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

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

Plate 1.14

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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