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 1.14

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. Internal carotid a. 2. Frontal sinus 3. Internal carotid a. 4. Orbital gyrus of frontal lobe 5. Oculomotor nerve 6. Posterior petroclinoid ligament 7. Amygdaloid nucleus	8. Tentorium cerebelli 9. Auricle 10. Cerebellar hemisphere 11. Middle cerebellar peduncle (brachium pontis) 12. Fourth ventricle	13. Vermis of cerebellum 14. Cisterna magna 15. Semispinalis capitis m. 16. Tegmentum of pons 17. Sigmoid sinus 18. Mastoid air cells 19. Petrous portion of temporal bone	20. Trigeminal nerve 21. Basis pontis 22. Temporal lobe 23. Abducens nerve 24. Middle cerebral a. 25. Anterior petroclinoid ligament 26. Orbital port of frontal lobe 7. Basilar a. 28. Optic nerve 29 Gyrus rectus of frontal lobe 30. Falx cerebri

This is a section (looking down) through the frontal and temporal lobes, the pons, and the cerebellum. The frontal lobe is in the anterior cranial fossa, the temporal lobe is in the middle cranial fossa, and the cerebellum and pons are in the posterior cranial fossa. The falx cerebri (30) is seen in the interhemispheric fissure between the two frontal lobes (4). The orbital part of the frontal lobe (4, 26) and the gyrus rectus (29) are seen. The frontal sinus (2) is seen on the left side. Within the temporal lobe (22), the amygdaloid nucleus (7) is seen. Branches of the middle cerebral artery (24) are in the lateral (sylvian) fissure. Caudal to the frontal lobe (4) are the optic nerve (28) and the internal carotid artery (1, 3). The oculomotor nerve (5) is adjacent to the internal carotid artery (3). Caudal to the temporal lobe (22) is the petrous portion of the temporal bone (19) and the mastoid air cells (18). The sigmoid sinus (17) is seen within the dura. The tentorium cerebelli (8) is continuous with the posterior (6) and anterior (25) petroclinoid ligaments. In the posterior fossa, the cerebellum (10, 13) and pons (16, 21) are seen. The two are connected via the middle cerebellar peduncle (brachium pontis) (11). The trigeminal nerve (20) leaves the lateral surface of the pons, and the abducens nerve (23) leaves the ventral surface of the pons. The basilar artery (27) is ventral to the pons. The fourth ventricle (12) is between the pons and cerebellum. The cisterna magna (14) is caudal to the cerebellum. Outside the cranial cavity, the auricle (9) and the semispinalis capitis muscle (15) are seen.

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