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 1.19

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. Nasal septum 2. Nasal cavity\| 3. Sphenoid sinus 4. Sclera 5. Lens 6. Internal carotid a. 7. Lateral rectus m. 8. Trigeminal (gasserian) ganglion in Meckel's cave 9. Temporal lobe 10. Temporalis m. 11. Cochlea 12. Auditory ossicle, malleus 13. Vestibulocochlear nerve, cochlear component 14. Bony labyrinth, vestibule	15. Vestibulocochlear nerve, vestibular component 16. Bony labyrinth, semicircular canals 17. Middle ear 18. Pinna, elastic cartilage 19. Sigmoid sinus 20. Vagus and glossopharyngeal nerves 21. Occipital a. and v. 22. Restiform body (inferior cerebellar peduncle) 23. Fourth ventricle	24. Medulla oblongata 25. Cerebellum 26. Medullary pyramid 27. Internal jugular v. 28. Mastoid air cells 29. Internal jugular v. 30. Internal auditory meatus	31. Internal carotid a. 32. Mandibular process 33. Superficial temporal a. 34. Temporal bone, zygomatic process 35. Internal carotid a. 36. Ethmoid labyrinth

This is a section (looking down) through the orbit, nasal cavity, inferior part of the temporal lobe, and the posterior cranial fossa. In the midline rostrally is the nasal septum (1) in the middle of the nasal cavity (2). The ethmoid labyrinth (36) is in the lateral wall of the nasal cavity (2). Caudal to the nasal cavity is the spheroid sinus (3). Within the orbital cavity, the following structures are seen: the lateral rectus muscle (7), lens (5), and sclera (4). The temporal lobe (9) is in the middle cranial fossa. Medial to the temporal lobe (9) is the trigeminal (gasserian) ganglion in Meckel's cave (8). The internal carotid artery (6) is seen medial to the trigeminal ganglion (8). In the posterior cranial fossa, the cerebellum (25) and the medulla oblongata (24) are seen. Between the cerebellum (25) and the medulla oblongata (24) is the fourth ventricle (23). Within the medulla oblongata (24), the medullary pyramid (26) is ventral and the inferior cerebellar peduncle (restiform body) (22) is dorsolateral. The vagus and glossopharyngeal nerves (20) exit from the lateral surface of the medulla oblongata (24). The vestibule (14), semicircular canals (16), and cochlea (11) are seen in the bony labyrinth. The malleus (12) is seen within the middle ear (17). The vestibular (15) and cochlear (13) components of the vestibulocochlear nerve are seen within the internal auditory meatus. Major vascular structures seen in the section are the internal carotid artery (6, 31, 35), internal jugular vein (27, 29), and sigmoid sinus (19). Other structures seen in the section are the pinna (18), internal auditory meatus (30), zygomatic process of temporal bone (34), superficial temporal (33) and occipital (21) arteries, occipital vein (21), mastoid air cells (28), temporalis muscle (10), and mandibular process (32).

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