior petroclinoid ligament 27. Frontal sinus 28. Optic nerve 29. Longitudinal fissure

This section is through the pons (9, 16) and cerebellum (14, 17). The frontal and temporal lobes are seen. Within the calvarium, the frontal sinus (27) is seen. The lesser wing of the spheroid bone (6) and the petrous portion of the temporal bone (19) are seen. Within the petrous portion of the temporal bone (19), the mastoid air cells (11) and the semicircular canals (10) are seen. Within the dura mater, the sigmoid venous sinus (12) is seen. In the frontal lobe, the orbital gyri (4) are lateral and the gyrus rectus (1) is medial. The longitudinal (interhemispheric) fissure (29) separates the two frontal lobes. The middle cerebral artery (24) is seen within the lateral (sylvian) fissure. The amygdaloid nucleus (22) is seen within the temporal lobe (8). The anterior (26) and posterior (23) petroclinoid ligaments are seen. The internal carotid artery (3, 25) is seen within the cavernous sinus (25) and in close proximity to the optic nerve (28). The oculomotor nerve (5) is seen within the cavernous sinus (25). The tuber cinereum (2) is seen between the internal carotid arteries (3). The pons (9, 16) is connected to the cerebellum (14, 17) via the middle cerebellar peduncle (brachium pontis) (13). Within the pons, the tegmentum (16) is dorsal and the basis pontis (9) is ventral. The basilar artery (7) is ventral to the pons. The facial nerve (21) is seen exiting from the lateral surface of the pons. Within the cerebellum, the midline vermis (14) and the lateral cerebellar hemispheres (17) are seen. The fourth ventricle (15) lies between the vermis of the cerebellum (14) and the tegmentum of the pons (16). The tentorium cerebelli (18) is a dural fold between the cerebellum and occipital lobe. Outside the skull, the auricle (20) is seen.

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