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 1.17

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. Ethmoidal labyrinth 2. Medial rectus m. 3. Internal carotid a. 4. Anterior clinoid process 5. Eyeball 6. Lateral rectus m. 7. Trigeminal (gasserian) ganglion 8. Trigeminal nerve	9. Semicircular canals 10. Middle ear 11. Mastoid air cells 12. Auricle 13. Sigmoid sinus 14. Middle cerebellar peduncle (brachium pontis) 15. Cerebellar hemisphere 16. Dentate nucleus of cerebellum 17. Transverse sinus	18. Choroid plexus in roof of fourth ventricle 19. Confluence of sinuses (torcular herophili) 20. Vermis of cerebellum 21. Fourth ventricle 22. Dentate nucleus of cerebellum 3. Tentorium cerebelli 24. Temporal lobe	25. Pons 26. Basilar a. 27. Oculomotor nerve 28. Superior rectus m. 29. Internal carotid a. 30. Optic nerve 31. Medial rectus m. 2. Frontal sinus 33. Sphenoid sinus

This is a section through the temporal lobe and brain stem. In the orbital cavity, the following structures are seen: lateral rectus muscle (6), eyeball (5), medial rectus muscle (2, 31), and superior rectus muscle (28). The optic nerve (30) is seen behind the orbit in close proximity to the internal carotid artery (29). In the midline rostrally are the frontal (32) and spheroid (33) sinuses. The ethmoidal labyrinth (1) is seen medial to the orbit. The oculomotor nerve (27) and the trigeminal (gasserian) ganglion (7) are seen medial to the temporal lobe (24). In the posterior fossa, the cerebellum (15, 20) and pons (25) are seen. The two are connected via the middle cerebellar peduncle (brachium pontis) (14). The fourth ventricle (21) is between the pons (25) and the vermis of the cerebellum (20).

The choroid plexus (18) is seen in the roof of the fourth ventricle (21). Deep within the cerebellum are the dentate nuclei (16, 22). The basilar artery (26) lies in a groove on the ventral surface of the pons (25). The trigeminal nerve (8) exits lateral to the pons (25). The tentorium cerebelli (23) is on each side of the cerebellum. The transverse (17) and sigmoid (13) sinuses and the confluence of sinuses (19) are seen. The anterior clinoid process (4) is seen lateral to the internal carotid artery (3). The mastoid air cells (11) are seen rostral to the sigmoid sinus (13) along with the middle ear (10) and the semicircular canals (9) of the inner ear. Part of the auricle (12) is seen on one side.

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